Quantum-enhanced metrology in cavity magnonics

Year: 2024

Authors: Wan QK., Shi HL., Guan XW.

Autors Affiliation: Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, Wuhan 430071, Peoples R China; Univ Chinese Acad Sci, Beijing 100049, Peoples R China; QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; CNR, INO, Largo Enr Fermi 2, I-50125 Florence, Italy; Hefei Natl Lab, Hefei 230088, Peoples R China; NSFC SPTP Peng Huanwu Ctr Fundamental Theory, Xian 710127, Peoples R China; Australian Natl Univ, Res Sch Phys, Dept Fundamental & Theoret Phys, Canberra, ACT 0200, Australia.

Abstract: Magnons, as fundamental quasiparticles that emerge in elementary spin excitations, hold a big promise for innovating quantum technologies in information coding and processing. By establishing the exact relation between Fisher information and entanglement in partially accessible metrological schemes, we rigorously prove that bipartite entanglement plays a crucial role during the dynamical encoding process. However, the presence of an entanglement during the measurement process unavoidably reduces the ultimate measurement precision. These findings are verified in an experimentally feasible cavity magnonic system engineered for detecting a weak magnetic field by performing precision measurements through the cavity field. Moreover, we further demonstrate that, within a weak-coupling region, measurement precision can reach the Heisenberg limit. Additionally, quantum criticality also enables us to enhance measurement precision in a strong-coupling region.

Journal/Review: PHYSICAL REVIEW B

Volume: 109 (4)      Pages from: L041301-1  to: L041301-8

More Information: We thank J. Yang, X.-H. Wang, and Y.-G. Su for valuable comments and suggestions. This work was supported by NSFC Key Grants No. 92365202 and No. 12134015 and by NSFC Grants No. 11874393 and No. 12121004. H.-L.S. was supported by the European Commission through the H2020 QuantERA ERA-NET Cofund in Quantum Technologies project MENTA. The authors Q.-K.W. and H.-L.S. contributed equally to this work.
KeyWords: Squeezed States; Entanglement; Equilibrium; System
DOI: 10.1103/PhysRevB.109.L041301

Citations: 6
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