Restoring broken entanglement by separable correlations
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.
Cite
@article{arxiv.1509.01091,
title = {Restoring broken entanglement by separable correlations},
author = {Gaetana Spedalieri and Stefano Pirandola},
journal= {arXiv preprint arXiv:1509.01091},
year = {2015}
}
Comments
SPIE Optics + Optoelectronics 2015, Quantum Optics and Quantum Information Transfer and Processing, Prague, Czech Republic (15-16/4/2015). Contains an analytical comparison between direct entanglement distribution (arXiv:1210.2119) and entanglement swapping (arXiv:1505.07457) in a general correlated-noise Gaussian environment