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cavity optomechanics with cold atomic gas

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Frontiers of physics 2011年第3期6卷 237-250页

作者： Ke-ye ZHANG Lu ZHOU Guang-jiong DONG Wei-ping ZHANG State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University Shanghai 200062 China

We present a tutorial review on the topics related to current development in cavity optomechanics, with special emphasis on cavity optomechanical effects with ultracold gases, Bose-Einstein condensates, and spinor Bos-Einstein condensates. Topics including the quantum model and nonlinearity of the cavity optomechanics, the principles of optomechanical cooling, radiation-pressure-induced nonlinear states, the chaotic dynamics in a condensate-mirror-hybrid optomechanical setup, and the spin-mixing dynamics controlled by optical cavities are covered.

关键词： cavity optomechanics Bose-Einstein condensate spinor Bose-Einstein condensate,optical bistability

Perfect optomechanically induced transparency in two-cavity optomechanics

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Frontiers of physics 2023年第5期18卷 245-253页

作者： Lai-Bin Qian Xiao-Bo Yan School of Physics and Electronic Engineering Northeast Petroleum UniversityDaqing 163318China

Here,we study the controllable optical responses in a two-cavity optomechanical system,especially on the perfect optomechanically induced transparency(OMIT)in the model which has never been studied before.The results show that the perfect OMIT can still occur even with a large mechanical damping rate,and at the perfect transparency window the long-lived slow light can be achieved.In addition,we find that the conversion between the perfect OMIT and optomechanically induced absorption can be easily achieved just by adjusting the driving field strength of the second cavity.We believe that the results can be used to control optical transmission in modern optical networks.

关键词： perfect optomechanically induced transparency slow light optomechanically induced absorption cavity optomechanics

Detecting nanoparticles by“listening”

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Frontiers of physics 2023年第5期18卷 113-131页

作者： Haonan Chang Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

In the macroscopic world,we can obtain some important information through the vibration of objects,that is,listening to the sound.Likewise,we can also get some information of the nanoparticles that we want to know by the means of“listening”in the microscopic world.In this review,we will introduce two sensing methods(cavity optomechanical sensing and surface-enhanced Raman scattering sensing)which can be used to detect the nanoparticles.The cavity optomechanical systems are mainly used to detect sub-gigahertz nanoparticle or cavity vibrations,while surface-enhanced Raman scattering is a well-known technique to detect molecular vibrations whose frequency generally exceeds terahertz.Therefore,the vibrational information of nanoparticles from low-frequency to high-frequency could be obtained by these two methods.The size of the viruses is at the nanoscale and we can regard it as a kind of nanoparticles.Rapid and ultrasensitive detection of the viruses is the key strategies to break the spread of the viruses in the community.cavity optomechanical sensing enables rapid,ultrasensitive detection of nanoparticles through the interaction of light and mechanical oscillators and surface-enhanced Raman scattering is an attractive qualitatively analytical technique for chemical sensing and biomedical applications,which has been used to detect the SARS-CoV-2 infected.Hence,investigation in these two fields is of vital importance in preventing the spread of the virus from affecting human’s life and health.

关键词： ultrasensitive sensing cavity optomechanics surface-enhanced Raman scattering

Realization of quantum ground state in an optomechanical crystal cavity

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 110-118页

作者： Yu Wang Zhi-Peng Shi Hong-Yi Kuang Xiang Xi Shuai Wan Zhen Shen Pi-Yu Wang Guan-Ting Xu Xiankai Sun Chang-Ling Zou Guang-Can Guo Chun-Hua Dong CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230088China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Ground-state cooling of the mechanical degree of freedom is a fundamental requirement for quantum state transfer between relevant optical and mechanical systems.Here,we fabricate optomechanical crystal cavities with co-localized mechanical and optical modes on a monolithic chip.The typical linewidth of the optical modes at telecom wavelength is as low as 0.95 GHz,and the mechanical resonant frequency is around 5 GHz,which means the optomechanical system can be operated in the resolved sideband regime.With the statistics of the asymmetry in the scattering rates of red and blue detuning driving processes,we initialize and characterize the mechanical system in its quantum ground-state of motion,with a mean thermal phonon occupancy nth=0.018±0.0034,corresponding to a mode temperature of 57.3 m K.It is a general platform for quantum state transfer between relevant optical and mechanical systems,as well as the quantum entanglement between these systems.

关键词： microcavity cavity optomechanics optomechanical crystal cavity quantum ground state

Phonon and photon lasing dynamics in optomechanical cavities

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Fundamental Research 2023年第1期3卷 37-44页

作者： Jian Xiong Zhilei Huang Kaiyu Cui Xue Feng Fang Liu Wei Zhang Yidong Huang Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China Beijing Academy of Quantum Information Science Beijing 100193China

Lasers differ from other light sources in that they are coherent,and their coherence makes them indispensable to both fundamental research and practical application.In optomechanical cavities,photon and phonon lasing is facilitated by the ability of photons and phonons to interact intensively and excite one another coherently.The lasing linewidths of both phonons and photons are critical for practical application.This study investigates the lasing linewidths of photons and phonons from the underlying dynamics in an optomechanical cavity.We find that the linewidths can be accounted for by two distinct physical mechanisms in two regimes,namely the normal regime and the reversed regime,where the intrinsic optical decay rate is either larger or smaller than the intrinsic mechanical decay rate.In the normal regime,an ultra-narrow spectral linewidth of 5.4 kHz for phonon lasing at 6.22 GHz can be achieved regardless of the linewidth of the pump light,while these results are counterintuitively unattainable for photon lasing in the reversed regime.These results pave the way towards harnessing the coherence of both photons and phonons in silicon photonic devices and reshaping their spectra,potentially opening up new technologies in sensing,metrology,spectroscopy,and signal processing,as well as in applications requiring sources that offer an ultra-high degree of coherence.

