Quantum channel locally interacting with environment

Abstract

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.

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

References in corpus (5)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Mixed State Entanglement and Quantum Error Correction
• Entanglement of a Pair of Quantum Bits
• Distributed Entanglement
• Local environment can enhance fidelity of quantum teleportation

Cited by in corpus (5)

• Fidelity of Quantum Teleportation through Noisy Channels
• The fully entangled fraction as an inclusive measure of entanglement applications
• Qubits entanglement dynamics modified by an effective atomic environment
• Reexamination of determinant-based separability test for two qubits
• Quantum teleportation by utilizing helical spin chains for sharing entanglement