Breaking entanglement-breaking by classical correlations

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Abstract

The inevitable interaction between quantum systems and environment induces effects of decoherence which may be so strong as to destroy any initial entanglement between the systems, a phenomenon known as "entanglement breaking". Here we show the simplest examples where the combination of two entanglement-breaking channels into a joint correlated-noise environment reactivates the distribution of entanglement, with classes of entangled states which are perfectly transmitted from a middle station (Charlie) to two remote stations (Alice and Bob). Surprisingly, this reactivation is induced by the presence of purely-classical correlations in the joint environment, whose state is separable with zero discord. This paradoxical effect is proven for quantum systems with Hilbert spaces of any dimension, both finite and infinite.
Original languageEnglish
Pages (from-to)83-92
JournalProceedings of the First International Workshop on Entangled Coherent States and Its Application to Quantum Information Science, pp.
Publication statusPublished - 22 Jul 2013

Bibliographical note

See arXiv:1210.2119 for an extended version of this work

Keywords

  • quant-ph

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