Physics – Quantum Physics
Scientific paper
2005-12-09
Phys. Rev. A 73, 042310 (2006)
Physics
Quantum Physics
13 pages, 11 figures
Scientific paper
10.1103/PhysRevA.73.042310
We consider the problem of evaluating the entanglement of non-Gaussian mixed states generated by photon subtraction from entangled squeezed states. The entanglement measures we use are the negativity and the logarithmic negativity. These measures possess the unusual property of being computable with linear algebra packages even for high-dimensional quantum systems. We numerically evaluate these measures for the non-Gaussian mixed states which are generated by photon subtraction with on/off photon detectors. The results are compared with the behavior of certain operational measures, namely the teleportation fidelity and the mutual information in the dense coding scheme. It is found that all of these results are mutually consistent, in the sense that whenever the enhancement is seen in terms of the operational measures, the negativity and the logarithmic negativity are also enhanced.
Chefles Anthony
Kitagawa Akira
Sasaki Masahide
Takeoka Masahiro
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