A study in the optimal fidelity of continuous-variable teleportation.

ORAL

Abstract

We introduce three tunable parameters to optimize the fidelity of quantum teleportation with continuous-variable in nonideal scheme. Using the characteristic function formalism, we present the condition that the teleportation fidelity is independent of the amplitude of input coherent states for any entangled resource. Then we investigate the effects of tunable parameters on the fidelity with or without the presence of environment and imperfect measurements, by analytically deriving the expression of fidelity for three different input coherent state distributions. It is shown that, for the linear distribution, the optimization with three tunable parameters is the best one with respect to single- and two-parameter optimization. Our results reveal the usefulness of tunable parameters for improving the fidelity of teleportation and the ability against the decoherence.

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Authors

  • LiYun Hu

    Department of Physics and Institute of Quantum Studies,Texas A&M University

  • Zeyang Liao

    Institute of Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, College Station, TX, Department of Physics and Institute of Quantum Studies,Texas A&M University, Institute for Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University

  • Shengli Ma

    Department of Physics and Institute of Quantum Studies,Texas A&M University

  • M. Suhail Zubairy

    Institute of Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, College Station, TX, Institute for Quantum Science and Engineering (IQSE) and Department of Physics & Astronomy, Texas A&M University, College Station, Texas 77843, USA, Texas A&M University, Institute for Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, Department of Physics and Institute of Quantum Studies,Texas A&M University