Almut Beige, Antonio Capolupo, Andreas Kurcz, Emilio Del Giudice, Giuseppe Vitiello
We present a mechanism of energy concentration in a system composed by an optical cavity and a large number of strongly confined atoms, which cannot be described in the rotating wave approximation. The mechanism consists in the emission of photons through the cavity mirrors even in the absence of external driving.
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We address an experimental scheme to analyze the optical bistability and the entanglement of two movable mirrors coupled to a two-mode laser inside a doubly resonant cavity. With this aim we investigate the master equations of the atom-cavity subsystem in conjunction with the quantum Langevin equations that describe the interaction of the mirror cavity. The parametric amplification-type coupling induced by the two-photon coherence on the optical bistability of the intracavity mean photon numbers is found and investigated. Under this condition, the optical intensities exhibit bistability for al…
Non-Hermitian Waveguide Cavity QED with Tunable Atomic Mirrors
本文研究了由可调原子二聚体镜构成的开放腔，发现其具有反$\mathcal{PT}$对称性及简并超模，并确定了实现强相干腔-原子耦合的反射阈值，为量子光学与计算提供了非厄米理论。
We analyze the behaviour of a coherent field driving a single mode optical cavity with one perfectly reflecting moving mirror and a partially reflecting fixed mirror, and show that this system's output exhibits optical bistability due to radiation pressure acting over the moving mirror.
Entanglement of a Laguerre-Gaussian cavity mode with a rotating mirror
先前已经从理论上证明，光学腔中的光场与振动的端镜之间的线性动量交换可以使电磁场与该镜的振动运动纠缠。在本文中，我们考虑这种情况的旋转模拟，并表明辐射扭矩可以类似地纠缠拉盖尔-高斯腔模式与旋转端镜。我们研究了镜场纠缠作为环境温度，辐射失谐量和腔模携带的轨道角动量的函数。
We investigate a hybrid optomechanical system comprised of a mechanical oscillator and an atomic 3-level ensemble within an optical cavity. We show that a suitably tailored cavity field response via Electromagnetically Induced Transparency (EIT) in the atomic medium allows for strong coupling of the mechanical mirror oscillations to the collective atomic ground-state spin. This facilitates ground-state cooling of the mirror motion, quantum state mapping and robust atom-mirror entanglement even for cavity widths larger than the mechanical oscillator frequency.
The entanglement of the two movable mirrors in a single mode cavity field is studied in an ideal situation without thermal noise. When gn/w <<1 where g is the coupling coefficient between the mirror and the field, w is the mirror' vibration frequency and n is photon number of the cavity field, we work out Wootters concurrence of the system initially with the field in Fock number state and the two mirrors in vacuum states, and find that the states of the mirrors are entangled into space spanned by |0>,|1> via radiation pressure, though the concurrence is very small.
We consider the dynamics of a movable mirror (cantilever) of a nonlinear optical cavity. We show that a $χ^{(3)}$ medium with a strong Kerr nonlinearity placed inside a cavity inhibits the normal mode splitting (NMS) due to the photon blockade mechanism. This study demonstrates that NMS could be used as a tool to observe the photon blockade effect. We also found that the backaction cooling of the movable mirror is reduced in the presence of the Kerr medium.
We investigate the response of a harmonically confined mirror to an optical pulse in cavity optomechanics. We show that when the pulsed coupling strength takes the form of a chirped pulse, thermal fluctuations of the mirror can be significantly transferred to the cavity field. In addition, the frequency modulation of the pulse could enable a better cooling performance by suppressing the sensitivity of the dependence of detuning and pulse areas. Using numerical investigations, we find that the pulsed-cooling is mainly limited by the cavity-field decay rate.
Characterization of high finesse mirrors: loss, phase shifts and mode structure in an optical cavity
描述了腔QED实验中所用的高精细度光学腔的广泛表征。不同的技术在测量的损失和相移与反射镜涂层进行了讨论，并显示其协议。介电涂层支持的腔场模式结构的问题与我们实现原子与腔之间最强耦合的努力有关。
We propose a method to generate quadrature squeezed states of a moving mirror in a Fabry-Perot cavity. This is achieved by exploiting the fact that when the cavity is driven by an external field with a large detuning, the moving mirror behaves as a parametric oscillator. We show that parametric resonance can be reached approximately by modulating the driving field amplitude at a frequency matching the frequency shift of the mirror. The parametric resonance leads to an efficient generation of squeezing, which is limited by the thermal noise of the environment.
