CN217008236U - Control line multiplexing circuit, control line circuit, quantum chip and quantum computer - Google Patents

Abstract

The utility model discloses a control line multiplexing circuit, a control line circuit, a quantum chip and a quantum computer, belongs to the technical field of quantum chips, and aims to solve the technical problem of how to realize multiplexing of a control line of a quantum bit chip. The control line multiplexing circuit includes: the direct current signal isolator is electrically connected between the control line and the qubit and is used for isolating direct current signals between the control line and the qubit; and the control signal filter is electrically connected between the control line and the qubit and is matched with the direct current signal isolator to send the control signal with specific frequency into the qubit.

Description

Control line multiplexing circuit, control line circuit, quantum chip and quantum computer

technical field

The utility model relates to the technical field of quantum chips, in particular to a control line multiplexing circuit, a control line circuit, a quantum chip and a quantum computer.

Background technique

As the core device of quantum computer, superconducting quantum computing chip is the key to affecting the performance of quantum computer. In superconducting quantum computing chips, qubits with Xmon structure are the most common form. As shown in Figure 1, each qubit of this structure requires two separate control lines to control a single qubit. They are the XY control line, which controls the bit state through the input microwave signal, and the Z control line, which changes the frequency of the qubit if the input current generates a magnetic flux. As the number of qubits on a quantum computing chip increases, more and more control lines are required, which will cause many difficulties in the design and wiring of quantum chips. If the distance between the control lines is too close, crosstalk will also occur between the control signals, which will affect the control accuracy and thus the performance of the quantum chip. A multiplexing scheme of control lines is needed to reduce the number of control lines and reduce the above-mentioned excessive bandwidth caused by control lines. to the negative impact, while reducing the chip area.

Based on the above analysis, how to realize the multiplexing of qubit chip control lines is a technical problem that needs to be solved.

SUMMARY OF THE INVENTION

The technical task of the present invention is to solve the technical problem of how to realize the multiplexing of the control lines of the quantum bit chip by providing a control line multiplexing circuit, a control line circuit, a quantum chip and a quantum computer in view of the above shortcomings.

In the first aspect, the control line multiplexing circuit of the present invention is used to realize the multiplexing of control lines between qubits in a superconducting quantum computing chip, and the control line multiplexing circuit includes:

a DC signal isolator, the DC signal isolator is electrically connected between the control line and the qubit, and is used for isolating the DC signal between the control line and the qubit;

A control signal filter, the control signal filter is electrically connected between the control line and the qubit, and cooperates with the DC signal isolator to send a control signal of a specific frequency into the qubit.

Preferably, the DC signal isolator is a capacitor, there are two capacitors in total, and the two capacitors are connected in series between the control line and the qubit.

Preferably, the control signal filter is a band-pass filter, the band-pass filter is electrically connected between the two capacitors, and a specific frequency control signal of the band-pass filter can enter the qubit.

Preferably, the control line is an XY control line as the main control line.

In the second aspect, the control line circuit of the present invention is applied to a superconducting quantum computing chip, including:

a control wire electrically connected to the qubit;

A control line multiplexing circuit, the control line multiplexing circuit is the control line multiplexing circuit according to any one of the first aspect, the control line multiplexing circuit is electrically connected between the control line and the qubit.

Preferably, the DC signal isolator is a capacitor, there are two capacitors in total, and the two capacitors are connected in series between the control line and the qubit.

Preferably, the control signal filter is a band-pass filter, the band-pass filter is electrically connected between the two capacitors, and a specific frequency control signal of the band-pass filter can enter the qubit.

Preferably, the control line is an XY control line as the main control line.

In the third aspect, the quantum chip of the present invention, which is a superconducting quantum computing chip, includes qubits and a control line circuit as described in any one of the second aspect, the control line circuit is electrically connected to the qubits .

In a fourth aspect, in the quantum computer of the present invention, the quantum chip according to the third aspect is configured in the quantum computer.

The control line multiplexing circuit, the control line circuit, the quantum chip and the quantum computer of the present invention have the following advantages: the DC signal isolator is used to isolate the DC signal, and the control signal filter is used to only allow the control signal of a specific frequency to pass through the transmission line to reach the specified quantum Bit, for a multi-bit quantum computing system with N qubits, the traditional scheme requires a separate XY control line for each bit. This scheme can be implemented with only one transmission line, which reduces the design difficulty, facilitates wiring, reduces It reduces the crosstalk between control lines and reduces the quantum chip area.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present utility model. For some novel embodiments, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

The present utility model will be further described below in conjunction with the accompanying drawings.

Fig. 1 is the structural representation of XY control line;

FIG. 2 is a schematic block diagram of a control line multiplexing circuit in Embodiment 1. FIG.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and implement it. In case of conflict, the embodiments of the present invention and the technical features in the embodiments may be combined with each other.

