Qubit Entanglement Dephasing Dynamics Driven by a Bath of Spins

TL;DR

This paper investigates how a spin environment influences entanglement decay and revival in a two-qubit system, revealing unique effects not seen with bosonic baths through analytical and numerical methods.

Contribution

It provides new analytical and numerical insights into entanglement dynamics driven by spin baths, highlighting the impact of environment initial states on entanglement behavior.

Findings

Block-entangled environment accelerates entanglement decay and revival

Analytical expressions derived for specific approximations

Distinct features observed compared to bosonic baths

Abstract

We study the entanglement dynamics for a two-spin system coupled to a spin environment of different configurations by z-x type interaction. The models considered in this paper are solved both analytically and numerically giving rise to some concise analytical expressions when certain approximations are properly made. Our purpose is to find how the initial states of the environment with different numbers of spins affect the decay or revival of the entanglement between central qubits. In Particular, it is found that the block-entangled environment could speed up the decay and revival of the qubit entanglement. Our results exhibit some interesting features that have not been found for a boson bath.