Stationary entanglement between two movable mirrors in a classically driven Fabry-Perot cavity
本文研究了由两个移动反射镜构成的法布里-珀罗腔，腔体受强经典激光场驱动。我们表明，通过辐射压力可以产生镜子两个振动模式之间的稳态纠缠，有效质量为微克量级。然而，所产生的纠缠相对于温度是相当脆弱的。
Emergence of atom-light-mirror entanglement inside an optical cavity
我们提出了一个方案，用于实现一个混合的，强量子关联系统形成的原子系综周围的高精细光学腔与振动镜。我们表明，该系统的稳定状态显示三分和二分连续变量纠缠在实验上可访问的参数制度，这是对温度的鲁棒性。
Integrating cavity quantum electrodynamics and ultracold-atom chips with on-chip dielectric mirrors and temperature stabilization
我们制作了一个原子芯片器件，它结合了冷原子磁捕获电路和适用于单原子强耦合腔QED的高精细度光学谐振腔。在横向尺寸< 100 μ m的微图案化片上平面镜和悬置在芯片上方的曲面镜之间形成精细度F > 2 × 10^5的法布里-珀罗光学谐振器。在原子芯片的模拟操作期间，利用片上电元件和光学元件之间的强且快速的热耦合来稳定伺服带宽超过100 kHz的腔镜分离。
Entangling movable mirrors in a double cavity system
我们提出了一种双腔装置，能够在低温下产生两个可移动镜的静态纠缠态。该方案是基于输入光场的压缩到镜的机械振动模式的最佳转换，实现了腔内光的辐射压力。我们表明，宏观纠缠的存在，可以证明适当的读出的两个腔的输出光。
We investigate the squeezing for a movable mirror in the dissipative optomechanics in which the oscillating mirror modulates both the resonance frequency and the linewidth of the cavity mode. Via feeding a much weaker broadband squeezed vacuum light accompanying the coherent driving laser field into the cavity, the master equation for the cavity-mirror system is derived by following the general reservoir theory based on the density operator in which the reservoir variables are adiabatically eliminated by using the reduced density operator for the system in the interaction picture. When the mir…
The generation of quantum entanglement of macroscopic or mesoscopic bodies in mechanical motion is generally bounded by the thermal fluctuation exerted by their environments. Here we propose a scheme to establish stationary entanglement between two mechanically oscillating mirrors of a cavity. It is revealed that, by applying a broadband squeezed laser acting as a squeezed-vacuum reservoir to the cavity, a stable entanglement between the mechanical mirrors can be generated. Using the adiabatic elimination and master equation methods, we analytically find that the generated entanglement is esse…
Phase noise measurement in a cavity with a movable mirror undergoing quantum Brownian motion
研究了受量子布朗运动影响的可动镜腔中光模的动力学行为。我们研究了输出光的相位噪声功率谱，并利用量子朗之万方法描述了导致热噪声贡献的镜像布朗运动。我们表明，标准的量子朗之万方程，补充适当的非马尔可夫关联函数，提供了一个充分的描述布朗运动。
Quantum super-cavity with atomic mirrors
我们研究了耦合微腔阵列中的单光子输运，其中两个二能级原子系统嵌入在阵列的两个单独的腔中。我们发现单光子可以被一个二能级系统全反射。然而，两个独立的二能级系统也可以在它们之间产生单光子准束缚态。因此，腔阵列中的单个两级系统可以充当反射镜，而不同类型的腔可以通过在阵列中的两个单独的腔内部使用充当可调谐“反射镜”的两个两级系统来形成。类似于固态的超晶格，我们称这种新的“耦合腔阵列中的腔”为超腔。这种超腔是法布里-珀罗干涉仪的量子模拟。此外，我们还证明了这种量子超腔的物理性质可以通过改变这些二能级系统的频率来调节。
We investigate the optical behavior of a single Laguerre-Gaussian cavity optomechanical system consisting of two mechanically rotating mirrors. We explore the effects of various physical parameters on the double optomechanically induced transparency (OMIT) of the system and provide a detailed explanation of the underlying physical mechanism. We show that the momentum is not the cause of the current double-OMIT phenomena; rather, it results from the orbital angular momentum between the optical field and the rotating mirrors. Additionally, the double-OMIT is simply produced using a single Laguer…
