Fast, high fidelity information transmission through spin chain quantum wires

TL;DR

This paper demonstrates that high-speed, high-fidelity quantum information transfer through spin chains can be achieved with minimal control, using optimized local switching sequences even in disordered systems.

Contribution

It introduces a minimalist control method for quantum spin chain wires that significantly improves transfer speed and fidelity with simple local actuation.

Findings

Optimization enables effective switching sequences for ideal and disordered chains.

High transfer fidelity is achievable with minimal local control.

Simulations show robustness even without precise models.

Abstract

Spin chains have been proposed as quantum wires for information transfer in solid state quantum architectures. We show that huge gains in both transfer speed and fidelity are possible using a minimalist control approach that relies only a single, local, on-off switch actuator. Effective switching time sequences can be determined using optimization techniques for both ideal and disordered chains. Simulations suggest that effective optimization is possible even in the absence of accurate models.