Improving quantum state transfer: Correcting non-Markovian and distortion effects

TL;DR

This paper presents a correction strategy for quantum state transfer that accounts for wavepacket distortion and non-Markovian effects, significantly improving transfer fidelity in quantum communication systems.

Contribution

The authors develop a general quantum-optical model incorporating non-Markovian effects and propose a control pulse correction method to enhance state transfer fidelity.

Findings

Control pulses can compensate wavepacket distortion during propagation.

Fidelity improvements up to three orders of magnitude are achievable.

The correction strategy effectively addresses non-Markovian effects in quantum state transfer.

Abstract

Quantum state transfer is a key operation for quantum information processing. The original pitch-and-catch protocols rely on flying qubits or single photons with engineered wavepacket shapes to achieve a deterministic, fast and high-fidelity transfer. Yet, these protocols overlook two important factors, namely, the distortion of the wavepacket during the propagation and non-Markovian effects during the emission and reabsorption processes due to time-dependent controls. Here we address both difficulties in a general quantum-optical model and propose a correction strategy to improve quantum state transfer protocols. Including non-Markovian effects in our theoretical description, we show how to derive control pulses that imprint phases on the wavepacket that compensate the distortion caused by propagation. Our theoretical results are supported by detailed numerical simulations showing that a suitable correction strategy can improve state transfer fidelities up to three orders of magnitude.