- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Wigner Function Reconstruction in Levitated Optomechanics
摘要： We demonstrate the reconstruction of the Wigner function from marginal distributions of the motion of a single trapped particle using homodyne detection. We show that it is possible to generate quantum states of levitated optomechanical systems even under the effect of continuous measurement by the trapping laser light. We describe the opto-mechanical coupling for the case of the particle trapped by a free-space focused laser beam, explicitly for the case without an optical cavity. We use the scheme to reconstruct the Wigner function of experimental data in perfect agreement with the expected Gaussian distribution of a thermal state of motion. This opens a route for quantum state preparation in levitated optomechanics.
关键词： Gaussian state,Wigner function,quantum state tomography,levitated optomechanics
更新于2025-09-09 09:28:46
-
Higher-order intermodal antibunching for couple-cavity optomechanical system
摘要： Higher-order intermodal antibunching for couple-cavity optomechanical system is investigated by solving Heisenberg’s equations of motion analytically for various field modes using short-time dynamics under strong coupling regime neglecting the effect of dissipation and environmental effects. Temporal variation of this nonclassical effect is also studied for different values of coupling strength and photon-hopping interaction term. The degree of nonclassicality increases as order grows.
关键词： Higher-order nonclassicality,Antibunching,Optomechanics
更新于2025-09-09 09:28:46
-
Scaling rules in optomechanical semiconductor micropillars
摘要： Semiconductor pillar microcavities have recently emerged as a promising optomechanical platform in the unprecedented 20-GHz frequency range. Currently established models for the mechanical behavior of micropillars, however, rely on complete numerical simulations or semianalytical approaches, which makes their application to experiments notoriously difficult. Here we overcome this challenge with an effective model by reducing the full, hybridized mechanical mode picture of a micropillar to an approach that captures the observed global trends. We show experimentally the validity of this approach by studying the lateral size dependence of the frequency, amplitude, and lifetime of the mechanical modes of square-section pillar microcavities, using room-temperature pump-probe microscopy. General scaling rules for these quantities are found and explained through simple phenomenological models of the physical phenomena involved. We show that the energy shift (Δωm) of the modes due to confinement is dependent on the inverse of their frequency ω0 and lateral size L (Δωm ∝ 1/ω0L2) and that the mode lifetime τ is linear with pillar size and inversely proportional to their frequency (τ ∝ L/ω0). The mode amplitude is in turn inversely proportional to the lateral size of the considered resonators. This is related to the dependence of the optomechanical coupling rate (g0 ∝ 1/L) with the spatial extent of the confined electromagnetic and mechanical fields. Using a numerical model based on the finite-element method, we determine the magnitude and size dependence of g0 and, by combining the results with the experimental data, we discuss the attainable single-photon cooperativity in these systems. The effective models proposed and the scaling rules found constitute an important tool in micropillar optomechanics and in the future development of more complex micropillar based devices.
关键词： scaling rules,semiconductor micropillars,optomechanics,mechanical modes,pump-probe microscopy
更新于2025-09-09 09:28:46
-
Optomechanically induced transparency under the influence of spin ensemble system
摘要： Optomechanics is a growing research field, which has received a great attention in the last decade both theoretically and experimentally. In this paper, we theoretically study the opto-mechanically induced transparency with spins coupled to the cavity field, while the cavity filed is driven by external strong coupling and weak probe fields. We analytically calculated the dynamics, as well as the transmissivity of the optomechanical system. The transmission is also examined and discussed. Moreover, the detailed behavior of the transmission shows well the optomechanical induced transparency (OMIT). The paper also show that the OMIT behaviors are strongly affected by the coupling between the spin ensemble and cavity field, as well as the spin decay rate.
关键词： Quantum optics,Optics,Quantum optomechanics
更新于2025-09-04 15:30:14
-
Two-timescale stochastic Langevin propagation for classical and quantum optomechanics
摘要： Interesting experimental signatures of quantum cavity optomechanics arise because the quantum back-action induces correlations between incident quantum shot noise and the cavity field. While the quantum linear theory of optomechanics (QLT) has provided vital understanding across many experimental platforms, in certain new setups it may be insufficient: analysis in the time domain may be needed, but QLT obtains only spectra in frequency space; and nonlinear behavior may be present. Direct solution of the stochastic equations of motion in time is an alternative, but unfortunately standard methods do not preserve the important optomechanical correlations. We introduce two-timescale stochastic Langevin (T2SL) propagation as an efficient and straightforward method to obtain time traces with the correct correlations. We show that T2SL, in contrast to standard stochastic simulations, can efficiently simulate correlation phenomena such as ponderomotive squeezing and reproduces accurately cavity sideband structures on the scale of the applied quantum noise and even complex features entirely submerged below the quantum shot noise imprecision floor. We investigate nonlinear regimes and find that, where comparison is possible, the method agrees with analytical results obtained with master equations at low temperatures and in perturbative regimes.
关键词： quantum back-action,nonlinear regimes,ponderomotive squeezing,quantum cavity optomechanics,stochastic Langevin propagation
更新于2025-09-04 15:30:14