Robust Quantum State Transfer in Random Unpolarized Spin Chains

TL;DR

This paper introduces a robust method for quantum state transfer across random, unpolarized spin chains, enabling long-range, high-fidelity quantum communication without individual spin control, suitable for solid-state quantum devices.

Contribution

It presents a novel approach for perfect quantum state transfer in disordered spin chains using Hamiltonian evolution without spin manipulation, applicable at room temperature.

Findings

Achieves coherent coupling between remote qubits via random spin chains.

Demonstrates robustness to disorder and imperfections.

Shows potential for room-temperature quantum communication.

Abstract

We propose and analyze a new approach for quantum state transfer between remote spin qubits. Specifically, we demonstrate that coherent quantum coupling between remote qubits can be achieved via certain classes of random, unpolarized (infinite temperature) spin chains. Our method is robust to coupling strength disorder and does not require manipulation or control over individual spins. In principle, it can be used to attain perfect state transfer over arbitrarily long range via purely Hamiltonian evolution and may be particularly applicable in a solid-state quantum information processor. As an example, we demonstrate that it can be used to attain strong coherent coupling between Nitrogen-Vacancy centers separated by micrometer distances at room temperature. Realistic imperfections and decoherence effects are analyzed.