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

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199 Scopus citations


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.

Original languageEnglish (US)
Article number203110
JournalApplied Physics Letters
Issue number20
StatePublished - May 17 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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