Physics – Quantum Physics
Scientific paper
2006-06-19
Phys. Rev. A 74, 032333 (2006)
Physics
Quantum Physics
7 pages, no figures, replaced with published version
Scientific paper
10.1103/PhysRevA.74.032333
We examine the implications of several recently derived conditions [Hillery and Zubairy, Phys. Rev. Lett. 96, 050503 (2006)] for determining when a two-mode state is entangled. We first find examples of non-Gaussian states that satisfy these conditions. We then apply the entanglement conditions to the study of several linear devices, the beam splitter, the parametric amplifier, and the linear phase-insensitive amplifier. For the first two, we find conditions on the input states that guarantee that the output states are entangled. For the linear amplifier, we determine in the limit of high and no gain, when an entangled input leads to an entangled output. Finally, we show how application of two two-mode entanglement conditions to a three-mode state can serve as a test of genuine three-mode entanglement.
Hillery Mark
Zubairy Suhail M.
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