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Displacement-enhanced continuous-variable entanglement concentration

Authors
  • Černotík, Ondřej
  • Fiurášek, Jaromír
Type
Published Article
Journal
Physical Review A
Publisher
American Physical Society
Publication Date
Nov 24, 2012
Volume
86
Issue
5
Identifiers
DOI: 10.1103/physreva.86.052339
Source
MyScienceWork
License
Unknown

Abstract

We study entanglement concentration of continuous-variable Gaussian states by local photon subtractions enhanced by coherent displacements. Instead of the previously considered symmetric two-mode squeezed vacuum states, we investigate the protocol for input states in the form of split single-mode squeezed vacuum (i.e., states obtained by mixing a single-mode squeezed vacuum with a vacuum state on a beam splitter), which is an experimentally highly relevant configuration. We analyze two scenarios in which the displacement-enhanced photon subtraction is performed either only on one or on both of the modes and show that local displacements can lead to improved performance of the concentration protocol.

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