Multipartite continuous-variable entanglement distillation using local squeezing and only one photon-subtraction operation

TL;DR

This paper proposes a scalable multipartite entanglement distillation protocol for continuous-variable states that uses local squeezing and only one photon-subtraction operation, improving success probability and entanglement.

Contribution

It introduces a novel distillation scheme with success probability independent of the number of parties, using local squeezers and a single photon subtraction.

Findings

Success probability remains constant as the number of parties increases.

Both success probability and entanglement are enhanced simultaneously.

An N-mode transfer theorem from phase space to Hilbert space is developed.

Abstract

In this paper, we study entanglement distillation of multipartite continuous-variable Gaussian entangled states. Following Opatrn\'{y} \emph{et al.}'s photon subtraction (PS) scheme, the probability of successful distillation decreases exponentially with the number of parties $N$. However, here, we shall propose an entanglement distillation scheme whose success probability scales as a constant with $N$. Our protocol employs several local squeezers, but it requires only a single PS operation. Using the logarithmic negativity as a measure of entanglement, we find that both the success probability and the distilled entanglement can be improved at the same time. Moreover, an $N$-mode transfer theorem (transferring states from phase space to Hilbert space) is presented.