CN104967824B - Image delivery system based on quantum ghost image and single-mode fiber - Google Patents

Abstract

The invention discloses an image transmission system based on quantum ghost image and single-mode optical fiber. The invention utilizes the characteristic that the optical fiber channel has little perturbation to the photon frequency, and distributes the frequency-related two-photons in the optical fiber channel over a long distance, and through the associated The conversion of degrees of freedom realizes the long-distance transmission of images using fiber optic channels. It solves the problem that traditional quantum ghost images based on photon spatial momentum or spatial position-related photons are difficult to transmit in single-mode optical fibers that only support a single spatial mode, so it is impossible to use single-mode optical fiber channels to achieve long-distance image transmission. In addition, due to the use of quantum states, the physical principles of quantum mechanics can be used to ensure the security of quantum images.

Description

Image transmission system based on quantum ghost image and single-mode optical fiber

technical field

The invention belongs to the field of quantum information, and more specifically relates to an image transmission system based on quantum ghost image and single-mode optical fiber.

Background technique

Quantum information science and technology utilizes the basic principles of quantum mechanics to achieve functions that are difficult to achieve with traditional information technology. Quantum ghost imaging uses the quantum correlation between photons to realize the imaging of objects. It is a technology with rich physical principles and application potential in the field of quantum information.

In quantum ghosting, a quantum light source is first used to generate two photons with spatial entanglement or correlation properties. One of the photons illuminates the object and is detected by a single-point detector. Another photon is sent to an array of spatially resolving single-photon detectors separated from the object. Due to the spatial quantum entanglement/correlation property between two photons, the photon that irradiates the object arrives at the object and the other photon arrives at the detector. The image of the object is recovered from the consistent detection results of the single-photon detector array with spatial resolution capability. The novelty of quantum ghost images is that the detectors that record the photons that irradiate the object are single-point detectors that do not have spatial resolution, while the photons detected by the array of single-photon detectors that have a certain spatial resolution do not irradiate the object, but can On the non-irradiated object side, the image of the object is obtained by using the coincidence count measurement of the two. If a specific image is used as the object to be imaged, the principle of quantum ghost image can be used for image transmission.

At present, the optical fiber communication network has been widely laid and utilized, and the optical communication technology by means of the optical fiber communication network has also developed very maturely. However, although the principle of quantum ghosting has the potential to be used for quantum image transmission, since the spatial momentum/position entanglement that traditional quantum ghosting schemes rely on cannot be maintained in single-mode optical fibers, this quantum ghosting principle cannot be relied on. The long-distance implementation of single-mode optical fiber lines that have been widely laid limits the application of the quantum ghost image principle in long-distance image transmission technology.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is how to realize the transmission of long-distance images based on the quantum ghost image principle.

(2) Technical solution

In order to solve the above-mentioned technical problems, the present invention provides an image transmission system based on quantum ghost image and single-mode optical fiber, characterized in that the system includes:

a quantum light source for generating frequency correlated first photons and second photons;

The image sending module is connected to the quantum light source through a single-mode optical fiber, and receives the first photon emitted by the quantum light source; the image sending module includes a first spatial dispersion element and a first single-photon detector, and the first A photon is processed by the first spatial dispersion element, and is emitted to different directions according to different frequencies to irradiate the object; the first single-photon detector detects the first photon reflected or transmitted by the object to obtain the first photon a detection time;

The image receiving and processing module is connected to the quantum light source through a single-mode optical fiber, connected to the image sending module through a communication channel, and receives the second photon emitted by the quantum light source and the first photon sent by the image sending module. One detection time; the image receiving and processing module includes a second spatial dispersion element, a single photon detector array and a processor; the second photon is processed by the second spatial dispersion element and emitted to different directions according to different frequencies , and is detected by a single-photon detector at a corresponding position in the single-photon detector array to obtain a second detection time; the processor obtains a plurality of first detection times, a plurality of second detection times according to coincidence measurements The detection time and the position information of the corresponding multiple single-photon detectors in the single-photon detector single-photon detector array for measuring the multiple second detection times are calculated by coincidence to obtain an image of the object.

