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Göteborgs universitets publikationer

Single-Site Entanglement of Fermions at a Quantum Phase Transition

Författare och institution:
Daniel Larsson (-); Henrik Johannesson (Institutionen för fysik (GU))
Publicerad i:
Phys. Rev. A , 73 s. 042310
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Fysik ->
Den kondenserade materiens fysik
Postens nummer:
Posten skapad:
2007-10-04 17:02

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