Qubit Metrology of Ultralow Phase Noise Using Randomized Benchmarking

P. J. J. O’Malley, J. Kelly, R. Barends, B. Campbell, Y. Chen, Z. Chen, B. Chiaro, A. Dunsworth, A. G. Fowler, I.-C. Hoi, E. Jeffrey, A. Megrant, J. Mutus, C. Neill, C. Quintana, P. Roushan, D. Sank, A. Vainsencher, J. Wenner, T. C. White, A. N. Korotkov, A. N. Cleland, and John M. Martinis
Phys. Rev. Applied 3, 044009 – Published 17 April 2015

Abstract

A precise measurement of dephasing over a range of time scales is critical for improving quantum gates beyond the error correction threshold. We present a metrological tool based on randomized benchmarking capable of greatly increasing the precision of Ramsey and spin-echo sequences by the repeated but incoherent addition of phase noise. We find our superconducting-quantum-interference-device-based qubit is not limited by 1/f flux noise at short time scales but instead observe a telegraph noise mechanism that is not amenable to study with standard measurement techniques.

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  • Received 30 October 2014

DOI:https://doi.org/10.1103/PhysRevApplied.3.044009

© 2015 American Physical Society

Authors & Affiliations

P. J. J. O’Malley1, J. Kelly1,*, R. Barends1,*, B. Campbell1, Y. Chen1,*, Z. Chen1, B. Chiaro1, A. Dunsworth1, A. G. Fowler1,2,*, I.-C. Hoi1, E. Jeffrey1,*, A. Megrant1,3, J. Mutus1,*, C. Neill1, C. Quintana1, P. Roushan1,*, D. Sank1,*, A. Vainsencher1, J. Wenner1, T. C. White1, A. N. Korotkov4, A. N. Cleland1, and John M. Martinis1,*

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA
  • 2Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne, Victoria 3010, Australia
  • 3Department of Materials, University of California, Santa Barbara, California 93106, USA
  • 4Department of Electrical and Computer Engineering, University of California, Riverside, California 92521, USA

  • *Present address: Google Inc., Santa Barbara, California 93117, USA.

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Vol. 3, Iss. 4 — April 2015

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