Phys. Rev. Lett. 101, 080502 (2008) [4 pages]Controlling the Spontaneous Emission of a Superconducting Transmon QubitReceived 31 March 2008; published 21 August 2008 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 T2* of more than a microsecond are reproducibly demonstrated. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.080502
DOI:
10.1103/PhysRevLett.101.080502
PACS:
03.67.Lx, 42.50.−p, 85.25.−j
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