Preferably, the image sending module also includes an optical circulator, a fiber collimator and a focusing lens;

The first photon enters the fiber collimator through the optical circulator, and enters the first spatial dispersion element after being collimated, and the first photon emitted by the first spatial dispersion element passes through the After the focusing lens is irradiated onto the object; the first photon reflected by the object passes through the focusing lens, the first spatial dispersion element, the optical fiber collimator and the optical circulator in sequence, and is injected into the optical circulator by the optical circulator The first single photon detector.

Preferably, the image sending module further includes an optical fiber collimator, a focusing lens, and an optical fiber collecting device;

The first photons are injected into the fiber collimator, collimated and then injected into the first spatial dispersion element, and the first photons emitted by the first spatial dispersion element are irradiated to the object after passing through the focusing lens Above; the first photon transmitted by the object is collected by the optical fiber collecting device and then injected into the first single photon detector.

Preferably, the image receiving and processing module further includes a fiber collimator, and the second photons are injected into the second spatial dispersion module after being collimated by the fiber collimator.

Preferably, the quantum light source includes a pump light source and a nonlinear optical element excited by the pump light source to generate the first photon and the second photon.

Preferably, the nonlinear optical element is a crystal that produces a second-order parametric down-conversion effect or a nonlinear optical waveguide that produces a third-order spontaneous four-wave mixing effect.

Preferably, the crystals producing the second-order parametric down-conversion effect are nonlinear optical crystals of various non-centrosymmetric lattice structures, periodically poled lithium niobate crystals, periodically poled lithium niobate waveguides, gallium arsenide and phosphorus Indium and other semiconductor materials with a non-centrosymmetric lattice structure.

The nonlinear optical waveguide generating the third-order spontaneous four-wave mixing effect is a silica fiber, a sulfide glass fiber, a silicon waveguide or a gallium nitride waveguide;

The pumping light source is a pulsed pumping light source or a continuous pumping light source.

Preferably, the second spatial dispersion element is a diffraction grating, a blazed grating, a prism or a spatial light modulator;

The first single photon detector is a single photon detector based on an avalanche diode or a single photon detector based on a superconducting nanowire;

The single photon detector array is a silicon single photon detector array, an indium phosphorus/indium gallium arsenide phosphorus single photon detector array, an electron multiplying charge coupler or a superconducting nanowire single photon detector array.

Preferably, the image reception processing module is replaced by an image reception delay processing module;

The image receiving delay processing module is connected to the quantum light source through a single-mode optical fiber, connected to the image sending module through a communication channel, and receives the second photon emitted by the quantum light source and the second photon sent by the image sending module. The first detection time; the image receiving delay processing module includes a time dispersive element, a second single photon detector and a processor; the second photon is processed by the time dispersive element, and is processed for different times according to different frequencies After a time delay of , it enters the second single photon detector, and is detected by the second single photon detector to obtain the second detection time; for each of the first detection time, the processor determines the Corresponding second detection times; the processor determines a plurality of delay information generated by the time dispersive element according to the plurality of first detection times and the corresponding plurality of second detection times, and uses the plurality of delay information The image of the object is obtained by coincidence calculation.

Preferably, the single photon detector is a single photon detector based on an avalanche diode or a single photon detector based on a superconducting nanowire;

The time dispersion element is a single-mode fiber with group velocity dispersion, a long-period grating or a pair of diffraction gratings.

(3) Beneficial effects

The present invention provides an image transmission system based on quantum ghost image and single-mode optical fiber. The present invention utilizes the characteristic that the optical fiber channel has little perturbation to the photon frequency, distributes the frequency-related two-photons in the optical fiber channel over a long distance, and transmits them through the associated The conversion of degrees of freedom realizes the long-distance transmission of images using fiber optic channels. It solves the problem that traditional quantum ghost images based on photon spatial momentum or spatial position entanglement/correlated photons are difficult to transmit in single-mode optical fibers that only support a single spatial mode, so it is impossible to use single-mode optical fiber channels to achieve long-distance image transmission. In addition, due to the use of quantum states, the physical principles of quantum mechanics can be used to ensure the security of quantum images.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the image transmission system based on quantum ghost image and single-mode optical fiber of the present invention;

Fig. 2 is a schematic structural diagram of an image sending module in a preferred embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an image sending module in another preferred embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an image receiving and processing module in a preferred embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an image receiving delay processing module in another preferred embodiment of the present invention;

