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arXiv:2503.16130

Effects of driven atomic ensemble on the output spectrum and entanglement of optomechanical system

Burabigul Yakup, Yi-Fang Ren, Mamat Ali Bake, Yusuf Turek

Published Mar 20, 2025• 0 citations
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Abstract

This paper considers an indirect driving model of a cavity QED system in which the left cavity wall consists of a large ensemble of two-level atoms driven by a classical laser field at a specific resonant frequency, inducing an effective drive for the optomechanical system. We investigate the effects of the atomic ensemble on the output intensity squeezing spectrum and the entanglement between the optical and mechanical modes. Our results show that both the coupling between the atomic ensemble and the cavity mode and the excitation level of the atomic ensemble significantly influences the output spectrum and the entanglement. The theoretical model presented in this paper provides deeper insight into the mechanisms governing correlations and squeezing spectra in conventional optomechanical systems.

DOI
10.48550/arxiv.2503.16130

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This paper considers an indirect driving model of a cavity QED system in which the left cavity wall consists of a large ensemble of two-level atoms driven by a classical laser field at a specific resonant frequency, inducing an effective drive for the optomechanical system. We investigate the effects of the atomic ensemble on the output intensity squeezing spectrum and the entanglement between the optical and mechanical modes. Our results show that both the coupling between the atomic ensemble and the cavity mode and the excitation level of the atomic ensemble significantly influences the output spectrum and the entanglement. The theoretical model presented in this paper provides deeper insight into the mechanisms governing correlations and squeezing spectra in conventional optomechanical systems.
Abstract This paper considers an indirect driving model of a cavity QED system in which the left cavity wall consists of a large ensemble of two-level atoms driven by a classical laser field at a specific resonant frequency, inducing an effective driving for the optomechanical system. We investigate the effects of the atomic ensemble on the output intensity squeezing spectrum and the entanglement between the optical and mechanical modes. Our results show that both the coupling between the atomic ensemble and the cavity mode and the excitation level of the atomic ensemble significantly influence the output spectrum and the entanglement. The theoretical model presented in this paper may provide deeper insight into the mechanisms governing correlations and squeezing spectra in conventional optomechanical systems.
Abstract We study the pump-probe response in an optomechanical cavity accommodating an ensemble of two-level atoms interacting with a cavity mode, which is pumped by a strong driving field and probed by a weak signal field. The atomic excitation is examined without taking any approximations and may be in any regimes ranging from the low limit to the high limit for a given collective coupling constant between the atomic ensemble and the cavity mode. This then results in different absorption and dispersion spectra (such as optomechanically induced transparency, Fano-resonance, normal-mode splitting) when the excitation transfer from cavity mode to atomic ensemble is controlled to change from ineffective to effective. This indicates that a hybrid optomechanical response is indeed determined by the excitation of the atomic ensemble embedded in the optomechanical cavity. It is also of interest that the output signal component and the inside atomic polarization show either synchronous or asynchronous behaviors depending on how the atom-field detuning is chosen, i.e. equal to the mechanical resonator frequency or its negative. Such features may open up an effective avenue in coherently manipulating the internal atomic polarization via the external signal field, and vice versa.
Abstract A scheme is addressed to generate the macroscopic entanglement and the output squeezing of optomechanical system with a single four-level atom. Applying the logarithmic negativity to measure entanglement, we analyze the effect of the coupling strength between the cavity and the atom on the entanglement of the cavity and the movable mirror. It is found that the robustness of the entanglement is enhanced with increasing of atom-cavity coupling, and the entanglement has a valley around when Δ is equal to ω m . Furthermore, we also analyze the output entanglement. The results show that the frequency of the mirror oscillation and the Rabi frequency of laser field affect the output squeezing spectrum.
A cavity QED system is analysed which duplicates the dynamics of a two-level atom in free space interacting exclusively with broadband squeezed light. We consider atoms in a three-or four-level Λ configuration coupled to a high-finesse optical cavity which is driven by a squeezed light field. Raman transitions are induced between a pair of stable atomic ground states via the squeezed cavity mode and coherent driving fields. An analysis of the reduced master equation for the atomic ground states shows that a three-level atomic system has insufficient parameter flexibility to act as an effective two-level atom interacting exclusively with a squeezed reservoir. However, the inclusion of a fourth atomic level, coupled dispersively to one of the two ground states by an auxiliary laser field, introduces an extra degree of freedom and enables the desired interaction to be realized. As a means of detecting the reduced quadrature decay rate of the effective two-level system, we examine the transmission spectrum of a weak coherent probe field incident upon the cavity. The extension to multiple atoms is also considered and we show that such a cavity QED system may also duplicate the dynamics of an ensemble of two-level atoms collectively coupled to broadband squeezed light.
We investigate theoretically an optomechanical system composed of an optical mode and a mechanical mode interacting through first-order coupling and second-order coupling in the presence of a Kerr nonlinear medium. We study how the nonlinearities (second-order optomechanical coupling and Kerr nonlinearity) alter the optical output spectrum, optical quadrature squeezing and optomechanical entanglement. It is shown that the intensity of the output optical spectrum decreases drastically with an increase in second-order optomechanical coupling while it increases significantly with an increase in Kerr nonlinear parameter. More interestingly, by choosing suitable second-order optomechanical coupling and detuning of the optical cavity field, one can achieve strong squeezing of the cavity light field. Further, these nonlinearities play an important role in creating robust optomechanical entanglement between optical and mechanical modes. Hence, the presence of various nonlinearities in the system can be a good platform for achieving the squeezing of light and robust optomechanical entanglement which can be used in realizing better quantum optomechanical devices.
We investigate the entanglement and mechanical squeezing of a hybrid system formed by two two-level atomic ensembles and a dissipative optomechanical system driven by two lasers. We find the entanglement of two atomic ensembles can be adjusted by the dissipative and dispersive couplings of the system. If the dispersive coupling is taken into account, the maximal entanglement between atomic ensembles could be larger than that of the purely dissipative case. Then, we show that there is steady-state entanglement in the present dissipative optomechanics systems and it increases with the mechanical oscillator decay rate and driving laser power. Finally, a strong mechanical squeezing of more than 3[Formula: see text]dB is generated in the dissipative atom-photomechanical hybrid systems.