Entangling color centers via magnon-antimagnon pair creation

TL;DR

This paper demonstrates how entanglement between spatially separated color centers can be generated via magnon-antimagnon pair creation in a nonequilibrium magnetic environment, revealing a novel quantum entanglement mechanism.

Contribution

It introduces a new method to entangle color centers using quantum fluctuations in a nonequilibrium magnetic system, involving magnon-antimagnon pair creation and nonlocal dissipation.

Findings

Entanglement is achieved through magnon-antimagnon pairs in a nonequilibrium setup.

Conditions for maximal Bell state entanglement are derived.

Entanglement is absent in thermal equilibrium, highlighting the nonequilibrium nature.

Abstract

We present how entanglement between a spatially separated pair of color centers can be created by letting them weakly interact with the quantum fluctuations of a nonequilibrium magnetic environment. To this end, we consider two coupled ferromagnets, one in the ground state and one in an inverted state with respect to an applied magnetic field. The resulting energetic instability leads to a quantum spin current in the vacuum state that is sustained by the creation of magnon-antimagnon pairs at the interface. We show that these quantum fluctuations imprint a steady-state entanglement onto the two dipole-coupled color centers through nonlocal dissipation. We derive conditions for establishing a maximally entangled Bell state. This entanglement is absent in thermal equilibrium.