Compact continuous-variable entanglement distillation

Animesh Datta, Lijian Zhang, Joshua Nunn, Nathan K Langford, Alvaro Feito, Martin B Plenio, Ian A Walmsley

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49 Citations (Scopus)

Abstract

We introduce a new scheme for continuous-variable entanglement distillation that requires only linear temporal and constant physical or spatial resources. Distillation is the process by which high-quality entanglement may be distributed between distant nodes of a network in the unavoidable presence of decoherence. The known versions of this protocol scale exponentially in space and doubly exponentially in time. Our optimal scheme therefore provides exponential improvements over existing protocols. It uses a fixed-resource module—an entanglement distillery—comprising only four quantum memories of at most 50% storage efficiency and allowing a feasible experimental implementation. Tangible quantum advantages are obtainable by using existing off-resonant Raman quantum memories outside their conventional role of storage.
Original languageEnglish
Article number060502
JournalPhysical Review Letters
Volume108
Issue number6
DOIs
Publication statusPublished - 8 Feb 2012

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    Datta, A., Zhang, L., Nunn, J., Langford, N. K., Feito, A., Plenio, M. B., & Walmsley, I. A. (2012). Compact continuous-variable entanglement distillation. Physical Review Letters, 108(6), [060502]. https://doi.org/10.1103/PhysRevLett.108.060502