Teleportation via maximally and non-maximally entangled mixed states

  • Authors:

  • S. Adhikari;A. S. Majumdar;S. Roy;B. Ghosh;N. Nayak

  • Affiliations:

  • S. N. Bose National Centre of Basic Sciences, Kolkata, India;S. N. Bose National Centre of Basic Sciences, Kolkata, India;Techno India, Salt Lake City, Kolkata, India;Metropolitan Institution, Kolkata, India;Department of Applied Physics, Birla Institute of Technology Mesra, Ranchi, India

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2010

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Abstract

We study the efficiency of two-qubit mixed entangled states as resources for quantumteleportation. We first consider two maximally entangled mixed states, viz., the Wernerstate[1], and a class of states introduced by Munro et al. [2]. We show that the Wernerstate when used as teleportation channel, gives rise to better average teleportation fidelitycompared to the latter class of states for any finite value of mixedness. We then introducea non-maximally entangled mixed state obtained as a convex combination of a two-qubitentangled mixed state and a two-qubit separable mixed state. It is shown that such ateleportation channel can outperform another non-maximally entangled channel, viz.,the Werner derivative for a certain range of mixedness. Further, there exists a rangeof parameter values where the former state satisfies a Bell-CHSH type inequality andstill performs better as a teleportation channel compared to the Werner derivative eventhough the latter violates the inequality.