Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms

Chad Rigetti; Jay M. Gambetta; Stefano Poletto; B. L.T. Plourde; Jerry M. Chow; A. D. Córcoles; John A. Smolin; Seth T. Merkel; J. R. Rozen; George A. Keefe; Mary B. Rothwell; Mark B. Ketchen; M. Steffen

doi:10.1103/PhysRevB.86.100506

Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms

Chad Rigetti, Jay M. Gambetta, Stefano Poletto, B. L.T. Plourde, Jerry M. Chow, A. D. Córcoles, John A. Smolin, Seth T. Merkel, J. R. Rozen, George A. Keefe, Mary B. Rothwell, Mark B. Ketchen, M. Steffen

Department of Physics

Research output: Contribution to journal › Article › peer-review

443 Scopus citations

Abstract

We report a superconducting artificial atom with a coherence time of T2*=92 μs and energy relaxation time T ₁=70 μs. The system consists of a single Josephson junction transmon qubit on a sapphire substrate embedded in an otherwise empty copper waveguide cavity whose lowest eigenmode is dispersively coupled to the qubit transition. We attribute the factor of four increase in the coherence quality factor relative to previous reports to device modifications aimed at reducing qubit dephasing from residual cavity photons. This simple device holds promise as a robust and easily produced artificial quantum system whose intrinsic coherence properties are sufficient to allow tests of quantum error correction.

Original language	English (US)
Article number	100506
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.86.100506
State	Published - Sep 24 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Rigetti, C., Gambetta, J. M., Poletto, S., Plourde, B. L. T., Chow, J. M., Córcoles, A. D., Smolin, J. A., Merkel, S. T., Rozen, J. R., Keefe, G. A., Rothwell, M. B., Ketchen, M. B., & Steffen, M. (2012). Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms. Physical Review B - Condensed Matter and Materials Physics, 86(10), Article 100506. https://doi.org/10.1103/PhysRevB.86.100506

Rigetti, C, Gambetta, JM, Poletto, S, Plourde, BLT, Chow, JM, Córcoles, AD, Smolin, JA, Merkel, ST, Rozen, JR, Keefe, GA, Rothwell, MB, Ketchen, MB & Steffen, M 2012, 'Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms', Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 10, 100506. https://doi.org/10.1103/PhysRevB.86.100506

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abstract = "We report a superconducting artificial atom with a coherence time of T2*=92 μs and energy relaxation time T 1=70 μs. The system consists of a single Josephson junction transmon qubit on a sapphire substrate embedded in an otherwise empty copper waveguide cavity whose lowest eigenmode is dispersively coupled to the qubit transition. We attribute the factor of four increase in the coherence quality factor relative to previous reports to device modifications aimed at reducing qubit dephasing from residual cavity photons. This simple device holds promise as a robust and easily produced artificial quantum system whose intrinsic coherence properties are sufficient to allow tests of quantum error correction.",

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AU - Chow, Jerry M.

AU - Córcoles, A. D.

AU - Smolin, John A.

AU - Merkel, Seth T.

AU - Rozen, J. R.

AU - Keefe, George A.

AU - Rothwell, Mary B.

AU - Ketchen, Mark B.

AU - Steffen, M.

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AB - We report a superconducting artificial atom with a coherence time of T2*=92 μs and energy relaxation time T 1=70 μs. The system consists of a single Josephson junction transmon qubit on a sapphire substrate embedded in an otherwise empty copper waveguide cavity whose lowest eigenmode is dispersively coupled to the qubit transition. We attribute the factor of four increase in the coherence quality factor relative to previous reports to device modifications aimed at reducing qubit dephasing from residual cavity photons. This simple device holds promise as a robust and easily produced artificial quantum system whose intrinsic coherence properties are sufficient to allow tests of quantum error correction.

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Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms

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