Quantum statistical properties of the radiation field in a cavity with a movable mirror
研究了腔场与可动镜相互作用系统的量子统计特性。这样的系统在原理上可以作为一个理想化的仪表，用于检测耦合到由量子谐振子建模的镜子的弱经典力。它表明，标准的量子限制的测量的镜子的位置自然产生的系统在其动力学演化过程中的属性。然而，该系统的力检测灵敏度达不到相应的标准量子极限。我们还研究了运动镜与辐射压力之间的非线性相互作用对初始相干腔场正交涨落的影响。
By tightly focussing a laser field onto a single cold ion trapped in front of a far-distant dielectric mirror, we could observe a quantum electrodynamic effect whereby the ion behaves as the optical mirror of a Fabry-Pérot cavity. We show that the amplitude of the laser field is significantly altered due to a modification of the electromagnetic mode structure around the atom in a novel regime in which the laser intensity is already changed by the atom alone. e propose a direct application of this system as a quantum memory for single photons.
We demonstrate the steady-state entanglement of two two-level atoms inside a pumped cavity with photon leakage through a nonlinear mirror and through spontaneous decay, and show that the entanglement is enhanced by the presence of a nonlinear mirror. Our model assumes the vacuum Rabi splitting of the dressed states of the system to be much larger than any of the decay parameters of the system. We also discuss how the dressed states of the system offer us intuition as to where the entanglement lies in the state space spanned by the system, and allow us the optimize the system.
Optomechanical entanglement between a movable mirror and a cavity field
我们展示了如何利用辐射压力在光腔场模和宏观振动镜之间产生稳态纠缠。我们还展示了如何产生的光机纠缠可以量化，我们提出了一个实验读出方案，充分表征纠缠态。令人惊讶的是，这种光机纠缠显示出持久的环境温度高于20 K，使用国家的最先进的实验参数。
Optomechanical systems have been attracting intensive attention in various physical experiments. With an optomechanical system, the displacement of or the force acting on a mechanical oscillator can be precisely measured by utilizing optical interferometry. As a mechanical oscillator, a suspended mirror is often used in over milligram scale optomechanical systems. However, the tiny suspended mirror in a linear cavity can be unstable in its yaw rotational degree of freedom due to optical radiation pressure. This instability curbs the optical power that the cavity can accumulate in it, and impos…
In this paper we describe a scheme for state transfer between a trapped atomic Bose condensate and an optomechanical end-mirror mediated by a cavity field. Coupling between the mirror and the cold gas arises from the fact that the cavity field can produce density oscillations in the gas which in turn acts as an internal Bragg mirror for the field. After adiabatic elimination of the cavity field we find that the hybrid system of the gas and mirror is described by a beam splitter Hamiltonian that allows for state transfer, but only if the quantum nature of the cavity field is retained.
