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Controlling the Spontaneous Emission of a Superconducting Transmon Qubit

2008; American Physical Society; Volume: 101; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.101.080502

1092-0145

Andrew Houck, J. A. Schreier, Blake Johnson, Jerry M. Chow, Jens Koch, Jay Gambetta, David Schuster, Luigi Frunzio, Michel Devoret, S. M. Girvin, Robert Schoelkopf,

Semiconductor Quantum Structures and Devices

We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far off-resonant modes of the cavity and can be understood within a semiclassical circuit model. A careful analysis of the spontaneous qubit decay into a microwave transmission-line cavity can accurately predict the qubit lifetimes over 2 orders of magnitude in time and more than an octave in frequency. Coherence times T1 and T_{2};{*} of more than a microsecond are reproducibly demonstrated.