Variational Renormalization Group for Dissipative Spin-Cavity Systems: Periodic Pulses of Nonclassical Photons from Mesoscopic Spin Ensembles

TL;DR

This paper introduces a variational renormalization group method to analyze mesoscopic spin-cavity systems, demonstrating the generation of periodic nonclassical photon pulses from ensembles of up to a hundred spins.

Contribution

The paper develops a novel time-adaptive variational renormalization group technique to accurately simulate the quantum dynamics of dissipative spin-cavity systems.

Findings

Periodic pulses of nonclassical light observed from spin ensembles.

Method accurately captures Lindbladian quantum dynamics.

Potential for observing complex quantum phenomena in mesoscopic systems.

Abstract

Mesoscopic spin ensembles coupled to a cavity offer the exciting prospect of observing complex nonclassical phenomena that pool the microscopic features from a few spins with those of macroscopic spin ensembles. Here, we demonstrate how the collective interactions in an ensemble of as many as hundred spins can be harnessed to obtain a periodic pulse train of nonclassical light. To unravel the full quantum dynamics and photon statistics, we develop a time-adaptive variational renormalization group method that accurately captures the underlying Lindbladian dynamics of the mesoscopic spin-cavity system.