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Enhanced entanglement and asymmetric EPR steering between magnons

Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 55-63页

作者： Sha-Sha Zheng Feng-Xiao Sun Huai-Yang Yuan Zbigniew Ficek Qi-Huang Gong Qiong-Yi He State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics School of Physics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing100871China Beijing Academy of Quantum Information Sciences Beijing100193China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China Institute for Theoretical Physics Utrecht University3584CCUtrechtThe Netherlands Quantum Optics and Engineering Division Institute of PhysicsUniversity of Zielona GóraZielona Góra65-516Poland

The generation and manipulation of strong entanglement and einstein-podolsky-rosen(EPR)steering in macroscopic systems are outstanding challenges in modern ***,the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties are highly ***,we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light *** the absence of light,the two types of magnons on the two sublattices can be entangled,but no quantum steering occurs when they are damped with the same *** the presence of the cavity field,the entanglement can be significantly enhanced,and strong two-way asymmetric quantum steering appears between two magnons with equal *** is very different from the conventional protocols to produce asymmetric steering by imposing additional unbalanced losses or noises on the two parties at the cost of reducing *** essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity *** finding may provide a novel platform to manipulate the quantum steering and the detection of bi-party steering provides a knob to probe the magnetic damping on each sublattice of a magnet.

关键词： quantum information magnon entanglement einstein-podolsky-rosen steering cavity induced cooling

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