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Nonreciprocity in a strongly coupled three-mode optomechanical circulatory system
摘要： In this work, we propose a scheme in three-mode optical systems to simulate a strongly coupled optomechanical system. The nonreciprocity observed in such a three-mode optomechanical circulatory system (OMCS) is explored. To be speci?c, we ?rst derive a quantum Langevin equation (QLE) for the strongly coupled OMCS by suitably choosing the laser ?eld, then we give a condition for the frequency of the laser and the mechanical decay rate, beyond which the optomechanical system has a unidirectional transmission regardless of how strong the optomechanical coupling is. The optomechanically induced transparency is also studied. The present results can be extended to a more general two-dimensional optomechanical system and a planar quantum network, and the prediction is possible to be observed in an optomechanical crystal or integrated quantum superconducting circuit. This scheme paves a way for the construction of various quantum devices that are necessary for quantum information processing.
关键词： Nonreciprocity,quantum Langevin equation,optomechanically induced transparency,quantum information processing,optomechanical circulatory system
更新于2025-09-12 10:27:22
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Effect of the mechanical oscillator on the optical-response properties of an optical trimer system
摘要： We propose theoretically a four-mode coupled optomechanical system to explore the optical-response properties of an optical trimer system consisting of a passive cavity, a no-loss-gain cavity, and an active cavity coupled with a mechanical oscillator. In the study, the passive cavity is driven by an external laser so that the stability of the coupled system depends strongly on the gain-to-loss ratio and the photon tunneling between the adjacent cavities. We ?nd that in the regime near the stable-unstable critical point, the resonance absorption of the optical trimer system changes quickly with the increasing gain of the active cavity. In contrast, when the mechanical oscillator is coupled to the passive cavity, the center absorption peak is split and a phenomenon of optomechanically induced transparency appears. Consequently, two additional resonance peaks in the absorption pro?le are induced by the optomechanical coupling, which hinges on the tunneling between the optical cavities and also on the gain of the active cavity. The dependence of the width of the transparency window on the optomechanical coupling and the driving strength is also discussed in detail. The results obtained here indicate that the optical properties of the trimer system can be manipulated by coupling a mechanical oscillator to the system and therefore have a potential application in quantum optics and quantum information processing.
关键词： optomechanically induced transparency,quantum information processing,mechanical oscillator,quantum optics,optomechanical system,optical trimer system
更新于2025-09-09 09:28:46
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Enhanced optomechanically induced transparency with magnetic coupling
摘要： Optomechanically induced transparency is a kind of induced transparency arising from the interference of excitation pathways in optomechanical systems and can be used to realize high speed optical switches and precision measurements. Due to the intrinsic feature of optomechanical interaction, optomechanically induced transparency can only be observed under strong pump fields. However, the applications of optomechanically induced transparency in nanophotonics require low pump power and good controllability. Thus it is important to reduce the pump power and improve the controllability of optomechanically induced transparency with current experimental parameters. In this work, we propose a realizable method for the achievement of low-power optomechanically induced transparency by introducing a magnetic force coupling. We show that the magnetic coupling can obviously reduce the pump threshold value, and optomechanically induced transparency with ultralow pump threshold value and desirable controllability can be realized. In comparison to optomechanical system combining piezoelectric materials, the magnetic force-coupled optomechanical system may be a better candidate for optical information process.
关键词： optomechanically induced transparency,low-power,optical switches,precision measurements,magnetic coupling
更新于2025-09-09 09:28:46