Weak classicality in coupled N-level quantum systems

The notion of “weak classical limit” for coupled N -level quantum systems as N  → ∞ is introduced to understand the precise sense in which one attains classicality. There exists proofs that a system becomes classical at large N [1, 2]. On the other hand, it is known that non-locality and entanglemen...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2019-06, Vol.73 (6), p.1-8, Article 119
Main Authors: Sandhir, Radha Pyari, Ravishankar, V.
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Molecular
Optical and Plasma Physics
Physical Chemistry
Physics
Physics and Astronomy
Quantum entanglement
Quantum Information Technology
Quantum Physics
Regular Article
Spectroscopy/Spectrometry
Spintronics
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Summary:The notion of “weak classical limit” for coupled N -level quantum systems as N  → ∞ is introduced to understand the precise sense in which one attains classicality. There exists proofs that a system becomes classical at large N [1, 2]. On the other hand, it is known that non-locality and entanglement, the two hallmarks of non-classicality, thrive even as N  → ∞. We reconcile these results in this paper by showing that so called classicality is not so much an inherent property of the system, as it is a consequence of limited experimental resources. Our focus is largely on non-locality, for which we study the Bell-CHSH and CGLMP inequalities for N -level systems. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2019-100007-4