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

• URL: http://arxiv.org/abs/2512.23606v1
• Date: Mon, 29 Dec 2025 17:01:00 GMT
• Title: Heisenberg-limited metrology from the quantum-quench dynamics of an anisotropic ferromagnet
• Authors: Z. M. McIntyre, Ji Zou, Jelena Klinovaja, Daniel Loss,
• Abstract summary: We show how a qubit-conditioned quantum quench of an anisotropic ferromagnet can be used for Heisenberg-limited parameter estimation.<n>In the presence of ground-state squeezing, the protocol yields information about the eigenmode frequency of the coupled magnon-qubit system.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

Related papers

• Revealing the non-classicality of a molecular nanomagnet [41.99844472131922]
  Molecular nanomagnets are compounds characterized by a high-spin magnetic core that is protected by organic regimes.<n>They have recently gained attention as potential quantum information carriers in solid-state quantum computing platforms.<n>We address the quantumness of molecular nanomagnets using a recently formulated criterion.
  arXiv  Detail & Related papers  (2026-01-19T08:44:41Z)
• Circuit-based cavity magnonics in the ultrastrong and deep-strong coupling regimes [0.0]
  We study nonperturbative strong-coupling phenomena in cavity magnonics systems.<n>We show that a nontrivial frequency shift emerges in the ultrastrong and deep-strong coupling regimes.<n>This work paves the way for cavity magnonics beyond the conventional strong coupling regime.
  arXiv  Detail & Related papers  (2025-10-23T01:35:55Z)
• Squeezing and quantum control of antiferromagnetic magnon pseudospin [0.0]
  Antiferromagnets host coherently coupled magnonic excitations forming a magnon pseudospin.<n>We find strong squeezing of the magnon pseudospin highlighting its important role in determining the eigenmode quantum properties.<n>Our results are applicable to any system of coupled bosons and thus introduce quantum fluctuations engineering of a general bosonic pseudospin.
  arXiv  Detail & Related papers  (2025-06-06T13:18:44Z)
• Harnessing Chiral Spin States in Molecular Nanomagnets for Quantum Technologies [44.1973928137492]
  We show that chiral qubits naturally suppress always-on interactions that can not be switched off in weakly coupled qubits.<n>Our findings establish spin chirality engineering as a promising strategy for mitigating always-on interaction in entangling two chiral qubits in molecular quantum technologies.
  arXiv  Detail & Related papers  (2025-01-21T08:23:12Z)
• Resolving nonclassical magnon composition of a magnetic ground state via a qubit [44.99833362998488]
  We show that a direct dispersive coupling between a qubit and a noneigenmode magnon enables detecting the magnonic number states' quantum superposition. This unique coupling is found to enable control over the equilibrium magnon squeezing and a deterministic generation of squeezed even Fock states.
  arXiv  Detail & Related papers  (2023-06-08T09:30:04Z)
• Full counting statistics as probe of measurement-induced transitions in the quantum Ising chain [62.997667081978825]
  We show that local projective measurements induce a modification of the out-of-equilibrium probability distribution function of the local magnetization. In particular we describe how the probability distribution of the former shows different behaviour in the area-law and volume-law regimes.
  arXiv  Detail & Related papers  (2022-12-19T12:34:37Z)
• Bell-state generation for spin qubits via dissipative coupling [3.011018394325566]
  We investigate the dynamics of two spin qubits interacting with a magnetic medium. We show how a sizable long-lived entanglement can be established via the magnetic environment. Our study may find applications in quantum information science, quantum spintronics, and for sensing of nonlocal quantum correlations.
  arXiv  Detail & Related papers  (2021-08-16T22:36:48Z)
• Quantum simulation of antiferromagnetic Heisenberg chain with gate-defined quantum dots [0.0]
  Magnetic phases naturally arise in the Mott-insulator regime of the Fermi-Hubbard model. We show the quantum simulation of magnetism in the Mott-insulator regime with a linear quantum-dot array.
  arXiv  Detail & Related papers  (2021-03-15T09:45:02Z)
• Non-equilibrium stationary states of quantum non-Hermitian lattice models [68.8204255655161]
  We show how generic non-Hermitian tight-binding lattice models can be realized in an unconditional, quantum-mechanically consistent manner. We focus on the quantum steady states of such models for both fermionic and bosonic systems.
  arXiv  Detail & Related papers  (2021-03-02T18:56:44Z)
• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices [62.997667081978825]
  We study the effects of cavity mediated long range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. These allow new alternatives toward the design of robust mechanisms for quantum information purposes.
  arXiv  Detail & Related papers  (2020-11-16T08:03:44Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.