Improving continuous-variable entanglement distribution by separable states

Ladislav Mista, Natalia Korolkova

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We investigate the physical mechanism behind the counterintuitive phenomenon, the distribution of continuous-variable entanglement between two distant modes by sending a third separable auxiliary mode between them. For this purpose, we propose a more simple and more efficient protocol resulting in distributed entanglement with more than an order of the magnitude higher logarithmic negativity than in the previously proposed protocol. This protocol shows that the distributed entanglement originates from the entanglement of one mode and the auxiliary mode used for distribution, which is first destroyed by local correlated noises and restored subsequently by the interference of the auxiliary mode with the second distant separable correlated mode.

Original languageEnglish
Article number032310
Pages (from-to)-
Number of pages7
JournalPhysical Review. A, Atomic, molecular, and optical physics
Issue number3
Publication statusPublished - Sept 2009


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