Superradiance and phase multistability in circuit quantum electrodynamics

M. Delanty*, S. Rebix́, J. Twamley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


By modelling 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. Owing 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.

Original languageEnglish
Article number053032
Pages (from-to)1-13
Number of pages13
JournalNew Journal of Physics
Publication statusPublished - May 2011


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