Fig. 6a is the image of the original object that utilizes the system of the present invention to perform quantum ghost transfer;

Fig. 6b is a schematic diagram of the intermediate measurement results of quantum ghost transmission using the system of the present invention;

Fig. 6c is an image obtained by using the system of the present invention to perform quantum ghost transfer coincidence measurement and recovery.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

Fig. 1 is the structural representation of the image transmission system based on quantum ghost image and single-mode optical fiber of the present invention, and described system comprises:

a quantum light source for generating frequency correlated first photons and second photons;

The image sending module is connected to the quantum light source through a single-mode optical fiber, and receives the first photon emitted by the quantum light source; the image sending module includes a first spatial dispersion element and a first single-photon detector, and the first A photon is processed by the first spatial dispersion element, and is emitted to different directions according to different frequencies to irradiate the object; the first single-photon detector detects the first photon reflected or transmitted by the object to obtain the first photon a detection time;

The image receiving and processing module is connected to the quantum light source through a single-mode optical fiber, connected to the image sending module through a communication channel, and receives the second photon emitted by the quantum light source and the first photon sent by the image sending module. One detection time; the image receiving and processing module includes a second spatial dispersion element, a single photon detector array and a processor; the second photon is processed by the second spatial dispersion element and emitted to different directions according to different frequencies , and is detected by a single photon detector at a corresponding position in the single photon detector array to obtain a second detection time; the processor is based on a plurality of the first detection times, a plurality of second detection times and measurement The position information of the corresponding multiple single-photon detectors in the single-photon detector single-photon detector array at the multiple second detection times is calculated by coincidence to obtain an image of the object. The processor determines the corresponding second detection time according to the first detection time, and determines the frequency of the second photon according to the position information corresponding to the second detection time, so as to obtain the frequency of the first photon, thereby Determine where the first photon hits the object.

Further, the image sending module also includes an optical circulator, a fiber collimator and a focusing lens;

The first photon enters the fiber collimator through the optical circulator, and enters the first spatial dispersion element after being collimated, and the first photon emitted by the first spatial dispersion element passes through the After the focusing lens is irradiated onto the object; the first photon reflected by the object passes through the focusing lens, the first spatial dispersion element, the optical fiber collimator and the optical circulator in sequence, and is injected into the optical circulator by the optical circulator The first single photon detector.

Further, the image sending module also includes an optical fiber collimator, a focusing lens, and an optical fiber collecting device;

The first photons are injected into the fiber collimator, collimated and then injected into the first spatial dispersion element, and the first photons emitted by the first spatial dispersion element are irradiated to the object after passing through the focusing lens Above; the first photon transmitted by the object is collected by the optical fiber collecting device and then injected into the first single photon detector.

Further, the image receiving and processing module further includes a fiber collimator, and the second photons are injected into the second spatial dispersion module after being collimated by the fiber collimator.

Further, the quantum light source includes a pump light source and a nonlinear optical element excited by the pump light source to generate the first photon and the second photon.

Further, the nonlinear optical element is a crystal that produces a second-order parametric down-conversion effect or a nonlinear optical waveguide that produces a third-order spontaneous four-wave mixing effect.

Further, the crystals that produce the second-order parametric down-conversion effect are nonlinear optical crystals with various non-centrosymmetric lattice structures, periodically poled lithium niobate crystals, periodically poled lithium niobate waveguides, gallium arsenide and phosphorus Indium and other semiconductor materials with a non-centrosymmetric lattice structure.

The nonlinear optical waveguide generating the third-order spontaneous four-wave mixing effect is a silica fiber, a sulfide glass fiber, a silicon waveguide or a gallium nitride waveguide;

The pumping light source is a pulsed pumping light source or a continuous pumping light source.

Further, the second spatial dispersion element is a diffraction grating, a blazed grating, a prism or a spatial light modulator;

The first single photon detector is a single photon detector based on an avalanche diode or a single photon detector based on a superconducting nanowire;

The single-photon detector array is a silicon single-photon detector array, an indium-phosphorus/indium-gallium-arsenide-phosphorus single-photon detector array, an electron multiplying charge coupler or a superconducting nanowire single-photon detector array.

