scholarly journals Tunability of the Nonlinear Interferometer Method for Anchoring Constructive Interference Patterns on the ITU-T Grid

2021 ◽  
Vol 11 (4) ◽  
pp. 1429
Author(s):  
Kyungdeuk Park ◽  
Dongjin Lee ◽  
Heedeuk Shin
Keyword(s):  
Collection Efficiency ◽  
Single Mode ◽  
Fine Tuning ◽  
Interference Method ◽  
Constructive Interference ◽  
Information Process ◽  
Pair Generation ◽  
Transmission Window ◽  
Nonlinear Interferometer ◽  
Photon States

Recently, a method of engineering the quantum states with a nonlinear interferometer was proposed to achieve precise state engineering for near-ideal single-mode operation and near-unity efficiency (L. Cui et al., Phys. Rev. A 102, 033718 (2020)), and the high-purity bi-photon states can be created without degrading brightness and collection efficiency. Here, we study the coarse or fine tunability of the nonlinear interference method to match constructive interference patterns into a transmission window of standard 100-GHz DWDM channels. The joint spectral intensity spectrum is measured for various conditions of the nonlinear interference effects. We show that the method has coarse- and fine-tuning ability while maintaining its high spectral purity. We expect that our results expand the usefulness of the nonlinear interference method. The photon-pair generation engineered via this method will be an excellent practical source of the quantum information process.

Methods for fine-tuning the wavelength response of single-mode optical-fibre taper filters

1987 ◽  
Vol 23 (8) ◽  
pp. 410 ◽  
Author(s):  
A.C. Boucouvalas ◽  
G. Georgiou
Keyword(s):  
Optical Fibre ◽  
Single Mode ◽  
Fine Tuning

Fine-Tuning of the Spectral Collection Efficiency in a Multilayer Junction Through the LSP Technique

2005 ◽  
Vol 872 ◽  
Author(s):  
M. Fernandes ◽  
A. Fantoni ◽  
M. Niehus ◽  
P. Louro ◽  
G. Lavareda ◽  
...  
Keyword(s):  
Color Image ◽  
Collection Efficiency ◽  
Image Sensor ◽  
Fine Tuning ◽  
Blue Color ◽  
Device Structure ◽  
Image Mapping ◽  
Color Separation ◽  
Tandem Structure ◽  
And Inversion

AbstractWe report in this paper the recent advances we obtained in optimizing a color image sensor based on the LSP technique. A device structure based on a a-SiC:H/ a-Si:H pin/pin tandem structure has been tested for a proper color separation process that takes advantage on the different filtering properties due to the different light penetration depth at different wavelengths inside the a-Si:H and a-SiC:H absorbers. Under reverse bias the green and the red images give, in comparison with previous tested structures, a weak response, while this structure shows a very good recognition of blue color, leaving a good margin for future device optimization in order to achieve a complete and satisfactory RGB image mapping. The physics behind the device functioning is explained by recurring to a numerical simulation of the internal electrical configuration of the device in dark and under different wavelength irradiations. Considerations about conduction band offsets, electrical field profiles and inversion layers will be taken into account to explain the optical and voltage bias dependence of collected photocurrent.

Single mode collection efficiency enhancement for free space systems using photonic lantern

2013 ◽  
Author(s):  
Ibrahim Ozdur ◽  
Paul Toliver ◽  
Anjali Agarwal ◽  
T. K. Woodward
Keyword(s):  
Free Space ◽  
Collection Efficiency ◽  
Single Mode ◽  
Space Systems ◽  
Efficiency Enhancement

Single-Mode Generation of Quantum Photon States by Excited Single Molecules in a Microcavity Trap

1996 ◽  
Vol 76 (6) ◽  
pp. 900-903 ◽  
Author(s):  
F. De Martini ◽  
G. Di Giuseppe ◽  
M. Marrocco
Keyword(s):  
Single Molecules ◽  
Single Mode ◽  
Photon States ◽  
Mode Generation

scholarly journals Improved Superconducting Qubit State Readout by Path Interference

2021 ◽  
Vol 38 (11) ◽  
pp. 110303
Author(s):  
Zhiling Wang ◽  
Zenghui Bao ◽  
Yukai Wu ◽  
Yan Li ◽  
Cheng Ma ◽  
...  
Keyword(s):  
Quantum Information Processing ◽  
Quantum Circuit ◽  
Qubit State ◽  
Microwave Cavity ◽  
Single Shot ◽  
Superconducting Qubit ◽  
Constructive Interference ◽  
State Discrimination ◽  
Convenient Approach ◽  
Photon States

High fidelity single shot qubit state readout is essential for many quantum information processing protocols. In superconducting quantum circuit, the qubit state is usually determined by detecting the dispersive frequency shift of a microwave cavity from either transmission or reflection. We demonstrate the use of constructive interference between the transmitted and reflected signal to optimize the qubit state readout, with which we find a better resolved state discrimination and an improved qubit readout fidelity. As a simple and convenient approach, our scheme can be combined with other qubit readout methods based on the discrimination of cavity photon states to further improve the qubit state readout.

