Floquet control of quantum dissipation in spin chains

TL;DR

This paper demonstrates that periodic Floquet driving can suppress decoherence in a spin-1/2 system coupled to a spin bath by creating Floquet bound states, offering a robust and practical decoherence control method.

Contribution

It introduces a Floquet-based protocol for decoherence suppression that is robust, easy to implement, and leverages the formation of Floquet bound states in spin systems.

Findings

Floquet bound states inhibit spin dissipation.

Decoherence suppression is robust against parameter fluctuations.

The method is analogous to photonic crystal environment control.

Abstract

Controlling the decoherence induced by the interaction of quantum system with its environment is a fundamental challenge in quantum technology. Utilizing Floquet theory, we explore the constructive role of temporal periodic driving in suppressing decoherence of a spin-1/2 particle coupled to a spin bath. It is revealed that, accompanying the formation of a Floquet bound state in the quasienergy spectrum of the whole system including the system and its environment, the dissipation of the spin system can be inhibited and the system tends to coherently synchronize with the driving. It can be seen as an analog to the decoherence suppression induced by the structured environment in spatially periodic photonic crystal setting. Comparing with other decoherence control schemes, our protocol is robust against the fluctuation of control parameters and easy to realize in practice. It suggests a promising perspective of periodic driving in decoherence control.