Further, the image receiving processing module is replaced with an image receiving delay processing module;

The image receiving delay processing module is connected to the quantum light source through a single-mode optical fiber, connected to the image sending module through a communication channel, and receives the second photon emitted by the quantum light source and the second photon sent by the image sending module. The first detection time; the image receiving delay processing module includes a time dispersive element, a second single photon detector and a processor; the second photon is processed by the time dispersive element, and is processed for different times according to different frequencies After a time delay of , it enters the second single photon detector, and is detected by the second single photon detector to obtain the second detection time; for each of the first detection time, the processor determines the Corresponding second detection times; the processor determines a plurality of delay information generated by the time dispersive element according to the plurality of first detection times and the corresponding plurality of second detection times, and uses the plurality of delay information The image of the object is obtained by coincidence calculation.

Further, the single photon detector is a single photon detector based on an avalanche diode or a single photon detector based on a superconducting nanowire;

The time dispersion element is a single-mode fiber with group velocity dispersion, a long-period grating or a pair of diffraction gratings.

According to the delay information, the frequency of the second photon is obtained, the frequency of the first photon is obtained according to the frequency of the second photon, and the position where the object is irradiated by the first photon is obtained according to the frequency of the first photon, to generate an image of the object.

The core idea of the present invention lies in: using the characteristics that the frequency degree of freedom information of photons can be effectively maintained after long-distance transmission in the communication optical fiber channel, the optical fiber channel is used to distribute the frequency-related photon pairs over a long distance. The correlation characteristics of the two photons in the two places of the frequency degree of freedom will be well maintained. In the two places of distribution, photons of different frequencies are projected to different positions of the object in different spatial propagation directions through the spatial dispersion element, and the reflected or transmitted single photons are collected and detected by a single-point single-photon detector, and a single photon is recorded. The arrival time information of the photon. In another place, photons of different frequencies can be projected to different spatial propagation directions through the spatial dispersion element, and then the photon arrival information can be recorded by using a single photon detector array with a certain spatial resolution capability, or the photons of different frequencies can be passed through the time dispersion element. Send it to a single-point single-photon detector to record the time information of photon arrival. This converts the frequency-correlated properties of the two photons into a space-space correlation or a space-time correlation. By coincidence counting measurements of two single-photon events, the object's information can be recovered. The detectors that record the photons that strike the object during this process are single-point detectors that do not have spatial resolution. The photons detected by the single-photon detector array with certain spatial resolution do not illuminate the object. The restoration of object information must be obtained through the coincidence count measurement of the two. Therefore, the function of quantum ghost image is realized. The invention can send two photons to two distant places by using the optical fiber, and realizes the function of long-distance transmission of the image of one place to another place through the optical fiber channel by using the principle of quantum ghost image.

Example:

As shown in Figure 1, the image transmission system based on quantum ghost image and single-mode optical fiber of the present embodiment specifically includes the following parts: a quantum light source 1 that generates frequency-correlated two-photons (first photon and second photon) with a wide spectrum; Single-mode optical fibers 4 and 5 for distributing frequency-related two photons in the fiber channel; image sender 2 (image sending module) and image receiver 3 (image receiving and processing module). Wherein, the sender 2 of the image holds the object to be imaged, and receives a distributed photon through the single-mode fiber channel 4 . The sender 2 of the image uses the spatial dispersion element to irradiate single photons of different frequencies to different spatial positions of the object, collects and detects the reflected or transmitted photons, and passes the time information of the received single photon event through the public channel (the sender of the image to the recipient of the image) 6 to the recipient 3 of the image. The receiver 3 of the image receives the other photon in the distributed photon pair through the long-distance single-mode fiber channel 5, and projects the arriving photon to different directions according to the frequency through the spatial dispersion element, and the single-mode photon with spatial resolution The photon detector array detects and records the corresponding position information of single photons. The receiver 3 of the image can also receive another photon distributed through the long-distance single-mode fiber channel 5, and introduce a frequency-dependent delay for the arriving photon through the time dispersive element, using a single-point single-photon detector (second Single-photon detectors) detect and record the temporal information of single-photon events. The receiver 3 of the image realizes the coincidence measurement according to the spatial information or time information of the single-photon event detected by itself and the received time information of the single-photon event of the image sender 2, and the result of the coincidence measurement reflects the imaging information of the object, so that the image The receiver 3 can image the object in the space domain or the time domain, and realize the long-distance image transmission based on the principle of quantum ghost image.

