scholarly journals Theory of Quantum Path Entanglement and Interference with Multiplane Diffraction of Classical Light Sources

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 246 ◽  
Author(s):  
Burhan Gulbahar
Keyword(s):  
Operator Theory ◽  
Photon Counting ◽  
Temporal Correlation ◽  
Low Complexity ◽  
Integral Approach ◽  
Light Sources ◽  
Consistent Histories ◽  
Coherent Light ◽  
Definition Of ◽  
Feynman Paths

Quantum history states were recently formulated by extending the consistent histories approach of Griffiths to the entangled superposition of evolution paths and were then experimented with Greenberger–Horne–Zeilinger states. Tensor product structure of history-dependent correlations was also recently exploited as a quantum computing resource in simple linear optical setups performing multiplane diffraction (MPD) of fermionic and bosonic particles with remarkable promises. This significantly motivates the definition of quantum histories of MPD as entanglement resources with the inherent capability of generating an exponentially increasing number of Feynman paths through diffraction planes in a scalable manner and experimental low complexity combining the utilization of coherent light sources and photon-counting detection. In this article, quantum temporal correlation and interference among MPD paths are denoted with quantum path entanglement (QPE) and interference (QPI), respectively, as novel quantum resources. Operator theory modeling of QPE and counterintuitive properties of QPI are presented by combining history-based formulations with Feynman’s path integral approach. Leggett–Garg inequality as temporal analog of Bell’s inequality is violated for MPD with all signaling constraints in the ambiguous form recently formulated by Emary. The proposed theory for MPD-based histories is highly promising for exploiting QPE and QPI as important resources for quantum computation and communications in future architectures.

The Influence Of The Led Luminaires Electrical Parameters On Their Correlated Colour Temperature During Operation Mode

2020 ◽  
pp. 89-96
Author(s):  
Sergei S. Kapitonov ◽  
Alexei S. Vinokurov ◽  
Sergei V. Prytkov ◽  
Sergei Yu. Grigorovich ◽  
Anastasia V. Kapitonova ◽  
...  
Keyword(s):  
Operation Mode ◽  
Light Sources ◽  
Electrical Parameters ◽  
Colour Temperature ◽  
Radiation Spectra ◽  
Service Period ◽  
Close Proximity ◽  
Definition Of ◽  
Comprehensive Study

The article describes the results of comprehensive study aiming at increase of quality of LED luminaires and definition of the nature of changes in their correlated colour temperature (CCT) in the course of operation. Dependences of CCT of LED luminaires with remote and close location of phosphor for 10 thousand hours of operation in different electric modes were obtained; the results of comparison between the initial and final radiation spectra of the luminaires are presented; using mathematical statistics methods, variation of luminaire CCT over the service period claimed by the manufacturer is forecast; the least favourable electric operation modes with the highest CCT variation observed are defined. The obtained results have confirmed availability of the problem of variation of CCT of LED luminaires during their operation. Possible way of its resolution is application of more qualitative and therefore expensive LEDs with close proximity of phosphor or LEDs with remote phosphor. The article may be interesting both for manufacturers and consumers of LED light sources and lighting devices using them.

Polariton Devices

2017 ◽  
Author(s):  
Alexey V. Kavokin ◽  
Jeremy J. Baumberg ◽  
Guillaume Malpuech ◽  
Fabrice P. Laussy
Keyword(s):  
Semiconductor Devices ◽  
Logic Gates ◽  
Light Sources ◽  
Coherent Light ◽  
Final State ◽  
Spintronic Devices ◽  
Exciton Polaritons ◽  
Terahertz Lasers ◽  
Coherence Lengths ◽  
Stimulation Of

Polariton devices offer multiple advantages compared to conventional semiconductor devices. The bosonic nature of exciton polaritons offers opportunity of realisation of polariton lasers: coherent light sources based on bosonic condensates of polaritons. The final state stimulation of any transition feeding a polariton condensate has been used in many proposals such as for terahertz lasers based on polariton lasers. Furthermore, large coherence lengths of exciton-polaritons in microcavities open the way to realisation of polariton transport devices including transistors and logic gates. Being bosonic spin carriers, exciton-polaritons may be used in spintronic devices and polarisation switches. This chapter offers an overview on the existing proposals for polariton devices.

Electrically driven single microribbon based near-infrared exciton-polariton light-emitting diode

CrystEngComm ◽  
2021 ◽  
Author(s):  
Mingming Jiang ◽  
Fupeng Zhang ◽  
Kai Tang ◽  
Peng Wan ◽  
Caixia Kan
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Light Sources ◽  
Coherent Light ◽  
Light Emitting ◽  
Exciton Polaritons ◽  
Laser Devices

Achieving electrically-driven exciton-polaritons has drawn substantial attention toward developing ultralow-threshold coherent light sources, containing polariton laser devices and high-performance light-emitting diodes (LEDs). In this work, we demonstrate an electrically driven...

Silicon nitride metasurfaces in structural colors and advanced coherent light sources

2021 ◽  
Author(s):  
Jhen-Hong Yang ◽  
Kuo-Ping Chen
Keyword(s):  
Silicon Nitride ◽  
Light Sources ◽  
Coherent Light ◽  
Structural Colors

Auto White Balance Algorithm in Digital Camera

2012 ◽  
Vol 182-183 ◽  
pp. 2080-2084
Author(s):  
Jie Li ◽  
Xue Xiang Wang ◽  
Hao Liu
Keyword(s):  
Hardware Implementation ◽  
Digital Camera ◽  
Low Complexity ◽  
Light Sources ◽  
Light Conditions ◽  
Threshold Method ◽  
White Balance ◽  
White Point ◽  
A New Technique ◽  
Better Than

Auto white balance (AWB) is an important function of digital camera. The purpose of white balance is to adjust the image to make it look like taken under standard light conditions. We present a new technique to detect the reference white point of image in this paper. This technique detects the white point of image by using dynamic threshold method, thus making it more flexible and more applicable compared to other algorithms. We test 50 images which were taken under different light sources, and find that this algorithm is better than or comparable to other algorithms both in subjective and objective aspects. At the same time, this algorithm has low complexity, and it can be easily applied to hardware implementation.

