Protected quantum-state transfer in decoherence-free subspaces

TL;DR

This paper presents a robust quantum state transfer protocol that leverages decoherence-free subspaces and coherent coupling in spin chains to protect quantum information from noise and decoherence, with confirmed numerical robustness.

Contribution

It introduces a novel quantum state transfer method combining decoherence-free subspaces with coherent coupling in spin chains, enhancing robustness against noise.

Findings

Perfect transfer of unknown quantum states in noisy channels

Protection against channel noise and environmental decoherence

Numerical validation of robustness with two-qubit encoding

Abstract

We propose and analyse a robust quantum state transfer protocol by the use of a combination of coherent quantum coupling and decoherence-free subspaces in a coupled quantum spin chain. Under decoherence, an arbitrary unknown quantum state embedded in a decoherence-free subspace can be perfectly transferred through a noisy channel being weakly coupled to two end registers. The method protects quantum information from both the channel noise and the environmental decoherence. A special case of utilizing two physical qubits to encode one logical qubit is considered as an example and the robustness is confirmed by numerical performances.