Enhanced entanglement and controlling quantum steering in a Laguerre-Gaussian cavity optomechanical system with two rotating mirrors
该研究在含光学参量放大器的拉盖尔-高斯旋转腔光机系统中，通过调节参量增益、相位和旋转镜频率，增强了镜-镜及镜-腔纠缠并实现三部分纠缠，同时发现量子导引方向性由旋转镜频率决定，呈现单向或双向不对称性，有助于非局域关联理解与纠缠验证。
Ray chaos in optical cavities based upon standard laser mirrors
我们提出了一种由标准激光反射镜组成的复合光学腔，该腔由稳定腔和非稳定腔的适当组合组成。尽管其非常开放的性质的复合腔显示射线混沌，这可能是软或硬，这取决于腔的配置。这为混沌波场的量子方面的实验研究开辟了一条新的、方便的途径。
Quantum radiation in a plane cavity with moving mirrors
在非相对论近似下，研究了带有运动反射镜的理想平面腔中的真空电磁场。我们表明，低频光子产生的对，满足简单的属性与平面几何形状。我们计算的光子产生率为每个偏振的机械频率的函数由两个独立的方法：一方面从移动的镜子的边界条件的分析，并与格林函数的帮助下，另一方面通过一个有效的哈密顿方法。的角度和频率谱是离散的，并获得每个允许的角方向的发射率。我们讨论了产生率对腔长的依赖关系，并表明短腔长的效果增强。我们还计算了运动镜上的耗散力，并表明它与能量守恒所预测的总辐射能量有关。
A hemispherical, high-solid-angle optical micro-cavity for cavity-QED studies
我们报道了一种新颖的半球形微腔，它是由一个平面集成半导体分布式布拉格反射镜（DBR）的反射镜，和外部，凹面微镜具有曲率半径$50\mathrm{μm}$。包含量子点（QD）的集成DBR镜被设计成将QD定位在场的波腹处，以便最大化QD与腔之间的相互作用。凹面微镜在大立体角范围内具有高反射率，在平面镜处产生衍射极限（亚微米）模腰，导致腔模与量子点之间的大耦合常数。相对于全单片结构，半单片设计提供了更多的空间和光谱调谐能力。这种独特的微腔设计将有可能使我们既达到腔量子电动力学（QED）强耦合制度，并实现单光子的确定性产生的需求。
We investigate the dynamical Casimir effect and its detection with Rydberg atoms. The photons are created in a resonant cavity with a plasma mirror of a semiconductor slab which is irradiated by periodic laser pulses. The canonical Hamiltonian is derived for the creation and annihilation operators showing the explicit time-variation in the couplings, which originates from the external configuration such as a nonstationary plasma mirror. The number of created photons is evaluated as squeezing from the Heisenberg equations with the Hamiltonian. Then, the detection of the photons as the atomic ex…
Preparation of Nonclassical States in Cavities with a Moving Mirror
我们描述了一个由腔场与可移动的反射镜相互作用组成的量子系统如何被用来产生大量的各种各样的腔场和反射镜的非经典态。首先我们考虑腔场的态制备。系统动力学将在多分量薛定谔猫态中准备一个单模的腔场，其方式与克尔介质中的类似。此外，当两个或更多个腔模与反射镜相互作用时，它们可以在纠缠态中制备，该纠缠态可以被视为偶相干态和奇相干态的多模概括。我们还表明，近数的一个单一的模式的状态可以通过执行的位置的测量的镜子。其次，我们考虑了镜的态制备，并证明了通过光场的正交测量可以将这个宏观物体置于薛定谔猫态。此外，我们研究的阻尼的运动的镜子上的腔场状态的效果，并比较这与腔场阻尼的效果。
We investigate a double cavity optomechanical system(OMS) generating single and double Fano resonance(multi Fano). By altering a single parameter, the tunneling rate $g$ of the middle mirror, we are able to switch between single and double Fano line shapes. The first spectral line shape is stronger in the case of multi Fano than in the case of single Fano. Also the behaviour of steady state value of the displacement of the middle mirror with respect to $g$, heavily influences the behaviour of double Fano lines in our scheme. This tunability along-with using a single pump and signal/probe laser…
While the levitating mirror has seen renewed interest lately, relatively little is known about its quantum behaviour. In this paper we present a quantum theory of a one dimensional levitating mirror. The mirror forms a part of a Fabry-Perot cavity where the circulating intracavity field supports the mirror through radiation pressure alone. We find a blue and red detuned steady-state of which only the blue detuned solution with damping on the mirror and cavity is stable. We find strong entanglement (15-20 ebits) between the mirror output and cavity output and squeezing in the mirror position.
