1,686 research outputs found
Single-photon transport and mechanical NOON state generation in microcavity optomechanics
We investigate the single-photon transport in a single-mode optical fiber
coupled to an optomechanical system in the single-photon strong-coupling
regime. The single-photon transmission amplitude is analytically obtained with
a real-space approach and the effects of thermal noises are studied via
master-equation simulations. The results provide an explicit understanding of
optomechanical interaction and offer a useful guide for manipulating single
photons in optomechanical systems. Based on the theoretical framework, we
further propose a scheme to generate the mechanical NOON states with arbitrary
phonon numbers by measuring the sideband photons. The probability for
generating the NOON state with five phonons is over 0.15.Comment: 13 pages, 6 figure
Object Detection Based on Fast/Faster RCNN Employing Fully Convolutional Architectures
Modern object detectors always include two major parts: a feature extractor and a feature classifier as same as traditional object detectors. The deeper and wider convolutional architectures are adopted as the feature extractor at present. However, many notable object detection systems such as Fast/Faster RCNN only consider simple fully connected layers as the feature classifier. In this paper, we declare that it is beneficial for the detection performance to elaboratively design deep convolutional networks (ConvNets) of various depths for feature classification, especially using the fully convolutional architectures. In addition, this paper also demonstrates how to employ the fully convolutional architectures in the Fast/Faster RCNN. Experimental results show that a classifier based on convolutional layer is more effective for object detection than that based on fully connected layer and that the better detection performance can be achieved by employing deeper ConvNets as the feature classifier
Effective Photon-Photon Interactions in Largely Detuned Optomechanics
We propose to realize effective beam-splitter-like and two-mode-squeezing
photon-photon interactions in a strong coupling optomechanical interface by
exploiting detuned driving lasers. In this interface, the transitions between
the optical system and the mechanical oscillator are suppressed by the large
energy offsets, therefore protecting the photon-photon interactions from
mechanical dissipations. Moreover, the destructive quantum interference between
the eigenmodes of the interface is capable of further reducing the effects of
initial mechanical thermal occupations. The interface can serve as a universal
block for photon state engineering and hybrid quantum networks in
high-temperature thermal bath and without the requirement of cooling the
mechanical oscillator to the ground state.Comment: 12 pages, 4 figure
Dual-frequency liquid crystal gels with submillisecond response time
Two types of gels using dual-frequency liquid crystal are demonstrated. The one using a homogeneous cell shows anisotropic scattering behavior while the other prepared using a cell without polyimide alignment layers exhibits isotropic scattering properties. Both liquid crystal gels are highly transparent in the voltage-off state. Light scattering occurs when a high frequency voltage is applied. The isotropic gel exhibits a high contrast ratio and submillisecond response time. Potential applications of these gels for switchable polarizer, telecom optical switch, and reflective displays are emphasized
1-(4-Chlorophenyl)-1H-pyrazol-3-ol
In the title compound, C9H7ClN2O, the dihedral angle between the aromatic ring planes is 11.0 (2)°. In the crystal, inversion dimers linked by pairs of O—H⋯N hydrogen bonds generate R
2
2(8) loops
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