Wherein, the quantum light source 1 that generates frequency-correlated photon pairs can be realized through a nonlinear optical parametric process. The nonlinear elements that can be used to realize this quantum light source include crystals that can produce the second-order parametric down-conversion effect and nonlinear optical waveguides that can produce the third-order spontaneous four-wave mixing effect. Crystals that can realize the second-order parametric down-conversion effect include various nonlinear optical crystals, periodically poled lithium niobate crystals, periodically poled lithium niobate waveguides, gallium arsenide and indium phosphide with non-centrosymmetric lattice structures. semiconductors. Nonlinear optical waveguides that can realize the third-order spontaneous four-wave mixing effect include silica fibers, sulfide glass fibers, silicon waveguides, gallium nitride waveguides, etc. The pump light used to excite the nonlinear process can be either pulsed or continuous pump light.

The sender 2 of the image can adopt the structure in Fig. 2 or Fig. 3 according to the needs of collecting reflected light or transmitted light to realize the function of irradiating photons to different positions of the object according to their frequency and collecting and detecting them.

The structure in FIG. 2 includes a fiber collimator 7, a spatial dispersion element 8, a focusing lens 9, an image to be transmitted 10, an optical circulator 11, and a single-point single-photon detector 12 (first single-photon detector). The single photon (first photon) is sent into the space through the circulator 11 and the fiber collimator 7, and after passing through the spatial dispersion element 8, the light of different frequencies propagates in different spatial directions, and after passing through the lens 9, it is focused to the object 10 to be sent. In different positions; in this structure, the object 10 to be transmitted has spatially distributed light reflection, and the reflected photons return through the original path, exit at one port after passing through the circulator 11, and enter the single-point single-photon detector 12 Record.

The structure in FIG. 3 includes a fiber collimator 7, a spatial dispersion element 8, an image to be transmitted 10, a fiber collection device 13, a focusing lens 9, and a single-point single-photon detector 12 (first single-photon detector). The single photon (first photon) is emitted to the spatial optical path after passing through the fiber collimator 7, and after passing through the spatial dispersion element 8, the light of different frequencies propagates in different spatial directions, and is focused to different positions of the object 10 to be transmitted by the focusing lens 9 ; In this structure, the object 10 to be transmitted has a spatially distributed light transmission, and the transmitted photons are collected by an optical fiber collection device 13 to a single-point single-photon detector 12 for recording.

The optical path design of the receiver 3 of the image in FIG. 1 can have two implementation structures, which are shown in FIG. 4 and FIG. 5 respectively.

The structure in FIG. 4 includes a fiber collimator 14 , a spatial dispersion element 15 and a single-photon detector array 16 with spatial resolution. The photons of different frequencies distributed to the receiver 3 of the image through the optical fiber are sent to the spatial optical path after passing through the fiber collimator 14, and after passing through the spatial dispersion element 15, the photons of different frequencies will propagate in different spatial directions. The single photon detector array 16 with spatial resolution is used to detect and record the position where the single photon reaches the detector.

The structure of FIG. 5 includes a time dispersive element 17 and a single-point single-photon detector 18 (second single-photon detector). The photons of different frequencies distributed to the receiver 3 of the image through the optical fiber, after passing through the time dispersion element 17, obtain different time delays. A single-point single-photon detector 18 with relatively high time-resolution characteristics is used for detection, and the time information of the single-photon event is recorded.

Among them, the fiber collimator can use a combination of lenses, or a concave mirror, or a lens-like medium (including gradient refractive index materials) to couple the light propagating in the fiber into quasi-parallel light that propagates in space.

Wherein, the spatial dispersion elements 8 and 15 that emit photons of different frequencies to different directions include diffraction gratings, blazed gratings, prisms, spatial light modulators and other dispersion elements.

Wherein, the time dispersive element 17 that changes photons of different frequencies to reach the single-point single-photon detector 18 includes various single-mode optical fibers with group velocity dispersion, long-period gratings, and diffraction gratings.

The single-point single-photon detectors 12 and 18 used include single-photon detectors based on avalanche diode technology and single-photon detectors based on superconducting nanowires.

