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, and R. J. Schoelkopf
Phys. Rev. Lett. 101, 080502 – Published 21 August 2008

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 T2* of more than a microsecond are reproducibly demonstrated.

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  • Received 31 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.080502

©2008 American Physical Society

Authors & Affiliations

A. A. Houck1, J. A. Schreier1, B. R. Johnson1, J. M. Chow1, Jens Koch1, J. M. Gambetta2, D. I. Schuster1, L. Frunzio1, M. H. Devoret1, S. M. Girvin1, and R. J. Schoelkopf1

  • 1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA
  • 2Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

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Vol. 101, Iss. 8 — 22 August 2008

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