Quantum Entanglement: Criteria and Collective Tests

Details Quantum Entanglement: Criteria and Collective Tests Quantum Entanglement: Criteria and Collective Tests

1997-07-11

arxiv.org/abs/quant-ph/9707026v1

Phys.Scripta T76 (1998) 52

Physics

Quantum Physics

12 pages LaTeX, one figure. Proceedings of Nobel Symposium 104: Modern Studies of Basic Quantum Concepts and Phenomena (Gimo,

Scientific paper

10.1238/Physica.Topical.076a0005

The state of a quantum system, consisting of two distinct subsystems, is called separable if it can be prepared by two distant experimenters who receive instructions from a common source, via classical communication channels. A necessary condition is derived and is shown to be more sensitive than Bell's inequality for detecting quantum inseparability. Moreover, collective tests of Bell's inequality (namely, tests that involve several composite systems simultaneously) may sometimes lead to a violation of Bell's inequality, even if the latter is satisfied when each composite system is tested separately.

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