Quantum channel locally interacting with environment
Abstract
The quantum channel subject to local interaction with twolevel environment is studied. The twolevel 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.
 Publication:

Physical Review A
 Pub Date:
 March 2001
 DOI:
 10.1103/PhysRevA.63.034301
 arXiv:
 arXiv:quantph/0011069
 Bibcode:
 2001PhRvA..63c4301I
 Keywords:

 03.67.Hk;
 Quantum communication;
 Quantum Physics
 EPrint:
 4 pages, 2 figures, accepted to Phys. Rev. A, Brief Report