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. 2008 Aug 22;101(8):080502.
doi: 10.1103/PhysRevLett.101.080502. Epub 2008 Aug 21.

Controlling the spontaneous emission of a superconducting transmon qubit

A A Houck  1 , J A Schreier, B R Johnson, J M Chow, Jens Koch, J M Gambetta, D I Schuster, L Frunzio, M H Devoret, S M Girvin, R J Schoelkopf
Affiliations

Controlling the spontaneous emission of a superconducting transmon qubit

A A Houck et al. Phys Rev Lett. .

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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