Generation of optical-photon-and-magnon entanglement in an optomagnonics-mechanical system
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Generation of optical-photon-and-magnon entanglement in an optomagnonics-mechanical system Zhi-Bo Yang1,2 · Rong-Can Yang1,3
· Hong-Yu Liu2
Received: 2 April 2020 / Accepted: 11 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We present a scheme to implement a steady optical-photon-and-magnon entanglement in a hybrid optomagnonics-mechanical system by adiabatical elimination of the auxiliary microwave (MW) cavity and effective laser cooling of a delocalized Bogoliubov mode. The system consists of a magnon, an optical and a MW cavities, and a mechanical vibrator. To achieve a direct entangling interaction between the magnon and the optical photon, we drive the optical cavity and magnon at the red and blue sideband associated with the mechanical resonator, respectively. In particular, by eliminating the MW cavity and optimizing the relative ratio of effect couplings, rather than merely increasing their magnitudes, we achieve a strong entanglement between optical photons and magnons. Keywords Hybrid optomagnonics-mechanical system · Adiabatical elimination · Delocalized Bogoliubov mode · Entanglement
1 Introduction In quantum science, a variety of quantum states serve as a “quantum resource” for information processing [1–3]. As a special type of quantum states, quantum entanglement is widely used in information processing, such as quantum key distribution [4– 6], quantum dense coding [7,8], quantum teleportation [9,10], quantum entangled
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Rong-Can Yang [email protected] Hong-Yu Liu [email protected]
1
Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, and College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China
2
Department of Physics, College of Science, Yanbian University, Yanji 133002, Jilin, China
3
Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen 361005, China 0123456789().: V,-vol
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codes [11,12], quantum computation [13,14], and quantum communication [15,16]. In recent years, preparation of entangled states in ferromagnetic systems, especially with the help of yttrium iron garnet (YIG) spheres, has attracted considerable interest. It has been found that Kittel modes [17] of YIG sphere can be strongly coupled with MW photons in a high-quality cavity, leading to the cavity polaritons [18–20], vacuum Rabi splitting and so on. The phenomenon is then called magnon cavity quantum electrodynamics (QED) [21–25]. Since then, several exciting developments, such as observation of bistability [26] and coupling of a single superconducting qubit to the Kittel mode [17,27], have been made. The magnon-photon system can provide a new platform for us to study the unique effect of strong coupling QED, where magnons are very similar to superconducting qubits [28], semiconductor qubits [29–31], and double quantum dots [32]. Besides, YIG spheres have a slight loss for various different information carriers, including
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