Displacement gain dependent fidelity in quantum teleportation using entangled two-mode squeezed light
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We study a scheme for quantum teleportation of a single-mode squeezed coherent state using entangled two-mode squeezed vacuum. We establish the analytic expression of displacement gain dependent fidelity in terms of the squeezing coherent parameter \(r\) and quantum channel parameter \(p\). The dependence of the optimum displacement gain for teleporting a squeezed coherent state upon the EPR entanglement is discussed. It shows that the fidelity of teleportation can be improved by tuning the displacement gain. We find that the fidelity increases with the increase of EPR parameter, while it decreases with the increase of the squeezing coherent parameter of the signal. We get infinite squeezing as a resource is required for an ideal and perfect teleportation of unknown input states. We show that the nonclassical properties of an unknown state to be teleported can be preserved in the teleportation.
KeywordsQuantum teleportation Entangled states Fidelity Displacement gain Squeezed states
PACS:03.67.Hk 03.67.Lx 03.65Ud
We acknowledge to colleagues of ‘Theoretical Physics Division’ at PRL especially Mr. Shashi Prabhakar for their continuous support during the summer research project work. One of the authors (DKG) is supported by IAS-INSA-NASI, ‘Summer Research Fellowships’, India. We would like to thank the referees for his comments and valuable suggestions.
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