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- 摘要
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Superradiance and Collective Gain in the Atom-Assisted Multimode Optomechanical System
摘要： We investigate that the muti-mode optomechanical system coupled with the two-level atoms. If the driving pump field is resonance with the anti-Stokes sideband, the system is at the superradiative state. For the driving filed in the Stokes sideband, the collective gain can be observed. We study a scheme that how the atomic medium affect these superradiance and collective gain. Our results show that the presence of the atom can enhance the superradiant behavior. In the mode splitting regime, the mode splits into thirds with the presence of the atoms with the anti-Stokes sideband. In addition, we also show that the use of atoms in this system could provide us a way to switch the system form superradiative state to collective gain.
关键词： Anti-stoke sideband,Stokes sideband,Atoms,Collective gain,Superradiance,Optomechanical system
更新于2025-09-23 15:23:52
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Electromagnetic engineered mechanical trapping potential and the conversion in optomechanics
摘要： The manipulation of mechanical response in optomechanical system allows observation of quantum behavior by cooling a mechanical resonance to its quantum mechanical ground state, and it relies on the effective tuning of trapping potentials. In this work, we investigate the conversion process between radiation pressure and mechanical trapping potential which is engineered by the optical field in an optomechanical system. Moreover, a set of trapping potentials could be achieved by tuning the system, such as detuning, pumping power and decay rates. Specifically, the speed of conversion between different potential states is studied which approaches the megahertz level.
关键词： optomechanical system,conversion,Mechanical trapping potential
更新于2025-09-23 15:21:21
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Interference effect in optomechanical stochastic resonance
摘要： In this paper, we study the stochastic resonance (SR) effect in an optomechanical system driven by a strong coupling field and two weak signals in both semiclassical and quantum frameworks. In the semiclassical description, the SR phenomena are found at the cooperation of input signals and system noises. When two signals coact on our system, the interference effect between the optically induced SR and the mechanically induced SR can be generated. In particular, a unique beating effect, which makes the SR effect robust against the initial phase difference of two signals, appears in the SR synchronization process with unsynchronized signals. In addition, the quantum stochastic resonance effect is numerically observed in the full quantum framework induced by pure quantum fluctuations.
关键词： beating effect,quantum framework,semiclassical framework,interference effect,stochastic resonance,optomechanical system
更新于2025-09-23 15:21:01
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Entanglement of microwave-optical modes in a strongly coupled electro-optomechanical system
摘要： Quantum transduction between microwaves and optics can be realized by quantum teleportation if given reliable microwave-optical entanglement, namely, entanglement-based quantum transduction. To realize this protocol, an entangled source with a high fidelity between the two frequencies is necessary. In this paper, we study microwave and optical entanglement generation based on a generic cavity electro-optomechanical system in the strong coupling regime. Splittings are shown in the microwave and optical output spectra and the frequency entanglement between the two modes is quantified. We show that entanglement can be straightforwardly encoded in the frequency-bin degree of freedom and propose a feasible experiment to verify entangled photon pairs. The experimental implementation is systematically analyzed, and the preferable parameter regime for entanglement verification is identified. An inequality is given as a criterion for good entanglement verification with analysis of practical imperfections.
关键词： strong coupling regime,electro-optomechanical system,quantum transduction,microwave-optical entanglement,frequency-bin entanglement
更新于2025-09-23 15:19:57
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Double-passage mechanical cooling in a coupled optomechanical system
摘要： We consider a three-mode optomechanical system where two cavity modes are coupled to a common mechanical oscillator. We focus on the resolved sideband limit and illustrate the relation between the significant parameters of the system and the instantaneous-state mean phonon number of the oscillator optical coupling set up a correlation between the two cavity modes, which has significant effect on the cooling process. Using numerical solutions, we find that the inter-cavity coupling will decrease the cooling effect when both cavities have the same effective optomechanical coupling. However, when the effective optomechanical couplings are different, the cooling effect will be strongly improved by selecting appropriate range of inter-cavity coupling.
