Quantum state transfer through a qubit network with energy shifts and fluctuations

TL;DR

This paper investigates quantum state transfer in qubit networks with XY interactions, demonstrating that energy shifts can enable perfect transfer and analyzing the impact of fluctuations on fidelity.

Contribution

It introduces energy shifting as a method to enhance quantum state transfer and provides analytical results for specific network topologies.

Findings

Perfect transfer achievable with energy shifts

Energy shifts improve transfer capabilities in certain networks

Random fluctuations reduce transmission fidelity

Abstract

We study quantum state transfer through a qubit network modeled by spins with XY interaction, when relying on a single excitation. We show that it is possible to achieve perfect transfer by shifting (adding) energy to specific vertices. This technique appears to be a potentially powerful tool to change, and in some cases improve, transfer capabilities of quantum networks. Analytical results are presented for all-to-all networks and all-to-all networks with a missing link. Moreover, we evaluate the effect of random fluctuations on the transmission fidelity.