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5 papers

cond-mat.mes-hall2026

Correlation functions for quantum dynamics of coupled quasinormal modes and quantum emitters interacting via finite-delay propagating photons

Robert Meiners Fuchs, Juanjuan Ren, Sebastian Franke +2

The paper develops a time‑dependent framework describing how lossy cavities and quantum emitters interact through delayed photons, using quantized quasinormal modes and non‑bosonic…

cond-mat.mes-hall2026

Green's function expansion for multiple coupled optical resonators with finite retardation using quasinormal modes

Robert Meiners Fuchs, Juanjuan Ren, Stephen Hughes +1

The electromagnetic Green's function is a crucial ingredient for the theoretical study of modern photonic quantum devices, but is often difficult or even impossible to calculate di…

quant-ph2025

Dissipation in the Broadband and Ultrastrong Coupling Regimes of Cavity Quantum Electrodynamics: An Ab Initio Quantized Quasinormal Mode Approach

Chris Gustin, Juanjuan Ren, Sebastian Franke +1

Phenomenological approaches to photon loss have long been the workhorse of cavity-QED, but prove inadequate in the presence of sufficiently broadband light-matter interactions. We…

quant-ph2025

What is the spectral density of the reservoir for a lossy quantized cavity?

Chris Gustin, Juanjuan Ren, Stephen Hughes

By considering a two-level system weakly coupled to a single lossy three-dimensional cavity mode, and using a quasinormal mode expansion for the photonic medium, we show that the f…

quant-ph2025

Gain-modified emission dynamics between two quantum emitters in a plasmonic gain cavity system

Becca VanDrunen, Juanjuan Ren, Sebastian Franke +1

We present a general theory of gain-modified emission dynamics between two quantum emitters (two level systems) in a linear gain medium, demonstrating how gain modifies the usual r…