Nonreciprocal Entanglement by Dynamically Encircling a Nexus

TL;DR

This paper introduces a universal nonlinear method to generate stable, robust nonreciprocal entanglement in dissipative optomechanics by dynamically encircling a bistability nexus, advancing quantum information processing.

Contribution

It proposes a novel nonlinear mechanism leveraging bistability to achieve magnetic-free, stable nonreciprocal entanglement in quantum systems.

Findings

Demonstrates nonreciprocal displacement via bistability encircling

Achieves robust nonreciprocal entanglement with stability against environmental fluctuations

Provides a framework for nonreciprocal quantum information processing

Abstract

Nonreciprocal entanglement, characterized by inherently robust operation, is a cornerstone for quantum information processing and communications. However, it remains a great challenge to achieve nonreciprocal entanglement characterized by stability and robustness against environmental fluctuations. Here, we propose a universal nonlinear mechanism to engineer magnetic-free nonreciprocity in dissipative optomechanics by utilizing bistability, a phenomenon ubiquitous across nonlinear physical systems. By dynamically encircling the nexus of bistability, a cusp converged by the bistable surfaces, we obtain nonreciprocal displacement and then utilize it to achieve robust nonreciprocal entanglement. Owing to the unique landscape of bistability, our nonreciprocal displacement and entanglements exhibit stability and robustness through closed-loop operations. Our work presents a foundational framework for leveraging nonlinearity to achieve nonreciprocal quantum information processing. It paves new avenues for exploring nonreciprocal quantum information processing and designing backaction-immune quantum metrology with nonlinearity.