Decoherence of one-dimensional flying qubits due to their cross-talk and imperfections

TL;DR

This paper investigates how interactions and imperfections in disordered spin chains cause decoherence of flying qubits, highlighting shorter decoherence times in critical and diffusive regimes, which impacts quantum information applications.

Contribution

It provides a detailed analysis of decoherence mechanisms for propagating spin-1/2 excitations in generic spin chains, including non-integrable and disordered systems.

Findings

Decoherence times are shorter in near-critical regimes.

Decoherence is also enhanced in diffusive regimes.

Implications for quantum information processing are significant.

Abstract

We study decoherence of propagating spin-1/2 excitations in generic (non-integrable and/or disordered) spin chains. We find the relevant decoherence times to be shorter in both the near-critical and diffusive regimes (if any), which fact might have important implications for the recently proposed spin chain-based implementations of quantum information processing.