Quantum Discord and Entanglement of Quasi-Werner States Based on Bipartite Entangled Coherent States |
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Authors: | Email author" target="_blank">Manoj?K?MishraEmail author Ajay?K?Maurya Hari?Prakash |
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Institution: | 1.Physics Department,University of Allahabad,Allahabad,India;2.Indian Institute of Information Technology,Allahabad,India;3.Space Applications Centre,ISRO,Ahmedabad,India |
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Abstract: | Present work is an attempt to compare quantum discord and quantum entanglement of quasi-Werner states formed with the four bipartite entangled coherent states (ECS) used recently for quantum teleportation of a qubit encoded in superposed coherent state. Out of these, the quasi-Werner states based on maximally ECS due to its invariant nature under local operation is independent of measurement basis and mean photon numbers, while for quasi-Werner states based on non-maximally ECS, it depends upon measurement basis as well as on mean photon number. However, for large mean photon numbers since non-maximally ECS becomes almost maximally entangled therefore dependence of quantum discord for non-maximally ECS based quasi-Werner states on the measurement basis disappears. |
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