In this paper, a random noise study is carried out, generated by an optical random number generator based on an InGaAs p-i-n photodiode. The influence of the procedure of equalization of the energy values of the of the continuous wavelet transform on the efficiency of passing the test for the FFT randomness from the set of NIST statistical tests.
A nanophotonic resonator with high Q-factor and low mode volume is a promising system for creating optoelectronic devices on a chip and enhancing the light-matter interaction. In this work, the parameters of a silicon nitride nanophotonic resonator have been optimized to generate high-quality resonant states. The calculations were carried out using a deterministic method of achieving high Q-factor values.
In this paper, we studied the properties of two-photon quantum states of light that emerge due to spontaneous parametric downconversion in a nonlinear waveguide with periodically poles structure. The spectral and entangled properties have been studied mainly for photon pairs whose spectra is located in the near-infrared range. We found that it is possible to select the geometric parameters of the structure of a lithium niobate nanowaveguide in such a way that the two-photon quantum state in the near-IR range will have a spectrum width of about 180THz.
The study of noise generated by a system homodyne detection of laser radiation was made when random noise is recorded at the outputs of anoptical beam splitter after differential detection of signals. We studied the dependence of noise parameters on the length of the signal sequence sample and the effect of detrending using wavelet analysis. The NIST test suite was used to evaluate the degree of randomness of the generated noise sequence.
In this work, we present a nano-optical scheme of quantum memory for surface plasmon-polariton (SPP) modes in a nanoscale planar waveguide with a resonant atomic ensemble characterized by the periodic structure of the inhomogeneously broadened line. The theoretical study of the SPP modes is presented, where the regime of slow propagation and low-losses was found for these modes with fixed transverse spatial confinement, which provides a strong nondissipative interaction with resonant atoms. We describe the basic physical properties of the studied scheme and demonstrate a perspective area for the implementation of fast nanoscale quantum memory and processing with surface SPP modes.
In this work, we present an integrated waveguide-resonator scheme of an atomic quantum transistor with a multi-qubit memory. The quantum transistor is realized in an atomic-photon molecule formed of a linear chain of three interconnected resonators, each of which contains one resonant three-level atom. The resonators are connected through the waveguides to the quantum memory containing long-lived multi-atomic ensembles capable of storage of photonic qubits with an arbitrary temporal mode. We consider the protocols for implementation of one- and two-qubit operations in the proposed scheme over a system of qubits stored in quantum memory. The advantages and experimental implementation of the proposed scheme are also discussed.
KEYWORDS: Near field, Optical microscopy, Near field optics, Microscopy, Waveguides, Spatial resolution, Near field scanning optical microscopy, Image resolution, Optical fibers, Metals
The advantages of the probe with the optimal form are illustrated using numerical calculations for TM1m modes. The conducted calculations show 10 times greater light throughput and the reception possibility of the more compactly localized light at the output probe aperture which could indicate better spatial resolution of the optical images in near-field optical technique using optimal probe.
Katzenellenbaum method of cross sections is developed to the calculation of the light field parameters in nearfield microscopy probe. The dynamics of the modes propagation in the narrowing probe is studied when the probe aperture size is less than the wavelength λ of light. The analytical expressions for the modes wave numbers in the taper probe have been obtained, which essentially facilitate the analysis of the field parameters in the probe and allow to save the computing time considerably. The influence of walls inclination corner of the probe on modes amplitudes behavior is determined for the excitation of the probe by the monochromatic light. We demonstrate that the variation of the wall inclination corner can result to essential changing of the spatial field structure in the output probe aperture. Using the cross sections method we have studied the propagation and decreasing of the femtosecond pulse of light with 50 fs pulse duration in the taper probe.
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