Experimental non-classicality of an indivisible quantum system

Radek Lapkiewicz, Peizhe Li, Christoph Schaeff, Nathan K. Langford, Sven Ramelow, Marcin Wieśniak and Anton Zeilinger ()
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Radek Lapkiewicz: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
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
Nathan K. Langford: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
Sven Ramelow: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
Marcin Wieśniak: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
Anton Zeilinger: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna

Nature, 2011, vol. 474, issue 7352, 490-493

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.

Date: 2011
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DOI: 10.1038/nature10119

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