Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.4: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Entanglement and Dissipation in Quantum Spin Systems — •Jakob Wagner, Daniel K. J. Boneß, and Wolfgang Belzig — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Squeezing in quantum systems allows the reduction of quantum fluctuations in one observable of interest at the cost of enhanced uncertainty in its conjugate. Spin systems common in magnonics naturally exhibit squeezing [1, 2]. Generally, dissipation changes the amount of squeezing, possibly also amplifying it [3, 4]. Here, we relate the effects of dissipation in spin systems to linearized bosonic systems. We extend previous considerations by assuming a general linear system-bath coupling. Associating the position coordinate of the bosonic system with spin fluctuations in one direction, as well as the momentum coordinate with the orthogonal direction we demonstrate the equivalence of the Landau-Lifschitz-Gilbert equation to an unconventionally damped harmonic oscillator. We demonstrate several coupling dependent effects like control of the squeezing direction and modified entanglement properties. Our results thus give new controls over decoherence in magnonic systems via engineered dissipation.

[1] A. Kamra et al, Phys. Rev. B 100, 174407 (2019)

[2] D. Wuhrer et al, Appl. Phys. Lett. 125, 022404 (2024)

[3] G. Rastelli, New. J. Phys. 18, 053033 (2016)

[4] H. Y. Yuan et al, Phys. Rev. B 106, 224422 (2022)

Keywords: Unconventional dissipation; Magnonic squeezing; Entanglement; Antiferromagnets; Engineered dissipation