Photon Anomalous Blockade in Waveguide Cavity QED with Atomic Mirrors
本文研究了波导腔量子电动力学系统中输出场的光子统计特性，发现即使在损耗大、耦合弱的波导腔中，光子阻塞现象仍可能发生，这与传统光子阻塞或非传统量子干涉在腔QED系统中的条件不同。通过主方程和散射理论推导了弱驱动系统中光子阻塞的条件，发现这种异常光子阻塞是由量子芝诺效应引起的，并且对腔内介质原子位置的变化具有鲁棒性。
Cavity optomechanical coupling assisted by an atomic gas
我们从理论上研究了一个充满原子的腔，它提供了修改后的腔光场与一端可移动的反射镜之间的光机相互作用。我们表明，腔场“打扮”这些原子，产生两种类型的极化激元，有效地提高了辐射压力的腔场的端镜，以及建立一个额外的压缩模式的端镜。这种压缩在振荡镜和系统的其余部分之间产生绝热纠缠，这在通常的真空腔中是不存在的。我们分析了纠缠，并量化它使用Loschirton回声和保真度。
The present paper illustrates the realization of an atom-optomechanical system where an atomic ensemble is confined in a ring optomechanical cavity consisting of a fixed mirror and two movable ones. An analysis of the dynamics and the linearization of the equations allows to derive the multimode covariance matrix. Under realistic experimental conditions, we numerically simulate the steady-state bipartite and tripartite continuous variable entanglement using the logarithmic negativity, and analyze the shared entanglement in the multimode system. The introduction of the atomic medium allows to o…
Effective models for quantum optics with multilayer open cavities
针对开放腔动力学模型多唯象处理泄漏的问题，本文通过第一性原理推导考虑腔镜纵向结构的腔-库耦合函数与广义响应函数，定义多层镜腔的有效反射率并估算误差，应用于单光子出射动力学表征。
Quantum noise in the position measurement of a cavity mirror undergoing Brownian motion
本文对带自由移动后镜的相干驱动光腔输出光的相位测量噪声功率谱进行了量子理论计算。我们研究如何从量子反作用产生的噪声中出现的各种贡献，从其他噪声源。我们不假设一个理想的（零差）相位测量，而是考虑相位调制检测，我们表明有一个不同的散粒噪声水平。我们还考虑了反射镜的热阻尼，腔内损耗和经典激光噪声的影响。我们将我们的理论结果与实验参数相关联，以便与当前的实验简单地进行直接比较。我们还表明，在这种情况下，标准的布朗运动主方程是不足以描述的镜子的热阻尼，因为它产生一个虚假的长期在稳态相位波动谱。修正的布朗运动主方程[L. Diosi，Europhys. Lett. { \bf 22}，1（1993）]纠正了这一不足。
We present a general framework for cavity quantum electrodynamics with strongly frequency-dependent mirrors. The method is applicable to a variety of reflectors exhibiting sharp internal resonances as can be realized, for example, with photonic-crystal mirrors or with two-dimensional atomic arrays around subradiant points. Our approach is based on a modification of the standard input--output formalism to explicitly include the dynamics of the mirror's internal resonance. We show how to directly extract the interaction tuning parameters from the comparison with classical transfer matrix theory …
Photon correlation vs interference of single-atom fluorescence in a half-cavity
本文研究了激光激发的单离子在镜前的光子关联。通过改变离子与反射镜之间的相对距离，光子相关统计可以从反聚束最小值平滑地调谐到类聚束最大值。我们的分析关注的离子镜相互作用的非马尔可夫制度，并揭示了在半腔干涉仪场的建立。
Non-Markovian spontaneous emission in a tunable cavity formed by atomic mirrors
研究了由原子镜构成的可调谐腔中非马尔可夫自发辐射的动力学，展示了单模到多模强耦合的转变及非马尔可夫动力学的近似方法。
A promising approach to merge atomic systems with scalable photonics has emerged recently, which consists of trapping cold atoms near tapered nanofibers. Here, we describe a novel technique to achieve strong, coherent coupling between a single atom and photon in such a system. Our approach makes use of collective enhancement effects, which allow a lattice of atoms to form a high-finesse cavity within the fiber. We show that a specially designated "impurity" atom within the cavity can experience strongly enhanced interactions with single photons in the fiber. Under realistic conditions, a "stro…
We investigate an optomechanical system in which a cavity with a moving mirror is driven by two external fields. When the field frequencies match resonance conditions, we show that there exists a class of dark states of the moving mirror in the single-photon strong-coupling regime. These dark states, which cause the cavity to be decoupled from the external fields, is a manifestation of quantum coherence associated with the mirror's mechanical degrees of freedom. We discuss the properties of the dark states and indicate how they can be generated by optical pumping due to the decay of cavity fie…
A cavity optomechanical system is initiated by a radiation pressure of a cavity field onto a mirror element acting as a quantum resonator. This radiation pressure can control the thermodynamic character of the mirror to some extent, such as cooling its effective temperature. Here we show that by properly engineering the spectral density of a thermal heat bath that interacts with a quantum system, the evolution of the quantum system can be effectively turned on and off. Inside a cavity optomechanical system, when the heat bath is realized by a multi-mode oscillator modeling of the mirror, this …
