Controlling the spontaneous emission of a superconducting transmon qubit

A. A. Houck; 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

doi:10.1103/PhysRevLett.101.080502

Controlling the spontaneous emission of a superconducting transmon qubit

Mesoscale and Nanoscale Physics 2009-11-13 v1 Superconductivity Quantum Physics

Authors: A. A. Houck , 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

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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 two 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.

Keywords

transmon qubit spontaneous emission circuit QED coherence time microwave cavity semiclassical circuit model qubit lifetime

Cite

@article{arxiv.0803.4490,
  title  = {Controlling the spontaneous emission of a superconducting transmon qubit},
  author = {A. A. Houck and J. A. Schreier and B. R. Johnson and J. M. Chow and Jens Koch and J. M. Gambetta and D. I. Schuster and L. Frunzio and M. H. Devoret and S. M. Girvin and R. J. Schoelkopf},
  journal= {arXiv preprint arXiv:0803.4490},
  year   = {2009}
}

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4 pages, 4 figures

Controlling the spontaneous emission of a superconducting transmon qubit

Abstract

Keywords

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