Bell's experiment with intra- and inter-pair entanglement: Single-particle mode entanglement as a case study

Abstract

Theoretical considerations of Bell-inequality experiments usually assume identically prepared and independent pairs of particles. Here we consider pairs that exhibit both intra- and inter-pair entanglement. The pairs are taken from a large many-body system where all the pairs are generally entangled with each other. Using an explicit example based on single mode entanglement and an ancillary Bose-Einstein condensate, we show that the Bell-inequality violation in such systems can display statistical properties that are remarkably different from those obtained using identically prepared, independent pairs. In particular, one can have probabilistic violation of Bell's inequalities in which a finite fraction of all the runs result in violation, even though there could be no violation when averaging over all the runs. Whether or not a particular run of results will end up being local realistically explainable is "decided" by a sequence of quantum (random) outcomes.

7 pages (two column), 5 figures

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Cited by in corpus (9)

• Essential entanglement for atomic and molecular physics
• Entanglement in indistinguishable particle systems
• Quantum teleportation with identical particles
• Entanglement consumption of instantaneous nonlocal quantum measurements
• Experimental violation of Bell inequalities for multi-dimensional systems
• Entanglement spectrum and number fluctuations in the spin-partitioned BCS ground state
• Performances and robustness of quantum teleportation with identical particles
• Bell inequality for pairs of particle-number-superselection-rule restricted states
• Teleportation of a quantum state of a spatial mode with a single massive particle