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Experimental non-classicality of an indivisible quantum system

Author

Listed:
  • Radek Lapkiewicz

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
    Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences)

  • Peizhe Li

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna)

  • Christoph Schaeff

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
    Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences)

  • Nathan K. Langford

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
    Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences
    Present addresses: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK (N.K.L.); Institute of Theoretical Physics and Astrophysics, University of Gdansk, PL-80-952 Gdansk, Poland (M.W.).)

  • Sven Ramelow

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
    Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences)

  • Marcin Wieśniak

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
    Present addresses: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK (N.K.L.); Institute of Theoretical Physics and Astrophysics, University of Gdansk, PL-80-952 Gdansk, Poland (M.W.).)

  • Anton Zeilinger

    (Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
    Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences)

Abstract

Photonic qutrits beyond the classical world Quantum theory requires that, in contrast to classical physics, not all properties can be simultaneously well defined. Entanglement between the subsystems of a composite physical system is often considered to be the reason, although theory suggests that there is a deeper incompatibility between quantum mechanics and classical physics. Lapkiewicz et al. report an experiment with single three-state systems (photonic qutrits) that vividly demonstrates this incompatibility. They show that classical theory cannot explain the results, even though a qutrit is indivisible and cannot support entanglement between subsystems.

Suggested Citation

  • Radek Lapkiewicz & Peizhe Li & Christoph Schaeff & Nathan K. Langford & Sven Ramelow & Marcin Wieśniak & Anton Zeilinger, 2011. "Experimental non-classicality of an indivisible quantum system," Nature, Nature, vol. 474(7352), pages 490-493, June.
    • Handle: RePEc:nat:nature:v:474:y:2011:i:7352:d:10.1038_nature10119
    DOI: 10.1038/nature10119
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    Cited by:

    1. Man’ko, V.I. & Markovich, L.A., 2016. "Steering in spin tomographic probability representation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 458(C), pages 266-275.

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