Suppressing charge noise decoherence in superconducting charge qubits

J. A. Schreier; A. A. Houck; Jens Koch; D. I. Schuster; B. R. Johnson; J. M. Chow; J. M. Gambetta; J. Majer; L. Frunzio; M. H. Devoret; S. M. Girvin; R. J. Schoelkopf

doi:10.1103/PhysRevB.77.180502

Suppressing charge noise decoherence in superconducting charge qubits

J. A. Schreier, A. A. Houck, Jens Koch, D. I. Schuster, B. R. Johnson, J. M. Chow, J. M. Gambetta, J. Majer, L. Frunzio, M. H. Devoret, S. M. Girvin, R. J. Schoelkopf

Physics and Astronomy

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Abstract

We present an experimental realization of the transmon qubit, which is an improved superconducting charge qubit derived from the Cooper pair box. We experimentally verify the predicted exponential suppression of sensitivity to 1f charge noise. This removes the leading source of dephasing in charge qubits which results in homogeneously broadened transitions with relaxation and dephasing times in the microsecond range. Our systematic characterization of the qubit spectrum, anharmonicity, and charge dispersion shows excellent agreement with theory.

Original language	English (US)
Article number	180502
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.77.180502
State	Published - May 12 2008

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.77.180502

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Schreier, J. A., Houck, A. A., Koch, J., Schuster, D. I., Johnson, B. R., Chow, J. M., Gambetta, J. M., Majer, J., Frunzio, L., Devoret, M. H., Girvin, S. M., & Schoelkopf, R. J. (2008). Suppressing charge noise decoherence in superconducting charge qubits. Physical Review B - Condensed Matter and Materials Physics, 77(18), Article 180502. https://doi.org/10.1103/PhysRevB.77.180502

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AU - Schreier, J. A.

AU - Houck, A. A.

AU - Koch, Jens

AU - Schuster, D. I.

AU - Johnson, B. R.

AU - Chow, J. M.

AU - Gambetta, J. M.

AU - Majer, J.

AU - Frunzio, L.

AU - Devoret, M. H.

AU - Girvin, S. M.

AU - Schoelkopf, R. J.

PY - 2008/5/12

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AB - We present an experimental realization of the transmon qubit, which is an improved superconducting charge qubit derived from the Cooper pair box. We experimentally verify the predicted exponential suppression of sensitivity to 1f charge noise. This removes the leading source of dephasing in charge qubits which results in homogeneously broadened transitions with relaxation and dephasing times in the microsecond range. Our systematic characterization of the qubit spectrum, anharmonicity, and charge dispersion shows excellent agreement with theory.

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Suppressing charge noise decoherence in superconducting charge qubits

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