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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 3,
  • Issue S1,
  • pp. S286-S289
  • (2005)

A scheme for assisted cloning of a two-particle entangled state via GHZ class states

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Abstract

We propose a protocol where one can realize quantum cloning of an unknown two-particle entangled state and its orthogonal complement state with assistance offered by a state preparer. The first stage of the protocol requires usual teleportation using a (or two) four-particle entangled state(s) as quantum channel(s). In the second stage of the protocol, with the assistance (through a two-particle projective measurement) of the preparer, the perfect copies and complement copies of an unknown state can be produced.

© 2005 Chinese Optics Letters

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