Probing dissipation process via Fano resonance and collective effect in the X-ray cavity

TL;DR

This paper investigates the dissipation process in a nuclear ensemble embedded in a cavity by analyzing the complex trajectories of the Fano resonance parameter q, revealing methods to control decoherence via collective effects and cavity interactions.

Contribution

It introduces the extension of the Fano parameter q into the complex plane and explores how collective effects and controllable parameters influence dissipation and decoherence.

Findings

Complex trajectories of q can be manipulated by nuclear abundance and angle offset.

Strong energy exchange suppresses dissipation and decoherence.

Different controllable methods produce distinct trajectories in the complex plane.

Abstract

In the absence of time-reversal symmetry, the asymmetric parameter q of the Fano resonance is extended into the complex space, where its trajectory can be utilized to investigate the decoherence process. By embedding the ensemble of M$\ddot{\rm{o}}$ssbauer nuclei in the thin-film planar cavity in this work, the trajectories of asymmetric parameter q are studied via the collective effect of the nuclear ensemble, which is regulated by the nuclear abundance and angle offset. Due to the diverse controllable methods of the collective resonant strength, there are different straight lines and arc-shape trajectories in the complex plane, in which the slopes and the radius can be respectively adjusted by the angle offset and nuclear abundance. It is demonstrated that the dissipation process can be suppressed equivalently by the strong energy exchange between the cavity and nuclear ensemble. The present results could enrich the behaviors of the asymmetric parameter q in the complex plane and would provide new possibility for the decoherence research through the thin-film planar cavity.