Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.080502
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Funding
- Yale University
- CNR-Istituto di Cibernetica (L.F.)
- ARO [W911NF-05-10365]
- NSF [DMR-0653377, DMR-0603369]
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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 T-1 and T-2(*) of more than a microsecond are reproducibly demonstrated.
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