The column 16 of single photon detectors with spatial resolution can be silicon single photon detector arrays, indium phosphorus/indium gallium arsenic phosphorus single photon detector arrays, electron multiplying charge-coupled devices (EMCCDs), superconducting nanowire single photon detector arrays, Photon detector arrays, etc. The function of spatially resolved single-photon detection can also be realized by spatially moving the single-point single-photon detector.

The wide-spectrum frequency-correlated photon pair in this embodiment uses a femtosecond pulse laser to pump a nonlinear nano-silicon wire waveguide to stimulate the spontaneous four-wave mixing effect. The nano-silicon wire waveguide used has a cross-sectional size of 450x220nm and a length of about 11mm. Using the coarse wavelength division multiplexing device (CWDM) widely used in optical communication to filter the broad fluorescence spectrum generated by the pulse-pumped nonlinear nano-silicon wire, the signal photon with a spectral width of about 16nm (1531±8nm) was formed. and idler photons (1570±8nm), and the frequencies of signal photons and idler photons (first photon and second photon) are correlated together. The signal photon (the first photon) among the frequency-related two photons is transmitted to the image sender after a short optical fiber transmission, and is converted into spatial light emission by a fiber collimator, and the frequency degree of freedom is converted to the space degree of freedom. The structure is shown in Figure 2. The spatial dispersion element used therein is a blazed grating, and the image to be imaged is shown in Figure 6a. The object to be imaged as shown in Fig. 6a has reflectivity distributed in space, the black part indicates high reflectivity, and the white part indicates low reflectivity. The size of the object to be imaged is 160 μm x 160 μm. The photons converted from the frequency degree of freedom to the space degree of freedom will propagate in different spatial directions and illuminate different positions of the object. Since the one-dimensional grating used in this embodiment performs spatial dispersion, the light spot of the signal photon irradiating the object forms a line segment with a span of about 200 μm, covering the range of the object to be imaged laterally.

The idler photon (second photon) is distributed to the receiver of the image using 50km of standard communication single-mode optical fiber. In this embodiment, the group velocity dispersion of a standard communication single-mode fiber is used to convert the frequency degree of freedom of a single photon to the time degree of freedom. The group velocity dispersion coefficient of standard communication single-mode fiber is about 17 ps/nm/km, and the widened wave packet width estimated from the spectral width of idler photons is 14 ns.

In this embodiment, an InP/InGaAsP single photon detector is used for single photon detection, and a time-correlated single photon counting module with a resolution accuracy of about 164.6 ps is used for time recording of single photon events. The receiver of the image realizes time-domain coincidence measurement by analyzing the time information of the single-photon event of the sender of the image and the time information of the single-photon event detected by itself. The time-domain coincidence measurement results reflect the reflectivity distribution of the object to be imaged within the irradiation range of the signal photons. Fig. 6b is a typical coincidence counting result, which reflects the reflectance distribution of the object to be imaged within the irradiation range of the signal photons.

Because at the sending side of the image, photons with different frequencies are scattered in a spatial direction through the reflective blazed grating and irradiate a linear area of the object. Each measurement obtains information reflected in a linear area of the object. By installing the object on a space displacement stage, the moving object scans the object to be imaged using the linear area irradiated by photons and repeats the measurement, so that the two-dimensional image transmission of the object can be realized. Fig. 6c is the result of a two-dimensional image of the object to be transmitted transmitted by scanning the object to be imaged. The moving step of the object to be imaged is 10 μm in the direction perpendicular to the signal photon irradiation line area. The results of this embodiment illustrate that the two systems of the present invention can realize long-distance transmission of images in optical fiber channels based on the principle of quantum ghost images.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all should cover Within the scope of the claims of the present invention.

