Quantum anti-Zeno effect in artificial quantum systems

TL;DR

This paper demonstrates a quantum anti-Zeno effect in artificial quantum systems where repetitive measurements induce decay outside the natural energy band, revealing measurement-driven relaxation in structured baths.

Contribution

It introduces the concept of measurement-induced quantum anti-Zeno effect in artificial atom-bath systems with photonic band structures, highlighting new decay mechanisms.

Findings

Repetitive measurements induce decay outside the bath's energy band.

Decay is suppressed without measurements, but enhanced with measurements.

Counter-rotating terms and van Hove singularities influence decay rates.

Abstract

In this paper, we study a quantum anti-Zeno effect (QAZE) purely induced by repetitive measurements for an artificial atom interacting with a structured bath. This bath can be artificially realized with coupled resonators in one dimension and possesses photonic band structure like Bloch electron in a periodic potential. In the presence of repetitive measurements, the pure QAZE is discovered as the observable decay is not negligible even for the atomic energy level spacing outside of the energy band of the artificial bath. If there were no measurements, the decay would not happen outside of the band. In this sense, the enhanced decay is completely induced by measurements through the relaxation channels provided by the bath. Besides, we also discuss the controversial golden rule decay rates originated from the van Hove's singularities and the effects of the counter-rotating terms.