Multipartite continuous-variable entanglement distillation using local squeezing and only one photon-subtraction operation
Song Yang, Xu‐Bo Zou, ShengLi Zhang, Bao‐Sen Shi, Peter van Loock, Guang‐Can Guo · arXiv (Cornell University) · 2011
In this paper, we study entanglement distillation of multipartite continuous-variable Gaussian entangled states. Following Opatrný \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.