We theoretically investigate the dispersive interaction of a Bose-Einstein condensate (BEC) trapped inside an optomechanical cavity with a moving end mirror in the presence of the laser phase noise (LPN) as well as the atomic collisions. We assume that the effective frequency of the optical mode is much greater than those of the mechanical and the Bogoliubov modes of the movable mirror and the BEC . In the adiabatic approximation where the damping rate of the cavity is faster than those of the other modes, the system behaves as an effective two-mode model in which the atomic and mechanical mod…
Cavity Optomechanical system is speedily approaching the regime where the radiation pressure of a single photon displaces the moving mirror. In this paper, we consider a cavity optomechanical system where the cavity field is driven by an external field. In the limit of weak mirror-cavity couplings, we calculate analytically the reflection and transmission rates for cavity field and discuss the effects of mirror-cavity coupling on the reflection and transmission.
We investigate the effects of atomic collisions as well as optomechanical mirror-field coupling on the optical bistability in a hybrid system consisting of a Bose-Einstein condensate inside a driven optical cavity with a moving end mirror. It is shown that the bistability of the system can be controlled by the s-wave scattering frequency which can provide the possibility of realizing a controllable optical switch. On the other hand, by studying the effect of the Bogoliubov mode, as a secondary mechanical mode relative to the mirror vibrations, on the cooling process as well as the bipartite mi…
Coherent feedback control for cavity optomechanical systems with a frequency-dependent mirror
针对 Fano 反射镜光机械装置通常处于深度边带不可分辨区的问题，本文提出采用适当的单边相干反馈，在宽参数范围、高光学损耗和低反馈效率下实现机械模式基态冷却，并指出标准双边反馈不适用。
Self-cooling of a movable mirror to the ground state using radiation pressure
我们证明了在一个适当失谐的腔中，利用辐射压力可以将微机械振荡器冷却到它的量子基态（自冷却）。从一个简单的理论基础上海森伯-朗之万方程，我们发现，最佳的自冷却发生在良好的腔制度，当腔的带宽小于机械频率，但仍然大于有效的机械阻尼。在这种情况下，腔内场和振动机械模式相干地交换它们的波动。我们还提出了动力学计算，显示如何访问镜的最终温度从腔反射场的波动。
Quantum state of a suspended mirror coupled to cavity light -- Wiener filter analysis of the pendulum and rotational modes
本研究利用维纳滤波分析耦合腔光的悬浮反射镜的摆模与旋转模双模理论，构建对应维纳滤波器预测量子态，证实多模分析对量子压缩态生成的重要性，并提出单模分析可通过选择傅里叶空间范围实现良好近似。
We study the effect of a strong coupling field on the absorptive property of a ring cavity with two mirrors oscillating at slightly different frequencies to a weak probe field. We observe double electromagnetically induced transparency windows separated by an absorption peak at line center in the output probe field under the action of a strong coupling field. We find that increasing driving power can broaden the two transparency windows, which results in narrowing of the central absorption peak. At high driving power, the linewidth of the sharp central absorption peak is approximately equal to…
We analyse the dynamics of a one-dimensional vertical Fabry-Pérot cavity, where the upper mirror levitates due to intra-cavity radiation pressure force. A perturbative approach is used based around separation of timescales, which allows us to calculate the physical quantities of interest. Due to the dynamics of the cavity field, we find that the upper mirror's motion will always be unstable for levitation performed using only a single laser. Stability can be achieved for two lasers, where one provides the trapping potential and the other a damping effect, and we locate and characterise all par…
We propose a simple method to generate quantum entanglement between two macroscopic mechanical resonators in a two-cavity optomechanical system. This entanglement is induced by the radiation pressure of a single photon hopping between the two cavities. Our results are analytical, so that the entangled states are explicitly shown. Up to local operations, these states are two-mode three-component states, and hence the degree of entanglement can be well quantified by the concurrence. By analyzing the system parameters, we find that, to achieve a maximum average entanglement, the system should wor…
We consider the motion of the end mirror of a cavity inside which a two-level atom trapped. The fast vibrating mirror induces nonlinear couplings between the cavity field and the atom. We analyze this optical effect by showing the population of the atom in its internal degrees of freedom as a function of time. On the other side, fast atom-field variables result in an additional potential for the atomic center-of-mass motion and the mirror vibration, leading to entanglement in the motion and the vibration. The entanglement has been numerically simulated and discussed.
