Controlling the spontaneous emission of a superconducting transmon qubit |
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| Authors: | Houck A A Schreier J A Johnson B R Chow J M Koch Jens Gambetta J M Schuster D I Frunzio L Devoret M H Girvin S M Schoelkopf R J |
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| Institution: | Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA. |
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| Abstract: | 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. |
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