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

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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203 Scopus citations

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.

Original language	English (US)
Article number	203110
Journal	Applied Physics Letters
Volume	96
Issue number	20
DOIs	https://doi.org/10.1063/1.3435463
State	Published - May 17 2010

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3435463

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title = "Fast reset and suppressing spontaneous emission of a superconducting qubit",

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.",

author = "Reed, {M. D.} and Johnson, {B. R.} and Houck, {A. A.} and L. Dicarlo and Chow, {J. M.} and Schuster, {D. I.} and L. Frunzio and Schoelkopf, {R. J.}",

note = "Funding Information: We acknowledge helpful discussions with M. H. Devoret and L. S. Bishop. This research was supported by LPS/NSA under ARO Contract No. W911NF-05-1-0365 and by the NSF under Grant Nos. DMR-0653377 and DMR-0603369. Additional support provided by CNR-Istituto di Cibernetica, Pozzuoli, Italy (L.F.).",

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doi = "10.1063/1.3435463",

language = "English (US)",

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T1 - Fast reset and suppressing spontaneous emission of a superconducting qubit

AU - Reed, M. D.

AU - Johnson, B. R.

AU - Houck, A. A.

AU - Dicarlo, L.

AU - Chow, J. M.

AU - Schuster, D. I.

AU - Frunzio, L.

AU - Schoelkopf, R. J.

N1 - Funding Information: We acknowledge helpful discussions with M. H. Devoret and L. S. Bishop. This research was supported by LPS/NSA under ARO Contract No. W911NF-05-1-0365 and by the NSF under Grant Nos. DMR-0653377 and DMR-0603369. Additional support provided by CNR-Istituto di Cibernetica, Pozzuoli, Italy (L.F.).

PY - 2010/5/17

Y1 - 2010/5/17

N2 - 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.

AB - 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.

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JF - Applied Physics Letters

IS - 20

M1 - 203110

ER -

Fast reset and suppressing spontaneous emission of a superconducting qubit

Abstract

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