On the dissipative dynamics of entangled states in coupled-cavity quantum electrodynamics arrays

TL;DR

This paper investigates how entangled N00N states evolve and decay in coupled-cavity quantum electrodynamics arrays, comparing two architectures and analyzing factors affecting their coherence and fidelity.

Contribution

It introduces a general theoretical framework for analyzing N00N state dynamics in complex CQED systems with multiple emitters and cavities.

Findings

Array scheme stores N00N states longer than DDI scheme.

DDI scheme achieves higher fidelity in N00N state preservation.

Decay rates depend on emitter-cavity coupling and detuning.

Abstract

We examine the dissipative dynamics of N00N states with an arbitrary photon number N in two architectures of fiber-coupled optical ring resonators (RRs) interacting with two-level quantum emitters. One architecture consists of a two-way cascaded array of emitter-cavity systems, while in the other architecture we consider two fiber-coupled RRs each coupled to multiple dipole-dipole interacting (DDI) quantum emitters (QEs). Our focus in this paper is to study how am initially prepared multiple excitation atomic N00N states transfers to the RRs and then how rapidly it decays in these open cavity quantum electrodynamics (CQED) setups while varying the emitter-cavity coupling strengths, emitter-cavity detuning, and backscattering from cavity modes. We present a general theoretical formalism valid for any arbitrary numbers of QEs, RRs, and N number in the N00N state for both schemes. As examples, we discuss the cases of single and two-excitation N00N states and report the comparison of our findings in both schemes. As one of the main results, we conclude that the array scheme tends to store N00N for longer times while the DDI scheme supports higher fidelity values. The results of this study may find applications in designing new multiparty entanglement-based protocols in quantum metrology and quantum lithography.