Heisenberg-limited metrology from the quantum-quench dynamics of an anisotropic ferromagnet

TL;DR

This paper demonstrates a method for Heisenberg-limited parameter estimation using quantum quench dynamics in anisotropic ferromagnets, exploiting ground-state magnon squeezing and quantum correlations for enhanced precision.

Contribution

It introduces a qubit-conditioned quantum quench protocol that utilizes ground-state magnon squeezing for quantum-enhanced metrology in magnetic systems.

Findings

Protocol achieves Heisenberg-limited precision.

Ground-state squeezing enables information extraction.

Quantum correlations are essential for the enhanced measurement.

Abstract

The emerging field of quantum magnonics seeks to understand and harness the quantum properties of magnons -- quantized collective spin excitations in magnets. Squeezed magnon states arise naturally as the equilibrium ground states of anisotropic ferromagnets and antiferromagnets, representing an important class of nonclassical magnon states. In this work, we show how a qubit-conditioned quantum quench of an anisotropic ferromagnet can be used for Heisenberg-limited parameter estimation based on measurements of the qubit only. In the presence of ground-state squeezing, the protocol yields information about the eigenmode frequency of the coupled magnon-qubit system, whereas no information is gained in the absence of such squeezing. The protocol therefore leverages genuine quantum correlations in the form of magnonic squeezing while simultaneously relying on the equilibrium character of this squeezing -- a feature distinctive to magnetic systems.