Research progress in non-classical microwave states preparation based on cavity optomechanical system

Luo, Jianqiao; Wu, Dewei; Miao, Qiang; Wei, Tianli

doi:10.7498/aps.69.20191735

Cited by 3 publications

(2 citation statements)

References 94 publications

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“…However, fluctuations in the conjugate quadrature are increased [ 17 , 18 ]. In comparison to the commonly used nonlinear optical media, optomechanical squeezing has a number of advantages: independent of the optical wavelength in the range from microwaves to optical fields [ 19 , 20 ], an adjustable frequency dependence of the squeezing quadrature using optical spring effects [ 21 , 22 ], and great capacity to be miniaturized in the long term [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback

Wang

Zhen

et al. 2022

Entropy

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A coherent feedback scheme is used to enhance the degree of squeezing of the output field in a cavity optomechanical system. In the feedback loop, a beam splitter (BS) plays the roles of both a feedback controller and an input–output port. To realize effective enhancement, the output quadrature should take the same form as the input quadrature, and the system should operate at the deamplification situation in the meantime. This can be realized by choosing an appropriate frequency-dependent phase angle for the generalized quadrature. Additionally, both the transmissivity of the BS and the phase factor induced by time delays in the loop affect optical squeezing. For the fixed frequency, the optimal values of transmissivity and phase factor can be used to achieve the enhanced optical squeezing. The effect of optical losses on squeezing is also discussed. Optical squeezing is degraded by the introduced vacuum noise owing to the inefficient transmission in the loop. We show that the enhancement of squeezing is achievable with the parameters of the current experiments.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback

Wang

Zhen

et al. 2022

Entropy

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“…Alternative to the OPO, the optomechanical (OM) interaction also gives rise to an effective nonlinearity for light field, and induces correlations between the amplitude and phase quadratures of light, leading to the generation of squeezed light termed as ponderomotive squeezing [7][8][9][10][11]. Compared to nonlinear optical media, OM squeezing possesses some advantages: independent of the optical wavelength ranging from microwave to optical fields [12][13][14], a tunable frequency dependence of the squeezing quadrature via the optical spring [15,16], and great potential to be miniaturized in the long term [17]. * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Squeezed light generation in cascaded optomechanical systems

Wang¹,

Zhen²,

Yan³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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We theoretically investigate the enhancement of the degree and bandwidth of squeezed states of light generated in cascaded optomechanical (OM) systems. With the obtained recursion relation of the generalized output quadratures, it is possible to realize cascaded OM systems operated simultaneously in a deamplification situation for the same quadrature with a frequency-dependent phase shift between cascaded systems. Due to the cumulative OM interaction, the degree of squeezing can be significantly improved and nearly independent of frequencies. Thus the squeezing frequency band is notably broadened. Moreover, the squeezing bandwidth can be further broadened through tuning the detunings between laser and cavity frequencies. Finally, the influence of optical losses on squeezing due to the inefficient transmission between cascaded systems is also taken into account, which degrades the squeezing via introducing uncorrelated vacuum noises. However, a better squeezed state is still achievable compared to that generated in single OM system.

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Novel one-dimensional optomechanical crystal nanobeam with high optomechanical coupling rate under different defect states

Xu,

Sun,

Song

et al. 2021

Acta Phys. Sin.

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Optomechanical crystals can simultaneously modulate elastic waves and electromagnetic waves as well as localizing phonons and photons to enhance the acousto-optic interaction. In this work, a new type of optomechanical crystal nanobeam cavity is designed by periodically arranging the unit cells with double holes on both sides of a hexagonal prism. Considering the moving boundary effect and the photoelastic effect as well as using the first-order electromagnetic perturbation theory and the optomechanical coupling coefficient calculation method, the optomechanical coupling rate of the structure is calculated. The result shows that the overlap between the optical mode and the mechanical mode can be improved by changing the number of defects and optimizing the geometric structure. For the nanobeam cavity structures with different numbers of the like defects, the number of defects will only affect the action mode of the moving boundary effect and photoelastic effect in the optomechanical coupling rate, but will not change the coupling rate too much. In particular, the optomechanical coupling rate of the single defect optomechanical crystal nanobeam cavity can reach –1.29 MHz, and the equivalent mass is 42.6 fg. Moreover, the designed structure is simple and easy to process and fabricate. The coupling rate of even-symmetric optomechanical crystal nanobeam cavity based on gradient defect can reach 2.25 MHz, and the coupling rate of odd symmetric structure can reach 2.18 MHz, in which the moving boundary effect is dominant. Based on the symmetry analysis of the vibration modes of the optomechanical crystal nanobeam cavity with gradient defects, it is worth noting that only the even symmetrical vibration modes of x-y, x-z and y-z can strongly couple with the optical modes. The surface density of the moving boundary effect is calculated and analyzed, and it is found that the surface density of the acoustic resonance mode with high symmetry also possesses high symmetry. However, when the surface density of the moving boundary effect in the defect state appears adjacent to each other and cancels out each other, it will destroy the coupling mode of the moving boundary effect and reduce the coupling rate, whether the symmetry is high or low. In addition, the designed optomechanical crystal nanobeam can also improve the quality factor of the resonant cavity by optimizing the defect structure while maintaining a high optomechanical coupling rate. Therefore, this research provides an effective means to find a structure with high optomechanical coupling rate, and also presents the ideas for designing the space sensors.

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Research progress in non-classical microwave states preparation based on cavity optomechanical system

Cited by 3 publications

References 94 publications

Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback

Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback

Squeezed light generation in cascaded optomechanical systems

Novel one-dimensional optomechanical crystal nanobeam with high optomechanical coupling rate under different defect states

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