Robust Multiple-Range Coherent Quantum State Transfer

TL;DR

This paper introduces a robust quantum communication method enabling high-fidelity, two-way quantum state transfer over multiple ranges using adiabatic coupling and a defect-engineered data bus, resilient to noise and imperfections.

Contribution

It presents a novel scheme for coherent quantum state transfer over multiple ranges utilizing a defect-engineered chain and adiabatic coupling, enhancing robustness and controllability.

Findings

High-fidelity state transfer demonstrated via numerical simulations

Robustness against defects and environmental noise shown

Effective three-level system model validated

Abstract

We propose a multiple-range quantum communication channel to realize coherent two-way quantum state transport with high fidelity. In our scheme, an information carrier (a qubit) and its remote partner are both adiabatically coupled to the same data bus, i.e., an N}-site tight-binding chain that has a single defect at the center. At the weak interaction regime, our system is effectively equivalent to a three level system of which a coherent superposition of the two carrier states constitutes a dark state. The adiabatic coupling allows a well controllable information exchange timing via the dark state between the two carriers. Numerical results show that our scheme is robust and efficient under practically inevitable perturbative defects of the data bus as well as environmental dephasing noise.