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Violation of Bell's inequality in Josephson phase qubits

Author

Listed:
  • Markus Ansmann

    (University of California, Santa Barbara, California 93106, USA)

  • H. Wang

    (University of California, Santa Barbara, California 93106, USA)

  • Radoslaw C. Bialczak

    (University of California, Santa Barbara, California 93106, USA)

  • Max Hofheinz

    (University of California, Santa Barbara, California 93106, USA)

  • Erik Lucero

    (University of California, Santa Barbara, California 93106, USA)

  • M. Neeley

    (University of California, Santa Barbara, California 93106, USA)

  • A. D. O'Connell

    (University of California, Santa Barbara, California 93106, USA)

  • D. Sank

    (University of California, Santa Barbara, California 93106, USA)

  • M. Weides

    (University of California, Santa Barbara, California 93106, USA)

  • J. Wenner

    (University of California, Santa Barbara, California 93106, USA)

  • A. N. Cleland

    (University of California, Santa Barbara, California 93106, USA)

  • John M. Martinis

    (University of California, Santa Barbara, California 93106, USA)

Abstract

Quantum behaviour in electrical circuits Bell inequalities provide a quantitative measure that can distinguish classically determined correlations from stronger quantum correlations. Experiments on microscopic systems such as atoms and photons strongly favour the quantum description, but there has been no Bell test in a solid-state system. This paper reports clear evidence for violation of a Bell inequality (and thus quantum behaviour) in a macroscopic electrical circuit consisting of superconducting phase qubits.

Suggested Citation

  • Markus Ansmann & H. Wang & Radoslaw C. Bialczak & Max Hofheinz & Erik Lucero & M. Neeley & A. D. O'Connell & D. Sank & M. Weides & J. Wenner & A. N. Cleland & John M. Martinis, 2009. "Violation of Bell's inequality in Josephson phase qubits," Nature, Nature, vol. 461(7263), pages 504-506, September.
    • Handle: RePEc:nat:nature:v:461:y:2009:i:7263:d:10.1038_nature08363
    DOI: 10.1038/nature08363
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