Quantum information transmission through a qubit chain with quasi-local dissipation

TL;DR

This paper investigates how quasi-local dissipation affects quantum information transfer in a Heisenberg-XY chain, revealing conditions under which it improves or worsens transfer fidelity compared to local dissipation.

Contribution

It provides a comparative analysis of quasi-local versus local environmental effects on quantum state transfer in spin chains, highlighting scenarios where quasi-local dissipation is beneficial.

Findings

Quasi-local dissipation improves transfer in open boundary chains.

In closed chains, quasi-local environment is advantageous under strong noise.

Transfer fidelity varies with chain length and noise strength.

Abstract

We study quantum information transmission in a Heisenberg-XY chain where qubits are affected by quasi-local environment action and compare it with the case of local action of the environment. We find that for open boundary conditions the former situation always improves quantum state transfer process, especially for short chains. In contrast, for closed boundary conditions quasi-local environment results advantageous in the strong noise regime. When the noise strength is comparable with the XY interaction strength, the state transfer fidelity through chain of odd/even number of qubits in presence of quasi-local environment results smaller/greater than that in presence of local environment.