Restoring broken entanglement by separable correlations

Gaetana Spedalieri; Stefano Pirandola

doi:10.1117/12.2183071

Restoring broken entanglement by separable correlations

Gaetana Spedalieri, Stefano Pirandola

Computer Science

Research output: Contribution to conference › Paper › peer-review

Abstract

We consider two bosonic Gaussian channels whose thermal noise is strong enough to break bipartite entanglement. In this scenario, we show how the presence of separable correlations between the two channels is able to restore the broken entanglement. This reactivation occurs not only in a scheme of direct distribution, where a third party (Charlie) broadcasts entangled states to remote parties (Alice and Bob), but also in a configuration of indirect distribution which is based on entanglement swapping. In both schemes, the amount of entanglement remotely activated can be large enough to be distilled by one-way distillation protocols.

Original language	English
DOIs	https://doi.org/10.1117/12.2183071
Publication status	Published - 3 Sept 2015

Bibliographical note

SPIE Optics + Optoelectronics 2015, Quantum Optics and Quantum Information Transfer and Processing, Prague, Czech Republic (15-16/4/2015).

Keywords

quant-ph

Access to Document

10.1117/12.2183071

Cite this

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title = "Restoring broken entanglement by separable correlations",

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N2 - We consider two bosonic Gaussian channels whose thermal noise is strong enough to break bipartite entanglement. In this scenario, we show how the presence of separable correlations between the two channels is able to restore the broken entanglement. This reactivation occurs not only in a scheme of direct distribution, where a third party (Charlie) broadcasts entangled states to remote parties (Alice and Bob), but also in a configuration of indirect distribution which is based on entanglement swapping. In both schemes, the amount of entanglement remotely activated can be large enough to be distilled by one-way distillation protocols.

AB - We consider two bosonic Gaussian channels whose thermal noise is strong enough to break bipartite entanglement. In this scenario, we show how the presence of separable correlations between the two channels is able to restore the broken entanglement. This reactivation occurs not only in a scheme of direct distribution, where a third party (Charlie) broadcasts entangled states to remote parties (Alice and Bob), but also in a configuration of indirect distribution which is based on entanglement swapping. In both schemes, the amount of entanglement remotely activated can be large enough to be distilled by one-way distillation protocols.

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