Decoherence-free Behaviors of Quantum Emitters in Dissipative Photonic Graphene

TL;DR

This paper demonstrates how dissipation engineering in photonic graphene can create decoherence-free states and interactions for quantum emitters, advancing quantum coherence protection in complex photonic systems.

Contribution

It introduces a novel approach to achieve decoherence-free quantum states and interactions in dissipative photonic graphene, including the analysis of dissipation-dependent relaxation and topological edge states.

Findings

Dissipation-dependent logarithmic relaxation predicted for single emitters.

Identification of dissipation-robust quasilocalized states.

Extension of decoherence-free interactions to topological edge states.

Abstract

Achieving decoherence-free quantum state manipulation is a paramount goal in modern quantum technologies. To this end, we demonstrate its implementation in a two-dimensional dissipative photonic graphene featuring exceptional rings. Employing the resolvent method, we analytically explore the quantum dynamics of emitters coupled to photonic graphene. In the thermodynamic limit, our analysis predicts a dissipation-dependent logarithmic relaxation for a single quantum emitter, alongside a pronounced quantum Zeno effect that slows the decay with increased dissipation. Notably, within a finite lattice, the excitation of single quantum emitter stabilizes in a decoherence-protected quantum state, which is identified as a dissipation-robust quasilocalized state. Interestingly, this state, together with a dark state, facilitates decoherence-free interactions between quantum emitters. This capability can be extended to topological graphenic platforms, where edge states mediate analogous protected interactions among giant atoms. Our findings highlight a promising path toward protecting quantum coherence in practical, high-dimensional photonic environment through dissipation engineering.