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

Chad Rigetti, Jay M. Gambetta, Stefano Poletto, Britton 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

Research output: Contribution to journalArticle

295 Citations (Scopus)

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 languageEnglish (US)
Article number100506
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number10
DOIs
StatePublished - Sep 24 2012

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Waveguides
waveguides
cavities
Aluminum Oxide
Error correction
Sapphire
Josephson junctions
Relaxation time
Copper
Q factors
sapphire
Photons
relaxation time
copper
Atoms
photons
Substrates
atoms
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms. / Rigetti, Chad; Gambetta, Jay M.; Poletto, Stefano; Plourde, Britton; Chow, Jerry M.; Córcoles, A. D.; Smolin, John A.; Merkel, Seth T.; Rozen, J. R.; Keefe, George A.; Rothwell, Mary B.; Ketchen, Mark B.; Steffen, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 10, 100506, 24.09.2012.

Research output: Contribution to journalArticle

Rigetti, C, Gambetta, JM, Poletto, S, Plourde, B, 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
Rigetti, Chad ; Gambetta, Jay M. ; Poletto, Stefano ; Plourde, Britton ; Chow, Jerry M. ; Córcoles, A. D. ; Smolin, John A. ; Merkel, Seth T. ; Rozen, J. R. ; Keefe, George A. ; Rothwell, Mary B. ; Ketchen, Mark B. ; Steffen, M. / Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 10.
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