Decoherence by a spin thermal bath: Role of the spin-spin interactions

TL;DR

This paper investigates how the structure and interaction strength within a spin-bath environment influence the decoherence behavior of a coupled spin system, revealing a transition from Gaussian to exponential decay modes.

Contribution

It demonstrates the critical role of spin connectivity and coupling strength in determining decoherence dynamics, highlighting a transition in decay laws.

Findings

Connectivity and coupling strength alter decoherence from Gaussian to exponential decay.

Decoherence behavior depends critically on the environment's internal spin interactions.

The study emphasizes the importance of environment structure in quantum decoherence processes.

Abstract

We study the decoherence of two coupled spins that interact with a spin-bath environment. It is shown that the connectivity and the coupling strength between the spins in the environment are of crucial importance for the decoherence of the central system. Changing the connectivity or coupling strenghts changes the decoherence of the central system from Gaussian to exponential decay law.