Parametrically amplified radiation in a cavity with an oscillating wall

Tomography of an optomechanical oscillator via parametrically amplified position measurement

We propose a protocol for quantum state tomography of nonclassical states in optomechanical systems. Using a parametric drive, the procedure overcomes the challenges of weak optomechanical coupling, poor detection efficiency, and thermal noise to enable high efficiency homodyne measurement. Our analysis is based on the analytic description of the generalized measurement that is performed when optomechanical position measurement competes with thermal noise and a parametric drive. The proposed experimental procedure is numerically simulated in realistic parameter regimes, which allows us to show…

Quantum Superposition of Parametrically Amplified Multiphoton Pure States whitin a Decoherence-Free Schroedinger-Cat Structure

The new process of quantum-injection into an optical parametric amplifier operating in entangled configuration is adopted to amplify into a large dimensionality spin 1/2 Hilbert space the quantum entanglement and superposition properties of the photon-couples generated by parametric down-conversion. The structure of the Wigner function and of the field's correlation functions shows a decoherence-free, multiphoton Schroedinger-cat behaviour of the emitted field which is largely detectable against the squeezed-vacuum noise. Furthermore, owing to its entanglement character, the system is found to…

Quantum Illumination with a Parametrically Amplified Idler

Quantum illumination uses a quantum state of the electromagnetic field to detect the presence of a target against a bright background more sensitively than any classical state. Most often, the quantum state is a two-mode squeezed vacuum consisting of signal and idler modes with a non-zero phase-sensitive cross correlation, which serves as the signature for target detection, and a zero phase-insensitive cross correlation, which means the modes produce no fringes in second order interference. Here it is shown that applying phase-sensitive amplification to the idler modes of a two-mode squeezed v…

具有两个参变驱动机械模式的光机械系统中的负腔光子谱函数

Negative cavity photon spectral function in an optomechanical system with two parametrically-driven mechanical modes

提出一种含两个参变驱动机械模式的光机械方案，通过控制协同参数与调制参数实现等效于负吸收的负腔光子谱函数，为可调光机械滤波器与光学晶体管提供新平台。