Realism and the Physical World

Abstract

I consider the extent to which the applicability of the concept of classical realism is constrained, irrespective of the validity or not of the quantum formalism, by existing experiments both in the EPR-Bell setup, including recent experiments testing “nonlocal realistic” theories, and in the area of “macroscopic quantum coherence”. Unless we are willing to sacrifice one or more other intuitively plausible notions such as the conventional “arrow of time”, it appears impossible, in either context, to maintain the classical notion of realism. [Editors note: For a video of the talk given by Prof. Leggett at the Aharonov-80 conference in 2012 at Chapman University, see quantum.chapman.edu/talk-16.]

Notes

Acknowledgements

This work was supported in part by the National Science Foundation through grant no. NSF-EIA-03-50842.

References

  1. 1.
    E. Schrödinger, Naturwissenschaften 23, 807 (1935) ADSCrossRefGoogle Scholar
  2. 2.
    A. Einstein, B. Podolsky, N. Rosen, Phys. Rev. 47, 777 (1935) ADSCrossRefMATHGoogle Scholar
  3. 3.
    J.S. Bell, Physics 1, 195 (1965) Google Scholar
  4. 4.
    J.F. Clauser, A. Shimony, Rep. Prog. Phys. 41, 1881 (1978) ADSCrossRefGoogle Scholar
  5. 5.
    J.F. Clauser, M.A. Horne, A. Shimony, R.A. Holt, Phys. Rev. Lett. 23, 880 (1969) ADSCrossRefGoogle Scholar
  6. 6.
    A.J. Leggett, J. Phys. A 40, 3141 (2007) MathSciNetADSCrossRefMATHGoogle Scholar
  7. 7.
    A.J. Leggett, Found. Phys. 33, 1469 (2003), erratum, in press (2007) (the erratum inter alia improves the RHS of the final inequality (4.9) to \(2- \frac{4}{\pi}|sin \chi|\)) MathSciNetCrossRefGoogle Scholar
  8. 8.
    S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, A. Zeilinger, Nature 446, 871 (2007). Corrigendum Ibid., 449, 252 (2007) ADSCrossRefGoogle Scholar
  9. 9.
    T. Paterek, A. Fedrizzi, S. Gröblacher, T. Jennewein, M. Zukowski, M. Aspelmeyer, A. Zeilinger, Phys. Rev. Lett. 99, 210406 (2007) ADSCrossRefGoogle Scholar
  10. 10.
    C. Branciard, A. Ling, N. Gisin, C. Kurtsiefer, A. Lamas-Linares, V. Scarani, Phys. Rev. Lett. 99, 210407 (2007) ADSCrossRefGoogle Scholar
  11. 11.
    A.J. Leggett, J. Phys. Condens. Matter 14, R415 (2002) ADSCrossRefGoogle Scholar
  12. 12.
    A.J. Leggett, A. Garg, Phys. Rev. Lett. 54, 857 (1985) MathSciNetADSCrossRefGoogle Scholar
  13. 13.
    A.J. Leggett, Found. Phys. 18, 939 (1988) ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Italia 2014

Authors and Affiliations

  1. 1.Department of PhysicsNational University of SingaporeSingaporeSingapore
  2. 2.University of Illinois at Urbana-ChampaignUrbanaUSA

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