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Decoherence of Einstein-Podolsky-Rosen steering

By L. Rosales-Zarate, R. Y. Teh, S. Kiesewetter, A. Brolis, K. Ng and M. D. Reid


We consider two systems A and B that share Einstein-Podolsky-Rosen (EPR) steering correlations and study how these correlations will decay when each of the systems is independently coupled to a reservoir. EPR steering is a directional form of entanglement, and the measure of steering can change depending on whether system A is steered by B, or vice versa. First, we examine the decay of the steering correlations of the two-mode squeezed state. We find that if system B is coupled to a reservoir, then the decoherence of the steering of A by B is particularly marked, to the extent that there is a sudden death of steering after a finite time. We find a different directional effect if the reservoirs are thermally excited. Second, we study the decoherence of the steering of a Schrodinger cat state, modeled as the entangled state of a spin and harmonic oscillator, when the macroscopic system (the cat) is coupled to a reservoir

Topics: Quantum entanglement, Quantum optics, Decoherence, Directional effects, Einstein-Podolsky-rosen, Entangled state, Harmonic oscillators, Macroscopic systems, Sudden deaths, Two-mode squeezed state, Quantum theory
Publisher: Optical Society of American (OSA)
Year: 2015
DOI identifier: 10.1364/JOSAB.32.000A82
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