The embodiments of the present utility model provide a control line multiplexing circuit, a control line circuit, a quantum chip and a quantum computer, which are used to solve the technical problem of how to realize the multiplexing of control lines of a quantum bit chip.

Example 1:

The control line multiplexing circuit of the utility model is used to realize the multiplexing of control lines between quantum bits in a superconducting quantum computing chip. The control line multiplexing circuit comprises a DC signal isolator and a control signal filter, and the DC signal isolator It is electrically connected between the control line and the qubit, and is used to isolate the DC signal between the control line and the qubit; the control signal filter is electrically connected between the control line and the qubit, and cooperates with the DC signal isolator to separate the specific The frequency control signal is fed into the qubit.

In this embodiment, the control lines are XY control lines, and a total of one is used as the main control line.

The DC signal isolator is a capacitor, there are two capacitors in total, and the two capacitors are connected in series between the control line and the qubit. The DC signal between the control line and the qubit is isolated by the above two capacitors.

The control signal filter is a band-pass filter, which only allows a specific frequency control signal that can pass through the band-pass filter to enter the qubit to control its state.

In this embodiment, two capacitors are added between the main control line and the qubit, and a bandpass filter is added between the two capacitors. The multiplexing circuit replaces the original XY control line required for each qubit with a control bus. When the number of qubits on the chip is N, a total of N-1 control lines are reduced, which greatly reduces the The difficulty of chip design and wiring is reduced, and the crosstalk between control lines and the chip area are reduced.

Example 2:

The control line circuit of the utility model is applied to a superconducting quantum computing chip, and includes a control line and a control line multiplexing circuit, the control line is electrically connected with the quantum bits, and the control line multiplexing circuit is the control line multiplexing circuit disclosed in Embodiment 1, The control line multiplexing circuit is electrically connected between the control line and the quantum bit.

In this embodiment, the control lines are XY control lines, and a total of one is used as the main control line.

The DC signal isolator is a capacitor, there are two capacitors in total, and the two capacitors are connected in series between the control line and the qubit. The DC signal between the control line and the qubit is isolated by the above two capacitors.

The control signal filter is a band-pass filter, which only allows a specific frequency control signal that can pass through the band-pass filter to enter the qubit to control its state.

In this embodiment, two capacitors are added between the main control line and the qubit, and a bandpass filter is added between the two capacitors. The multiplexing circuit replaces the original XY control line required for each qubit with a control bus. When the number of qubits on the chip is N, a total of N-1 control lines are reduced, which greatly reduces the The difficulty of chip design and wiring is reduced, and the crosstalk between control lines and the chip area are reduced.

Example 3:

The quantum chip of the present invention is a superconducting quantum computing chip, comprising a quantum bit and a control line circuit as disclosed in Embodiment 2, and the control line circuit is electrically connected with the quantum bit.

Example 4:

In the quantum computer of the present invention, the quantum chip as disclosed in Embodiment 3 is configured in the quantum computer.

The present invention is shown and described in detail above through the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Those skilled in the art can know that the above-mentioned different embodiments can be combined. The means in the embodiments lead to more embodiments of the present invention, and these embodiments are also within the protection scope of the present invention.

Claims (10)

1. A control line multiplexing circuit for multiplexing control lines between qubits in a superconducting quantum computing chip, the control line multiplexing circuit comprising:

the direct current signal isolator is electrically connected between the control line and the qubit and is used for isolating direct current signals between the control line and the qubit;

and the control signal filter is electrically connected between the control line and the qubit and is matched with the direct current signal isolator to send the control signal with specific frequency into the qubit.

2. The control line multiplexing circuit of claim 1 wherein the dc signal isolators are two capacitors connected in series between the control line and the qubit.

3. The control line multiplexing circuit of claim 2, wherein the control signal filter is a band pass filter electrically connected between the two capacitors, and capable of entering a qubit via a frequency-specific control signal of the band pass filter.

4. The control line multiplexing circuit according to any of claims 1 to 3, wherein the control line is an XY control line as a main control line.

5. A control line circuit, characterized by being applied to a superconducting quantum computing chip, comprising:

a control line electrically connected with a qubit;

the control line multiplexing circuit of any one of claims 1-4 electrically connected between the control line and a qubit.

6. The control line circuit of claim 5, wherein said dc signal isolators are two capacitors connected in series between the control line and the qubit.

7. The control line circuit of claim 6, wherein the control signal filter is a band pass filter electrically connected between the two capacitors, the control signal being capable of entering a qubit via a frequency specific control signal of the band pass filter.

8. The control line circuit according to any one of claims 5 to 7, wherein the control line is an XY control line as a main control line.

9. A quantum chip, characterized in that the quantum chip is a superconducting quantum computing chip, comprising a qubit and a control line circuit according to any of claims 5 to 8, the control line circuit being electrically connected to the qubit.

10. A quantum computer, characterized in that the quantum computer is provided therein with a quantum chip as claimed in claim 9.

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