Abruption decay of entanglement and quantum communication through noise channels

TL;DR

This paper studies how entanglement in two-qubit systems degrades through Bloch channels, highlighting the influence of channel parameters and input state structure on entanglement robustness and quantum teleportation capability.

Contribution

It introduces a detailed analysis of entanglement decay in Bloch channels, showing partially entangled states are more robust and exploring their use in quantum teleportation.

Findings

Partially entangled states are more robust against noise.

Entanglement survivability increases with higher equilibrium channel values.

Output states can be effectively used for quantum teleportation.

Abstract

We investigate the dynamics of two qubits state through the Bloch channel. It is found that the degradation and sudden-death of the entanglement depend on the channel's parameters and the structure of the input state. Starting from partially entangled states as input state, the output states are more robust compared with those obtained from initial maximally entangled states. Also the survivability of entanglement increased as the absolute equilibrium values of the channel increased or the ratio between the longitudinal and transverse relaxation times gets smaller. Ability of using the output states as quantum channels to perform quantum teleportation is investigated. The idea that the useful output states are used to achieve the original quantum teleportation protocol is discussed.