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Transformations of symmetric multipartite Gaussian states by Gaussian local operations and classical communication

Authors
  • Černotík, Ondřej
  • Jaromír Fiurášek
Type
Published Article
Journal
Physical Review A
Publisher
American Physical Society
Publication Date
Apr 23, 2014
Volume
89
Issue
4
Source
MyScienceWork
License
Unknown

Abstract

Multipartite quantum correlations, in spite of years of intensive research, still leave many questions unanswered. While bipartite entanglement is relatively well understood for Gaussian states, the complexity of mere qualitative characterization grows rapidly with increasing number of parties. Here, we present two schemes for transformations of multipartite permutation invariant Gaussian states by Gaussian local operations and classical communication. To this end, we use a scheme for possible experimental realization, making use of the fact, that in this picture, the whole N-partite state can be described by specifying the states of two separable modes. Numerically, we study entanglement transformations of tripartite states. Finally, we look at the effect our protocols have on fidelity of assisted quantum teleportation and find that while adding correlated noise does not affect the fidelity at all, there is strong evidence that partial non-demolition measurement leads to a drop in teleportation fidelity.

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