Decoherence-Free Emergence of Macroscopic Local Realism for entangled photons in a cavity

Abstract

We investigate the influence of environmental noise on polarization entangled light generated by parametric emission in a cavity. By adopting a recently developed separability criterion, we show that: i) self-stimulation may suppress the detrimental influence of noise on entanglement; ii) when self-stimulation becomes effective, a classical model of parametric emission incorporating noise provides the same results of quantum theory for the expectation values involved in the separability criterion. Moreover we show that, in the macroscopic limit, it is impossible to observe violations of local realism with measurements of $n$-particle correlations, whatever n but finite. These results provide an interesting example of the emergence of macroscopic local realism in the presence of strong entanglement even in the absence of decoherence.

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References in corpus (6)

• Quantum tensor product structures are observable-induced
• Experimental demonstration of continuous variable polarization entanglement
• Experimental observation of four-photon entanglement from down-conversion
• Quantum entanglement of a large number of photons
• Local Hidden Variable Theories for Quantum States
• Theory of an Entanglement Laser

Cited by in corpus (5)

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• Emergence of entanglement from a noisy environment: The case of polaritons