Incoherent-mediator for quantum state transfer in the ultrastrong coupling regime

TL;DR

This paper proposes a method for high-fidelity quantum state transfer between qubits via an incoherent mediator in an ultrastrong coupling regime, enabling effective quantum communication even at finite temperatures.

Contribution

It introduces a novel approach to quantum state transfer using an incoherent mediator tuned to a forbidden transition, achieving high fidelity in thermally populated systems.

Findings

High-fidelity swap operation demonstrated

Effective quantum transfer in thermally populated systems

Potential for hot quantum information processing

Abstract

We study quantum state transfer between two qubits coupled to a common quantum bus that is constituted by an ultrastrong coupled light-matter system. By tuning both qubit frequencies on resonance with a forbidden transition in the mediating system, we demonstrate a high-fidelity swap operation even though the quantum bus is thermally populated. This proposal may have applications on hot quantum information processing within the context of ultrastrong coupling regime of light-matter interaction.