Quantum nonreciprocal interactions via dissipative gauge symmetry

TL;DR

This paper introduces a novel method for achieving nonreciprocal quantum interactions based on local gauge symmetry in Lindblad master equations, bypassing the need for broken time-reversal symmetry and cascaded systems.

Contribution

It presents a new approach to quantum nonreciprocity using gauge symmetry, enabling dissipatively-stabilized quantum gates without relying on traditional cascaded system mechanisms.

Findings

Demonstrates nonreciprocal interactions without breaking TRS

Introduces a general quantum-information metric for nonreciprocity

Enables new dissipative quantum gate operations

Abstract

One-way nonreciprocal interactions between two quantum systems are typically described by a cascaded quantum master equation, and rely on an effective breaking of time-reversal symmetry as well as the balancing of coherent and dissipative interactions. Here, we present a new approach for obtaining nonreciprocal quantum interactions that is completely distinct from cascaded quantum systems, and that does not in general require broken TRS. Our method relies on a local gauge symmetry present in any Markovian Lindblad master equation. This new kind of quantum nonreciprocity has many implications, including a new mechanism for performing dissipatively-stabilized gate operations on a target quantum system. We also introduce a new, extremely general quantum-information based metric for quantifying quantum nonreciprocity.