Entanglement Creation and Storage in Two Qubits Coupling to an Anisotropic Heisenberg Spin Chain

TL;DR

This paper studies how two spin qubits become entangled and maintain their entanglement over time when coupled to an anisotropic Heisenberg XXZ spin chain environment, highlighting the effects of magnetic fields.

Contribution

It demonstrates the conditions under which entanglement can be generated and preserved in two qubits coupled to an anisotropic Heisenberg spin chain, including the role of magnetic fields.

Findings

Entanglement can be periodically created when magnetic field exceeds a critical value.

Entanglement can be stored at large values if qubits start in Bell state.

Entanglement dynamics depend on the magnetic field strength.

Abstract

The time evolution of the entanglement of a pair of two spin qubits is investigated when the two qubits simultaneously couple to an environment of an anisotropic Heisenberg XXZ spin chain. The entanglement of the two spin qubits can be created and is a periodic function of the time if the magnetic field is greater than a critical value. If the two spin qubits are in the Bell state, the entanglement can be stored with relatively large value even when the magnetic field is large.