High-Fidelity Quantum State Transfer in Multimode Resonators via Tunable Pulses

TL;DR

This paper presents a simple, tunable pulse protocol enabling high-fidelity quantum state transfer across single-mode and multimode regimes in quantum channels, robust against various imperfections.

Contribution

It introduces a minimal two-parameter control framework that unifies state transfer protocols across different coupling regimes, achieving over 99.9% fidelity without complex pulse shaping.

Findings

Achieved >99.9% transfer fidelity using pulse-shaped pitch-and-catch protocol.

Demonstrated robustness against dissipation, disorder, and detuning.

Extended protocol applicability to circuit-QED and hybrid systems.

Abstract

Quantum state transfer between distant nodes is essential for distributed quantum information processing. Existing protocols are typically optimized for specific coupling regimes, such as adiabatic dark-state transfer in the single-mode limit and pitch-and-catch schemes in the multimode regime, leaving the crossover between them without a simple and unified control strategy. Here we identify a minimal two-parameter control framework that enables high-fidelity quantum state transfer across this single-mode-to-multimode crossover in a multimode quantum channel. Using a pulse-shaped pitch-and-catch protocol controlled only by the pulse ramp rate and the emission-absorption delay, we achieve transfer fidelities exceeding 99.9%, extending pitch-and-catch protocols toward the single-mode limit without requiring dark-state protection or complex pulse design. We further demonstrate robustness against dissipation, disorder, detuning, and imperfect initialization under experimentally realistic conditions. These results provide a simple and broadly applicable framework for state transfer in multimode quantum channels, with relevance to circuit-QED and hybrid quantum-acoustic systems.