Claims (10)

1. the image delivery system based on quantum ghost image and single-mode fiber, it is characterised in that the system includes：

Quantum light source, for producing the first photon and the second photon of frequency association；

Image sending module, it is connected by single-mode fiber with the quantum light source, receives described the of quantum light source transmitting One photon；Described image sending module includes the first spatial dispersion element and the first single-photon detector, the first photon warp The first spatial dispersion element processing is crossed, different directions is transmitted into according to the difference of frequency, object is irradiated；It is described First photon that the detection of first single-photon detector is reflected or transmitted by object, obtains the first detection time；

Image-receptive processing module, it is connected with the quantum light source by single-mode fiber, is sent out by communication channel and described image Module is sent to connect, receive that second photon and described image sending module of quantum light source transmitting send described the One detection time；Described image receiving processing module includes second space dispersion element, single-photon detector array and processing Device；Second photon is handled by the second space dispersion element, and different directions is transmitted into according to the difference of frequency, and Detected by a single-photon detector of corresponding position in the single-photon detector array, obtain the second detection time；Institute Processor is stated according to multiple first detection times, multiple second detection times and the multiple second detection time of measurement The single-photon detector array in corresponding multiple single-photon detectors positional information, object is calculated by meeting Picture.

2. system according to claim 1, it is characterised in that described image sending module also includes optical circulator, optical fiber Collimater and condenser lens；

First photon injects the optical fiber collimator by the optical circulator, and first space is injected after collimation processing Dispersion element, the first photon projected by the first spatial dispersion element are irradiated on object after the condenser lens； By object reflection first photon successively by the condenser lens, the first spatial dispersion element, optical fiber collimator and Optical circulator, and first single-photon detector is injected by the optical circulator.

3. system according to claim 1, it is characterised in that described image sending module also includes optical fiber collimator, gathered Focus lens and optical fiber collecting device；

First photon injects the optical fiber collimator, the first spatial dispersion element is injected after collimation processing, by described The first photon that first spatial dispersion element projects is irradiated on object after the condenser lens；Described the of object transmission One photon injects first single-photon detector after being collected by the optical fiber collecting device.

4. system according to claim 1, it is characterised in that described image receiving processing module also includes fiber optic collimator Device, second photon inject the second space dispersion compensation module after optical fiber collimator collimation processing.

5. system according to claim 1, it is characterised in that the quantum light source includes pump light source and by the pump Pu light source excitation and the nonlinear optical element for producing first photon and the second photon.

6. system according to claim 5, it is characterised in that the nonlinear optical element is lower turn of two-stage parametric of generation Change the crystal of effect or produce the non-linear optical waveguide of the spontaneous four-wave mixing effect of three ranks.

7. system according to claim 6, it is characterised in that the crystal for producing transition effects under two-stage parametric is non- The nonlinear optical crystal of Central Symmetry lattice structure and the semi-conducting material with non-centrosymmetry lattice structure；

The non-linear optical waveguide for producing the spontaneous four-wave mixing effect of three ranks is silica fibre, chalcogenide glass optical fiber, silicon ripple Lead or gallium nitride waveguide；

The pump light source is pulse pump light source or continuous pump light source.

8. system according to claim 1, it is characterised in that the second space dispersion element is diffraction grating, glittering Grating, prism or spatial light modulator；

First single-photon detector is single-photon detector or the monochromatic light of based superconductive nano wire based on avalanche diode Sub- detector；

The single-photon detector array is silicon single-photon detector array, indium phosphorus/InGaAsP single-photon detector array, electricity Sub- multiplying charge coupler or superconducting nano-wire single-photon detector array.

9. according to the system described in any one of claim 1 to 8, it is characterised in that described image receiving processing module image Reception delay processing module is replaced；

Described image reception delay processing module is connected by single-mode fiber with the quantum light source, by communication channel with it is described Image sending module connects, and receives second photon and described image the sending module transmission of the quantum light source transmitting First detection time；Described image reception delay processing module include time dispersive element, the second single-photon detector with And processor；Second photon is handled by the time dispersive element, and different according to frequency carry out prolonging for different time When after inject second single-photon detector, and detect to obtain the second detection time by second single-photon detector；It is right In each first detection time, the processor determines the second corresponding detection time；The processor according to Multiple first detection times and corresponding multiple second detection times are determined as caused by the time dispersive element Multiple delayed datas, using the multiple delayed data, cross the picture for meeting and object being calculated.

10. system according to claim 9, it is characterised in that second single-photon detector is based on the pole of snowslide two The single-photon detector of pipe or the single-photon detector of based superconductive nano wire；

The time dispersive element is the single-mode fiber with group velocity dispersion, long-period gratings or diffraction grating pair.