关键词： Nonlinear optics Optomechanical Crystal cavity optomechanics Phonon lasing Limit cycle

Optomechanical Schrödinger cat states in a cavity Bose-Einstein condensate

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Fundamental Research 2023年第1期3卷 15-20页

作者： Baijun Li Wei Qin Ya-Feng Jiao Cui-Lu Zhai Xun-Wei Xu Le-Man Kuang Hui Jing Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering ResearchWako-shiSaitama 351-0198Japan Laboratory of Chemical Biology&Traditional Chinese Medicine Research Ministry of Education College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China

Schrödinger cat states,consisting of superpositions of macroscopically distinct states,provide key resources for a large number of emerging quantum technologies in quantum information processing.Here we propose how to generate and manipulate mechanical and optical Schrödinger cat states with distinguishable superposition components by exploiting the unique properties of cavity optomechanical systems based on Bose-Einstein condensate.Specifically,we show that in comparison with its solid-state counterparts,almost a 3 order of magnitude enhancement in the size of the mechanical Schrödinger cat state could be achieved,characterizing a much smaller overlap between its two superposed coherent-state components.By exploiting this generated cat state,we further show how to engineer the quadrature squeezing of the mechanical mode.Besides,we also provide an efficient method to create multicomponent optical Schrödinger cat states in our proposed scheme.Our work opens up a new way to achieve nonclassical states of massive objects,facilitating the development of fault-tolerant quantum processors and sensors.

关键词： Schrödinger cat state cavity optomechanics Bose-Einstein condensate Collective density excitation Squeezing

cavity optomechanical chaos

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Fundamental Research 2023年第1期3卷 63-74页

作者： Gui-Lei Zhu Chang-Sheng Hu Ying Wu Xin-You Lü School of Physics Huazhong University of Science and TechnologyWuhan 430074China

cavity optomechanics provides a powerful platform for observing many interesting classical and quantum nonlinear phenomena due to the radiation-pressure coupling between its optical and mechanical modes.In particular,the chaos induced by optomechanical nonlinearity has been of great concern because of its importance both in fundamental physics and potential applications ranging from secret information processing to optical communications.This review focuses on the chaotic dynamics in optomechanical systems.The basic theory of general nonlinear dynamics and the fundamental properties of chaos are introduced.Several nonlinear dynamical effects in optomechanical systems are demonstrated.Moreover,recent remarkable theoretical and experimental efforts in manipulating optomechanical chaotic motions are addressed.Future perspectives of chaos in hybrid systems are also discussed.

关键词： cavity optomechanics Chaos Nonlinear dynamics Bistability Period-doubling bifurcation

Entanglement of two Jaynes-Cummings atoms in single-excitation space

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Communications in Theoretical Physics 2021年第2期73卷 52-58页

作者： Ya Yang Yan Liu Jing Lu Lan Zhou Key Laboratory of Low Dimensional Quantum Strncures and Quantum Control of Ministry of Education Department of Phlysics and Synergetic Innovation Center of Quantum Effects and ApplicationsKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China Collge of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China

We study the entanglement dynamics of two atoms coupled to their own Jaynes-Cummings cavities in single-excitation space.Here,we use concurrence to measure atomic entanglement,and consider the Bell-like states to be initial states.Our analysis suggests that collapse and revival take place in entanglement dynamics.The physical mechanism behind entanglement dynamics is periodic information and energy exchange between atoms and light fields.For the initial Bell-like states,evolutionary periodicity of the atomic entanglement can only be found if the ratio of the two atom-cavity coupling strengths is a rational number.Also,whether there is a time translation between two kinds of initial Bel-like state depends on odd versus even numbers of the coupling strength ratio.

关键词： cavity optomechanics Jaynes-Cummings cavities single excitation entanglement dynamics

Remote weak-signal measurement via bound states in optomechanical systems

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Communications in Theoretical Physics 2021年第2期73卷 59-67页

作者： Xun Li Biao Xiong Shilei Chao Chengsong Zhao Hua-Tang Tan Ling Zhou National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid PhysicsChinaAcademy of Engineering PhysicsMianyang 621900China School of Physics Dalian University of technologyDalian 116026China Department of Physics Huazhong Normal UniversityWuhan 430079China

A scheme for remote weak-signal sensors is proposed,in which a coupled-resonator optical waveguide(CROW),as a transmitter,couples to a hybrid optomechanical cavity and an observing cavity at its two ends.Non-Markovian theory is employed to study the weak-force sensor by treating the CROW as a non-Markovian reservoir of cavity fields.The dissipationless bound states in the non-Markovian regime are conducive to remotely transmitting a signal in the CROW.Our results show that a sensor with ultrahigh sensitivity can be achieved with the assistance of bound states under certain parameter regimes.

关键词： non-Markovian environment remote force detection cavity optomechanics