Angular Momentum-Dependent Spectral Shift in Chiral Vacuum Cavities

TL;DR

This paper explores how quantum fluctuations in chiral vacuum cavities cause an angular momentum-dependent spectral shift in atoms, revealing novel effects beyond traditional methods with potential experimental observability.

Contribution

It introduces a hybrid light-matter transformation approach to analyze spectral shifts, demonstrating effectiveness in strong coupling and establishing a cavity-interaction framework for chiral vacuum phenomena.

Findings

Spectral shift depends on angular momentum in chiral vacuum cavities.

Method surpasses perturbative approaches, effective in strong coupling.

Predicted effects are experimentally observable.

Abstract

Based on a hybrid light-matter unitary transformation for cavity quantum electrodynamics, we investigate the spectral shift of an atom induced by quantum fluctuations in a chiral vacuum cavity. Remarkably, we find an intriguing angular momentum-dependent shift in the spectra of bound states. Our approach shows promise in going beyond traditional perturbative methods and demonstrates effectiveness even in the strong-coupling limit, as evidenced by our numerical benchmarks in the case of a two-dimensional quantum harmonic oscillator. In addition, we establish a cavity-interaction picture for calculating the chiral vacuum Rabi oscillation in the strong-coupling limit for a generic central potential. The anomalous spectral shift revealed in this study possesses both fundamental and practical significance and could be readily observed in experiments.