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Quantum Physics

arXiv:1007.2231 (quant-ph)
[Submitted on 14 Jul 2010 (v1), last revised 11 Jul 2011 (this version, v2)]

Title:Superradiance and Phase Multistability in Circuit Quantum Electrodynamics

Authors:Michael Delanty, Stojan Rebic, Jason Twamley
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Abstract:By modeling the coupling of multiple superconducting qubits to a single cavity in the circuit-quantum electrodynamics (QED) framework we find that it should be possible to observe superradiance and phase multistability using currently available technology. Due to the exceptionally large couplings present in circuit-QED we predict that superradiant microwave pulses should be observable with only a very small number of qubits (just three or four), in the presence of energy relaxation and non-uniform qubit-field coupling strengths. This paves the way for circuit-QED implementations of superradiant state readout and decoherence free subspace state encoding in subradiant states. The system considered here also exhibits phase multistability when driven with large field amplitudes, and this effect may have applications for collective qubit readout and for quantum feedback protocols.
Comments: Published Version
Subjects: Quantum Physics (quant-ph); Superconductivity (cond-mat.supr-con)
Cite as: arXiv:1007.2231 [quant-ph]
  (or arXiv:1007.2231v2 [quant-ph] for this version)
  https://doi.org/10.48550/arXiv.1007.2231
Journal reference: New Journal of Physics 13 (2011) 053032
Related DOI: https://doi.org/10.1088/1367-2630/13/5/053032

Submission history

From: Michael Delanty [view email]
[v1] Wed, 14 Jul 2010 00:44:58 UTC (607 KB)
[v2] Mon, 11 Jul 2011 08:01:43 UTC (3,257 KB)
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