Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

M. D. Reed; B. R. Johnson; A. A. Houck; L. DiCarlo; J. M. Chow; D. I. Schuster; L. Frunzio; R. J. Schoelkopf

doi:10.1063/1.3435463

Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

Mesoscale and Nanoscale Physics 2010-06-01 v2 Superconductivity

Authors: M. D. Reed , B. R. Johnson , A. A. Houck , L. DiCarlo , J. M. Chow , D. I. Schuster , L. Frunzio , R. J. Schoelkopf

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Abstract

Spontaneous emission through a coupled cavity can be a significant decay channel for qubits in circuit quantum electrodynamics. We present a circuit design that effectively eliminates spontaneous emission due to the Purcell effect while maintaining strong coupling to a low-Q cavity. Excellent agreement over a wide range in frequency is found between measured qubit relaxation times and the predictions of a circuit model. Using fast (nanosecond time-scale) flux biasing of the qubit, we demonstrate in situ control of qubit lifetime over a factor of 50. We realize qubit reset with 99.9% fidelity in 120 ns.

Keywords

superconducting qubit Purcell effect spontaneous emission qubit reset circuit QED flux biasing

Cite

@article{arxiv.1003.0142,
  title  = {Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit},
  author = {M. D. Reed and B. R. Johnson and A. A. Houck and L. DiCarlo and J. M. Chow and D. I. Schuster and L. Frunzio and R. J. Schoelkopf},
  journal= {arXiv preprint arXiv:1003.0142},
  year   = {2010}
}

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4 pages, 3 figures

Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

Abstract

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