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Bose-Einstein Condensate
Published in Mihai V. Putz, New Frontiers in Nanochemistry, 2020
Cavity quantum optomechanics is an emerging field which controls the quantum mechanical interaction between electromagnetic radiation and bulk mechanical resonators. This field acts a boundary between quantum optics and nanoscience. The mechanical oscillator at the scale of micro- and nanometer are commonly used for a wide variety of applications. They are being normally employed as sensors or actuators in integrated optical, electrical and optomechanical systems. The optomechanical cavity is basically an optical cavity in which one of the mirrors is mechanically compliant. The simplest optomechanical system in which radiation pressure provides the dominant optomechanical coupling is a Fabry-Perot cavity with one mirror fixed and another mirror movable (Figure 5.1).
Controllable nonlinear effects in a hybrid optomechanical semiconductor microcavity containing a quantum dot and Kerr medium
Published in Journal of Modern Optics, 2019
Sonam Mahajan, Aranya B. Bhattacherjee
Entanglement plays the major role in various quantum information applications like quantum computation, quantum metrology and quantum cryptography (78–80). Recently, (81) the control of entanglement dynamics in a system of three coupled quantum oscillators had been shown. Moreover, it is possible to generate entanglement in quantum parametric oscillators using phase control (82). Also entanglement has been observed in an optomechanical system consisting of quantum well embedded inside (83). There are different methods to study the entanglement but one of the commonly used method is using Logarithmic negativity (84). In an optomechanical system, stationary entanglement implies strong correlations between phonon and photon mode. In this section, we study numerically the stationary entanglement between different modes of the system. Stationary entanglement is meaningful only when the system is in a single stable state. The system is stable when it satisfies stability conditions obtained using Routh–Hurwitz Criterion given in Appendix 2.
Progress of optomechanical micro/nano sensors: a review
Published in International Journal of Optomechatronics, 2021
Xinmiao Liu, Weixin Liu, Zhihao Ren, Yiming Ma, Bowei Dong, Guangya Zhou, Chengkuo Lee
Optomechanics has also become one of the most promising platforms for precise inertial sensing, such as accelerometers and gyroscopes. This can be mainly attributed to its possibility to detect the motion at or even below the standard quantum limit (SQL), thus making optomechanical transducers particularly suitable for weak incoherent inertial measurement. The optomechanical systems principally involve optomechanical cavities, in which radiation pressure coupling between optical and mechanical domains is greatly enhanced. As a result, the optical resonance frequency is exquisitely sensitive to mechanical motion. Furthermore, the optomechanical cavities enable an unprecedented reduction in the footprint of the sensors.
Controllable optical bistability and Fano line shape in a hybrid optomechanical system assisted by kerr medium: possibility of all optical switching
Published in Journal of Modern Optics, 2018
Aranya B. Bhattacherjee, Muhammad S. Hasan
Cavity optomechanics is a rapidly growing field of research in which a coherent coupling between the cavity optical modes and the mechanical modes of the oscillator can be achieved via the radiation pressure exerted by the trapped cavity photons [15–19]. Rapid technological advancements in this field has led to marked achievements such as ultrahigh-precision measurements [20], gravitational wave detectors [21], quantum information processing [22,23], quantum entanglement [24–26] and optomechanically induced transparency (OMIT) [27–35]. In optomechanical systems, a high degree of nonlinearity exists between the optical field and mechanical mode, which gives rise to optical bistability and multistability [34,36–38]. This optical phenomena has practical applications in all optical switching [39,40] and memory storage [41,42]. Optomechanical systems also exhibits an interesting optical phenomena called Fano resonance [43] which is based on quantum coherence and interference. Fano resonance is characterized by a sharp asymmetric line profile. Fano resonance is different from electromagnetically induced transparency (EIT) and OMIT, both of which have symmetric line profile. The asymmetry of the Fano line shape and enhanced interference effect has attracted many theoretical [44–47] as well as experimental investigations [48–51]. EIT is a quantum interference effect arising from different transition pathways of optical fields [35]. In the EIT effect, an abnormal dispersion occurs with the opening of a transparency window, resulting in slow light i.e reduction of light group velocity [52,53]. This phenomenon implies that light can be stored in atomic ensembles [54,55]. Slow light has important applications in optical networks [56], quantum networks [57] and quantum memory [58,59].