Entanglement evaluation of non-Gaussian states generated by photon subtraction from squeezed states

By A. Kitagawa, Masahiro Takeoka, Masahide Sasaki, A. Chefles. 2005

177 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/fd55fc6274675977f042e7d76065c678d0b4aca6

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Hybrid discrete- and continuous-variable quantum information (2014, background): “Such an enhancement can also be obtained when the initial states are mixed and noisy after a lossy channel transmission [114, 115].”