Response of a mechanical oscillator in an optomechanical cavity driven by a finite-bandwidth squeezed vacuum excitation

Abstract

In this paper, we theoretically investigate the displacement and momentum fluctuations spectra of the movable mirror in a standard optomechanical system driven by a finite-bandwidth squeezed vacuum light accompanying a coherent laser field. Two cases in which the squeezed vacuum is generated by degenerated and non-degenerate parametric oscillators (DPO and NDPO) are considered. We find that for the case of finite-bandwidth squeezed vacuum injection, the two spectra exhibit unique features, which strongly differ from those of broadband squeezing excitation. In particular, the spectra exhibit a three-peaked and a four-peaked structure, respectively, for the squeezing injection from DPO and NDPO. Besides, some anomalous characteristics of the spectra such as squeezing-induced pimple, hole burning, and dispersive profile are found to be highly sensitive to the squeezing parameters and the temperature of the mirror. We also evaluate the mean-square fluctuations in position and momentum quadratures of the movable mirror and analyze the influence of the squeezing parameters of the input field on the mechanical squeezing. It will be shown that the parameters of driven squeezed vacuum affects the squeezing. We find the optimal mechanical squeezing is achievable via finite-bandwidth squeezed vacuum injection which is affected by the intensity of squeezed vacuum. We also show that the phase of incident squeezed vacuum determines whether position or momentum squeezing occurs. Our proposed scheme not only provides a feasible experimental method to detect and characterize squeezed light by optomechanical systems, but also suggests a way for controllable transfer of squeezing from an optical field to a mechanical oscillator.

Wigner Entropy Production Rate

“…Squeezed bath -We now generalize the above results to the case of a bosonic mode subject to a non-equilibrium broadband squeezed bath. This type of reservoir appears frequently in quantum optics [14,[33][34][35][36][37], whenever the squeeze radiation field is treated as an external bath. The bath is characterized by a temperature T (usually zero), a squeeze parameters re iθ and a central frequency ω s , related to the production of the squeezed field (usually by parametric down conversion).…”

Ultra-precision quantum sensing and measurement based on nonlinear hybrid optomechanical systems containing ultracold atoms or atomic Bose-Einstein condensate

“…Also, it has been recently theoretically shown that even the intracavity squeezing generated by parametric down conversion can enhance quantum-limited optomechanical position detection through de-amplification 219 . More recently, by investigating the response of the MO in an optomechanical cavity driven by a squeezed vacuum it has been shown that the system can be used as a high sensitive nonclassical light sensor 220 . In this section, we show that in the presence of CQNC if the cavity mode is injected with squeezed light with an appropriate phase, BA noise cancellation provided by CQNC is much more effective because squeezing allows to suppress the SN contribution at a much smaller input power, and one has a significant reduction of the force noise spectrum even with moderate values of squeezing and input laser power.…”

Quantum diagnosis of cancer with heralded single photons

“…highly sensitive measurements of physical parameters using a non-classical state of light [2][3][4][5]. The overcoming limitations for sensing hold relevance to biophysical and medical applications where sensitivity and resolution have a central role in the diagnosis [1].…”