Quantum channel locally interacting with environment

Details Quantum channel locally interacting with environment Quantum channel locally interacting with environment

2000-11-16

arxiv.org/abs/quant-ph/0011069v1

Phys. Rev. A 63, 034301 (2001)

Physics

Quantum Physics

4 pages, 2 figures, accepted to Phys. Rev. A, Brief Report

Scientific paper

10.1103/PhysRevA.63.034301

The quantum channel subject to local interaction with two-level environment is studied. The two-level environment is regarded as a quantum bit (qubit) as well as a pair of particles owned by Alice and Bob. The amount of entanglement initially shared by Alice and Bob is distributed among these three qubits due to the interaction. In this model, we show that the singlet fraction of the decohered quantum channel is uniquely determined by the distributed entanglement. When the decohered quantum channel is used under the standard teleportation scheme, the optimal teleportation fidelity is well understood by considering the remaining entanglement between environment and transmitted state.

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