Enhanced entanglement and asymmetric EPR steering between magnons
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January 2021 Vol. 64 No. 1: 210311 https://doi.org/10.1007/s11433-020-1587-5
Enhanced entanglement and asymmetric EPR steering between magnons Sha-Sha Zheng1,2,3, Feng-Xiao Sun1,2,3, Huai-Yang Yuan4, Zbigniew Ficek5, Qi-Huang Gong1,2,3, and Qiong-Yi He1,2,3* 1 State
Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics, School of Physics & Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China; 2 Beijing Academy of Quantum Information Sciences, Beijing 100193, China; 3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China; 4 Institute for Theoretical Physics, Utrecht University, 3584CC Utrecht, The Netherlands; 5 Quantum Optics and Engineering Division, Institute of Physics, University of Zielona G´ ora, Zielona G´ora 65-516, Poland Received April 26, 2020; accepted June 1, 2020; published online August 20, 2020
The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen (EPR) steering in macroscopic systems are outstanding challenges in modern physics. Especially, 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 asymmetric. Here, we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light system. In 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 rates. In 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 dissipation. This 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 steerability. The essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity photons. Our 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. quantum information, magnon, entanglement, Einstein-Podolsky-Rosen steering, cavity induced cooling PACS number(s): Citation:
03.67.-a, 03.65.Ud, 03.67.Bg
S.-S. Zheng, F.-X. Sun, H.-Y. Yuan, Z. Ficek, Q.-H. Gong, and Q.-Y. He, Enhanced entanglement and asymmetric EPR steering between magnons, Sci. China-Phys. Mech. Astron. 64, 210311 (2021), https://doi.org/10.1007/s11433-020-1587-5
1 Introduction Hybridizing two or more quantum systems, aiming at combining complementary functionalities of distinct systems to obtain multitasking capabilities, is very necessary and crucial for implementing quantum information processing [1]. *Corresponding author (email: [email protected])
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