Quantum state transfer between three ring-connected atoms

TL;DR

This paper proposes a robust, high-fidelity quantum state transfer method between three ring-connected atoms using an effective Ising model, which is insensitive to cavity leakage and atomic position, and can be sped up by spontaneous emission effects.

Contribution

It introduces a deterministic quantum state transfer scheme for three atoms in ring-connected cavities, utilizing simple local operations and demonstrating robustness against common experimental imperfections.

Findings

Achieves maximum fidelity transfer with minimal local operations.

Insensitivity to cavity leakage and atomic position variations.

Potential for faster implementation due to spontaneous emission effects.

Abstract

A robust quantum state transfer scheme is discussed for three atoms that are trapped by separated cavities linked via optical fibers in ring-connection. It is shown that, under the effective three-atom Ising model, arbitrary quantum state can be transferred from one atom to another deterministically via an auxiliary atom with maximum unit fidelity. The only required operation for this scheme is replicating turning on/off the local laser fields applied to the atoms for two steps with time cost $\frac{\sqrt{2}\pi}{\Gamma_{0}}$. The scheme is insensitive to cavity leakage and atomic position due to the condition $\Delta \approx \kappa\gg g$. Another advantage of this scheme is that the cooperative influence of spontaneous emission and operating time error can reduce the time cost for maximum fidelity and thus speed up the implementation of quantum state transfer.