Various lower- and higher-order nonclassical properties have been studied for two physical systems- (i) an optomechanical system composed of a Fabry-Perot cavity with one nonlinearly oscillating mirror and (ii) an optomechanical-like system formed using a Bose-Einstein condensate (BEC) trapped inside an optical cavity. The investigation is performed using a perturbation method that leads to closed form analytic expressions for the time evolution of the relevant bosonic operators. In the first system, it is observed that the radiation pressure coupling leads to the emergence of lower- and highe…
We study how an oscillating mirror affects the electromagnetically induced transparency (EIT) of an atomic ensemble, which is confined in a gas cell placed inside a micro-cavity with an oscillating mirror in one end. The oscillating mirror is modeled as a quantum mechanical harmonic oscillator. The cavity field acts as a probe light of the EIT system and also produces a light pressure on the oscillating mirror. The back-action from the mirror to the cavity field results in several (from one to five) steady-states for this atom-assisted optomechanical cavity, producing a complex structure in it…
Entangling the ro-vibrational modes of a macroscopic mirror using radiation pressure
本文研究了可维持拉盖尔-高斯模的光学法布里-珀罗腔的振动和旋转端镜的动力学。我们从理论上证明，由于腔内场进行线性以及角动量，辐射压力可以创建一个振动和旋转模式的镜子之间的二分纠缠。此外，我们表明，振动和旋转耦合与辐射场的比例可以很容易地通过实验进行调整，这使得纠缠的产生和检测对腔制造中的不确定性具有鲁棒性。这构成了第一个证明同一宏观物体的两个性质不同的自由度之间纠缠的提议。
A "microscopic" justification of the "symmetric damping" model of a quantum oscillator with time-dependent frequency and time-dependent damping is given. This model is used to predict results of experiments on simulating the dynamical Casimir effect in a cavity with a photo-excited semiconductor mirror. It is shown that the most general bilinear time-dependent coupling of a selected oscillator (field mode) to a bath of harmonic oscillators results in two equal friction coefficients for the both quadratures, provided all the coupling coefficients are proportional to a single arbitrary function …
The Fano effect arises from the interference between a continuum of propagating modes and a localised resonance. By using this resonance as one of the mirrors in an optical cavity, a localised mode with a highly asymmetric line shape is obtained. Placing a single quantum emitter inside the cavity leads to a new regime of cavity quantum electrodynamics, where the light-matter interaction dynamics is fundamentally different from that observed in a conventional cavity with Lorenztian lineshape. Furthermore, when the vibrational dynamics of the emitter is taken into account, an intricate phonon-ph…
We investigate a hybrid system consisting of an atomic ensemble trapped inside a dissipative optomechanical cavity assisted with the perturbative oscillator-qubit coupling. It is shown that such a hybrid system is very suitable for generating stationary squeezing of the mirror motion in the long-time limit under the unresolved sideband regime. Based on the approaches of master equation and covariance matrix, we discuss the respective squeezing effects in detail and find that in both approaches, simplifying the system dynamics with adiabatic elimination of the highly dissipative cavity mode is …
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