Generation of spin-squeezed states using dipole-coupled spins

TL;DR

This paper explores how dipole-coupled spins in solid-state or molecular systems can be used to generate spin-squeezed states, which are beneficial for enhancing quantum sensing sensitivity and detecting entanglement.

Contribution

It demonstrates, through simulation, that magnetic dipole interactions in spin systems can produce spin-squeezed states and discusses potential experimental realizations.

Findings

Dipole-coupled spins can generate spin-squeezed states.

Squeezed states are a form of entanglement.

Potential for improved quantum sensor networks.

Abstract

Spins in solids and molecules are promising for applications of quantum sensing technology. The sensitivity of the quantum sensing depends on how precisely spin observables can be determined in the measurement, and is intrinsically limited by the uncertainties of the observables. The use of a spin-squeezed state in a quantum sensor can reduce the uncertainty below the standard quantum limit when combined with an appropriate measurement procedure. Here, we discuss the simulation study of the generation of a squeezed state in an interacting spin system. We show that a spin system coupled by the magnetic dipole interaction can create a squeezed state. Model systems to realize the spin squeezing experimentally are also discussed. In addition, we find that a squeezed state is a type of entangled state. The present work paves the way to realize a squeezed state using a spin system to build a quantum sensor network with improved sensitivity, and to use it for the detection of quantum entanglement.