关键词： Ground-state cooling,Optomechanical system,Quantum optics
更新于2025-09-19 17:13:59
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Fano resonance and amplification in a quadratically coupled optomechanical system with a Kerr medium
摘要： We discuss the Fano resonance and ampli?cation in a quadratically coupled optomechanical system with a nonlinear Kerr medium. We ?nd that effective cavity detuning and the strength of the Kerr nonlinearity lead to the appearance of the Fano resonance in the output probe ?eld at room temperature, respectively. We show that the Kerr nonlinearity causes the asymmetric line shape to appear in the intensities of the output Stokes ?eld and the second-order upper sideband generation. We also show that the Kerr nonlinearity can amplify the intensities of the output Stokes ?eld and the second-order upper sideband generation, and the ampli?cation factor is related to the strength of the Kerr nonlinearity. The ?ndings of this study have potential applications in optical switching and frequency conversion.
关键词： Fano resonance,quadratically coupled optomechanical system,amplification,Kerr medium
更新于2025-09-16 10:30:52
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Measuring weak magnetic field via dissipatively coupled opto-mechanical system
摘要： In this paper, we propose a scheme for the detection of weak magnetic field based on dissipatively coupled optomechanical system. The system considered here is composed of a perfect mirror and a compound mirror formed by a Michelson-Sagnac interferometer (MSI) with a movable membrane. When the transmissivity of MSI is close to zero, it sensitively depends upon the position of membrane. Under this condition, the two mirrors results in an effective Fabry-Perot interferometer (FPI) whose linewidth depends upon the position of the membrane. We show that by applying current to the membrane in the presence of magnetic field, the position of the membrane changes which in turn changes the linewidth of the effective FPI. This change can be observed in the spectrum of the output field and consequently enables us to measure weak magnetic field. Thus an optical detection technique is proposed for the detection of weak magnetic field.
关键词： Michelson-Sagnac interferometer,weak magnetic field,dissipatively coupled optomechanical system,optical detection technique,Fabry-Perot interferometer
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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Enhancing nanomechanical squeezing by atomic interactions in a hybrid atom-optomechanical system
摘要： In a hybrid atom-optomechanical system, the optical coupling of a mechanical mode of a nanomembrane in an optical cavity with a distant interacting atom gas permits highly nonclassical quantum many-body states. We show that the mechanical mode can be squeezed by the backaction of internal excitations of the atoms in the gas. A Bogoliubov approach reveals that these internal excitations form a fluctuating environment of quasiparticle excitations for the mechanical mode with a gaped spectral density. Nanomechanical squeezing arises due to quasiparticle excitations in the interacting atom gas when the mechanical frequency is close to resonance with the internal atomic transitions. Interestingly, nanomechanical squeezing is enhanced by atom-atom interactions.
关键词： Bogoliubov approach,atom-optomechanical system,quasiparticle excitations,nanomechanical squeezing,atom-atom interactions
更新于2025-09-09 09:28:46
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Superluminal effect in a hybrid nano-electro-optomechanical system
摘要： We theoretically investigate the phenomenon of superluminosity of the transmission probe field under the effect of a strong driving field in a hybrid nano-electro-optomechnical system comprising two coupled charged mechanical end resonators connected by bias voltages. The first mechanical charged mirror is connected to the optical field, while the second charged mirror is coupled by Coulomb coupling. We find that the superluminal behavior of the transmitted probe field can be switched by adjusting the cavity field detuning and atom field detuning. The present study extends the previously developed simple optomechanical and nano-electro-optomechanical system. Moreover, the group delay of the pulse advancement can be controlled by adjusting the electrostatic Coulomb coupling and the power of the driving field. We explain the effect of atomic field detuning on the superluminal behavior in the regimes of anti-Stokes sidebands, i.e., ?a=?ω1.
关键词： fast light,group delay,hybrid nano-electro-optomechanical system,Coulomb coupling,superluminal effect
更新于2025-09-09 09:28:46