Giant atoms with time-dependent couplings

TL;DR

This paper investigates how time-dependent couplings in a giant atom-waveguide system influence decay dynamics, enabling control over atom behavior and simulation of quantum effects for quantum information applications.

Contribution

It introduces a model for giant atoms with modulated couplings, revealing controllable decay and quantum Zeno effects in non-Markovian regimes.

Findings

Decay dynamics depend on earlier coupling strengths

Stationary population revival achievable with modulation

Quantum Zeno and anti-Zeno effects simulated

Abstract

We study the decay dynamics of a two-level giant atom that is coupled to a waveguide with time-dependent coupling strengths. In the non-Markovian regime where the retardation effect cannot be ignored, we show that the dynamics of the atom depends on the atom-waveguide coupling strengths at an earlier time. This allows one to tailor the decay dynamics of the giant atom and even realize a stationary population revival with appropriate coupling modulations. Moreover, we demonstrate the possibility of simulating the quantum Zeno and quantum anti-Zeno effects in the giant-atom model with periodic coupling quenches. These results have potential applications in quantum information processing and quantum network engineering.