Quantum switch for single-photon transport in a coupled superconducting transmission-line-resonator array

Quantum critical coupling conditions for zero single-photon transmission through a coupled atom-resonator-waveguide system

The quantum critical coupling conditions, where single-photon transmission goes to zero, for systems of a coupled ring resonator and atom in a one-dimensional single-mode waveguide are discussed. The quantum critical coupling conditions could be achieved even with nonvanishing intrinsic losses of the resonator and the atom, with intermode backscattering between the whispering-gallery modes of t...

Quantum Zeno switch for single-photon coherent transport

Department of Physics, Hunan Normal University, Changsha 410081, China Advanced Science Institute, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan Institute of Theoretical Physics, The Chinese Academy of Sciences, Beijing 100080, China CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan Center for Theoretical Physics, Physics De...

Hybrid atom-photon quantum gate in a superconducting microwave resonator

We propose a hybrid quantum gate between an atom and a microwave photon in a superconducting coplanar waveguide cavity by exploiting the strong resonant microwave coupling between adjacent Rydberg states. Using experimentally achievable parameters gate fidelities >0.99 are possible on submicrosecond time scales for waveguide temperatures below 40 mK. This provides a mechanism for generating ent...

Hybrid quantum circuit consisting of a superconducting flux qubit coupled to a spin ensemble and a transmission-line resonator

Ze-Liang Xiang,1,2 Xin-You Lü,2 Tie-Fu Li,3,4 J. Q. You,1,2,4 and Franco Nori2,5 1Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China 2Advanced Science Institute, RIKEN, Saitama 351-0198, Japan 3Institute of Microelectronics and Tsinghua National Laboratory of Information Science and Technology, Tsinghua University, Beijing 100084, China 4...

Superconducting-nanowire single-photon-detector linear array