Violation of a Leggett-Garg inequality with ideal non-invasive measurements

George C. Knee, Stephanie Simmons, Erik M. Gauger, John J.L. Morton, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans Joachim Pohl, Kohei M. Itoh, Mike L.W. Thewalt, G. Andrew D. Briggs, Simon C. Benjamin

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble.

Original languageEnglish
Article number606
JournalNature communications
Volume3
DOIs
Publication statusPublished - 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Knee, G. C., Simmons, S., Gauger, E. M., Morton, J. J. L., Riemann, H., Abrosimov, N. V., Becker, P., Pohl, H. J., Itoh, K. M., Thewalt, M. L. W., Briggs, G. A. D., & Benjamin, S. C. (2012). Violation of a Leggett-Garg inequality with ideal non-invasive measurements. Nature communications, 3, [606]. https://doi.org/10.1038/ncomms1614