scholarly journals Quantum-Dot-Based Photon Emission and Media Conversion for Quantum Information Applications

2010 ◽  
Vol 2010 ◽  
pp. 1-13 ◽  
Author(s):  
H. Kumano ◽  
H. Nakajima ◽  
S. Ekuni ◽  
Y. Idutsu ◽  
H. Sasakura ◽  
...  
Keyword(s):  
Quantum Information ◽  
Quantum Dot ◽  
Electron Spin ◽  
Single Photon ◽  
Collection Efficiency ◽  
Photon Emission ◽  
Exciton State ◽  
Photon Pair ◽  
Photon Polarization ◽  
Pair Generation

Single-photon as well as polarization-correlated photon pair emission from a single semiconductor quantum dots is demonstrated. Single photon generation and single photon-pair generation with little uncorrelated multiphoton emission and the feasibility of media conversion of the quantum states between photon polarization and electron spin are fundamental functions for quantum information applications. Mutual media conversion for the angular momentum between photon polarization and electron spin is also achieved with high fidelity via positively charged exciton state without external magnetic field. This is a clear indication that the coupling of photon polarizations and electron spins keeps secured during whole processes before photon emission. Possibility of a metal-embedded structure is demonstrated with the observation of drastic enhancement of excitation and/or collection efficiency of luminescence as well as clear antibunching of photons generated from a quantum dot.

scholarly journals Multiple Layers of Silicon-Silica (Si-SiO2) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler

2016 ◽  
Author(s):  
Md Asaduzzaman ◽  
Masuduzzaman Bakaul ◽  
Stan Skafidas ◽  
Md Rezwanul Haque Khandokar
Keyword(s):  
Coupling Efficiency ◽  
Single Mode ◽  
Guided Wave ◽  
Grating Coupler ◽  
Si Substrate ◽  
Constructive Interference ◽  
Reflected Waves ◽  
Waveguide Grating ◽  
Silicon Photonic ◽  
Difference Time

A single mode waveguide grating coupler based on multiple Si-SiO2 pairs onto Si substrate has been designed. Numerical analysis has been carried out to calculate optimum thickness of the layers of Si-SiO2 that ensures the constructive interference between reflected waves and actual guided wave for high coupling efficiency. Based on the results, an optimal design is developed and modeled by using a 2-D finite difference time domain (2-D FDTD) simulator that dictates a coupling efficiency of as much as 78% (-1.07 dB) at the wavelength of 1550 nm, and a 1-dB bandwidth of 77 nm. The numerical method will be useful to calculate the optimum thicknesses of the layers for any reflector based grating coupler of different materials.

Free-space to single-mode collection efficiency enhancement using photonic lanterns

2013 ◽  
Vol 38 (18) ◽  
pp. 3554 ◽  
Author(s):  
Ibrahim Ozdur ◽  
Paul Toliver ◽  
Anjali Agarwal ◽  
T. K. Woodward
Keyword(s):  
Free Space ◽  
Collection Efficiency ◽  
Single Mode ◽  
Efficiency Enhancement

Microwave Plasma Assisted CVD of Diamond on Titanium and Ti-6Al-4V

1996 ◽  
Vol 430 ◽  
Author(s):  
D. A. Tucker ◽  
M. T. McClure ◽  
Z. Fathi ◽  
Z. Sitar ◽  
B. Walden ◽  
...  
Keyword(s):  
Microwave Plasma ◽  
Pure Titanium ◽  
Chemical Vapor ◽  
Single Mode ◽  
Fine Tuning ◽  
Single Frequency ◽  
Variable Frequency ◽  
Diamond Deposition ◽  
Tuning Parameters ◽  
Plasma Distribution

AbstractThe ultimate goal of this research was to demonstrate a Microwave Plasma assisted Chemical Vapor Deposition (MPCVD) process to coat a Ti-6A1-4V bearing shaft. Preliminary experiments were performed in an ASTeX™ system on flat chemically pure titanium and Ti-6AI-4V coupons. Diamond deposition was also attempted on a Ti-6AI-4V wedge sample which contained a curved surface that simulated the bearing. Although uniform diamond deposition was attained on the flat samples, very poor uniformity was observed on the curved sample. This lack of uniformity was attributed to the difficulty in controlling the plasma-to-substrate distance in a single mode, single frequency reactor and it was believed that by varying the frequency and using a multimode cavity one could solve this problem. Thus, depositions on a titanium rod were performed in a variable frequency MPCVD reactor. It was determined visually that the variable frequency operation provided uniform plasma distribution along the length and circumference of the rod and resulted in a fairly uniform coating. However, scanning electron microscopy revealed that the morphology of the particles was poor and micro-Raman spectroscopy showed weak, broad peaks that were attributable to amorphous carbon. It is believed that by fine-tuning parameters, a uniform diamond film of good quality can be achieved along the entire rod.

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