Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 33: Quantum Materials and Many-Body Systems
QI 33.5: Talk
Friday, March 22, 2024, 10:45–11:00, HFT-TA 441
Magnon-magnon quantum entanglement and the phonon effects in antiferromagnetic structure — •Yuefei Liu1, Anna Delin1, Erik Sjöqvist2, and Olle Eriksson2 — 1Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm, Sweden — 2Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Quantum correlation, such as entanglement, is a central resource in many quantum information protocols that naturally comes about in any study toward quantum technologies. This applies also to quantum magnonics. First, we investigate antiferromagnets in which sublattices with ferromagnetic interactions can have two different magnon modes, and we show how this may lead to experimentally detectable bipartite continuous variable magnon-magnon entanglement. Our current study and result not only provide original evidence for creation and observation of tunable and robust entangled quantum states of magnons in a wide range of temperature including room temperature, but also expands the magnon applications from spintronics and quantum information processing to biomedical applications. The ability to produce quantum states with tunable and robust entanglement in ambient conditions has significant implications as it would avoid costly cooling procedures, reduce the effect of thermal noise, simplify the experimental setups, and widen the range of quantum applications.
Keywords: Quantum entanglement; Magnon; Magnon-phonon interaction; Antiferromagnets