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Silicon Nitride MOMS Oscillator for Room Temperature Quantum Optomechanics
摘要： Optomechanical SiN nano-oscillators in high-finesse Fabry–Perot cavities can be used to investigate the interaction between mechanical and optical degree of freedom for ultra-sensitive metrology and fundamental quantum mechanical studies. In this paper, we present a nano-oscillator made of a high-stress round-shaped SiN membrane with an integrated on-chip 3-D acoustic shield properly designed to reduce mechanical losses. This oscillator works in the range of 200 kHz to 5 MHz and features a mechanical quality factor of Q ≈ 107 and a Q-frequency product in excess of 6.2 × 1012 Hz at room temperature, fulfilling the minimum requirement for quantum ground-state cooling of the oscillator in an optomechanical cavity. The device is obtained by MEMS deep reactive-ion etching (DRIE) bulk micromachining with a two-side silicon processing on a silicon-on-insulator wafer. The microfabrication process is quite flexible such that additional layers could be deposited over the SiN membrane before the DRIE steps, if required for a sensing application. Therefore, such oscillator is a promising candidate for quantum sensing applications in the context of the emerging field of quantum technologies.
关键词： reactive ion etching,MOMS oscillator,quantum optomechanics,SiN thin membrane
更新于2025-09-23 15:21:21
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Rapid mechanical squeezing with pulsed optomechanics
摘要： Macroscopic mechanical oscillators can be prepared in quantum states and coherently manipulated using the optomechanical interaction. This has recently been used to prepare squeezed mechanical states. However, the scheme used in these experiments relies on slow, dissipative evolution that destroys the system’s memory of its initial state. In this paper we propose a protocol based on a sequence of four pulsed optomechanical interactions. In addition to being coherent, our scheme executes in a time much shorter than a mechanical period. We analyse applications in impulsive force sensing and preservation of Schr?dinger cat states, which are useful in continuous-variable quantum information protocols.
关键词： mechanical squeezing,pulsed optomechanics,quantum optomechanics
更新于2025-09-10 09:29:36
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Higher-Order Interactions in Quantum Optomechanics: Analysis of Quadratic Terms
摘要： This article presents a full operator analytical method for studying the quadratic nonlinear interactions in quantum optomechanics. The method is based on the application of higher-order operators, using a six-dimensional basis of second order operators which constitute an exactly closed commutators. We consider both types of standard position-field and the recently predicted non-standard momentum-field quadratic interactions, which is significant when the ratio of mechanical frequency to optical frequency is not negligible. This unexplored regime of large mechanical frequency can be investigated in few platforms including the superconducting electromechanics and simulating quantum cavity electrodynamic circuits. It has been shown that the existence of non-standard quadratic interaction could be observable under appropriate conditions.
关键词： quantum cavity electrodynamic circuits,quantum optomechanics,higher-order operators,quadratic nonlinear interactions,superconducting electromechanics
更新于2025-09-09 09:28:46
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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