Surface plasmon polariton nanolasers: Coherent light sources for new applications

2018 ◽  
Vol 27 (11) ◽  
pp. 114208 ◽  
Author(s):  
Yu-Hsun Chou ◽  
Chia-Jui Chang ◽  
Tzy-Rong Lin ◽  
Tien-Chang Lu
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Light Sources ◽  
Coherent Light ◽  
Plasmon Polariton ◽  
New Applications

scholarly journals Photon counting statistics with imperfect detectors

2021 ◽  
Vol 2086 (1) ◽  
pp. 012096
Author(s):  
Aleksei Reutov ◽  
Denis Sych
Keyword(s):  
Continuous Wave ◽  
Single Photon ◽  
Functional Dependence ◽  
Photon Counting ◽  
Light Sources ◽  
Photon Detectors ◽  
Quantum Properties ◽  
Single Photon Detectors ◽  
The Mean ◽  
Counting Statistics

Abstract Measurement of photon statistics is an important tool for the verification of quantum properties of light. Due to the various imperfections of real single photon detectors, the observed statistics of photon counts deviates from the underlying statistics of photons. Here we analyze statistical properties of coherent states, and investigate a connection between Poissonian distribution of photons and sub-Poissonian distribution of photon counts due to the detector dead-time corrections. We derive a functional dependence between the mean number of photons and the mean number of photon counts, as well as connection between higher-order statistical moments, for the pulsed or continuous wave coherent light sources, and confirm the results by numerical simulations.

scholarly journals Extended depth of focus multiphoton microscopy via incoherent pulse splitting

2020 ◽  
Author(s):  
Bingying Chen ◽  
Tonmoy Chakraborty ◽  
Stephan Daetwyler ◽  
James D. Manton ◽  
Kevin Dean ◽  
...  
Keyword(s):  
Multiphoton Microscopy ◽  
Laser Pulses ◽  
Low Complexity ◽  
Phase Mask ◽  
Light Sources ◽  
Depth Of Focus ◽  
Ultrafast Laser Pulses ◽  
Two Photon Microscopy ◽  
Two Photon ◽  
Extended Depth Of Focus

AbstractWe present a phase mask that can be easily added to any multi-photon raster scanning microscope to extend the depth of focus five-fold at a small loss in lateral resolution. The method is designed for ultrafast laser pulses or other light-sources featuring a low coherence length. In contrast to other methods of focus extension, our approach uniquely combines low complexity, high light-throughput and multicolor capability. We characterize the point-spread function in a two-photon microscope and demonstrate fluorescence imaging of GFP labeled neurons in fixed brain samples as imaged with conventional and extended depth of focus two-photon microscopy.

scholarly journals Ecological analyses of the area along the highway through Belgrade: Section Dobanovci-Bubanj Potok

2006 ◽  
Vol 86 (1) ◽  
pp. 221-230
Author(s):  
Dejan Filipovic ◽  
Bogdan Lukic
Keyword(s):  
Environmental Impact ◽  
Integral Approach ◽  
Impact Study ◽  
Ecological Aspect ◽  
Protection Measures ◽  
Starting Point ◽  
Environmental Impact Study ◽  
Definition Of ◽  
The Impact

In compatibility with actual recommendations and policy which leads to improvement and preservation of integral environment and especially its natural values, it is necessary to implement active and integral approach to all variety of planning documents. In order to visualize the impact of highway through Belgrade on its surroundings, the solutions of the traffic artery were analyzed from the aspect of the protection of the environment in the sense of definition of harmful impacts and proposals of measures for their prevention or removal. The basic starting point was to get the answer whether and which, from ecological aspect, protection measures should be taken. The paper will show specific details of making the Belgrade highway environmental impact study.

scholarly journals Temporal Encoding to Reject Background Signals in a Low Complexity, Photon Counting Communication Link

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1671 ◽  
Author(s):  
Alexander Griffiths ◽  
Johannes Herrnsdorf ◽  
Christopher Lowe ◽  
Malcolm Macdonald ◽  
Robert Henderson ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Single Photon ◽  
Photon Counting ◽  
Low Complexity ◽  
Low Power Consumption ◽  
Communication Link ◽  
Free Space Optical ◽  
Received Power ◽  
Temporal Encoding

Communicating information at the few photon level typically requires some complexity in the transmitter or receiver in order to operate in the presence of noise. This in turn incurs expense in the necessary spatial volume and power consumption of the system. In this work, we present a self-synchronised free-space optical communications system based on simple, compact and low power consumption semiconductor devices. A temporal encoding method, implemented using a gallium nitride micro-LED source and a silicon single photon avalanche photo-detector (SPAD), demonstrates data transmission at rates up to 100 kb/s for 8.25 pW received power, corresponding to 27 photons per bit. Furthermore, the signals can be decoded in the presence of both constant and modulated background noise at levels significantly exceeding the signal power. The system’s low power consumption and modest electronics requirements are demonstrated by employing it as a communications channel between two nano-satellite simulator systems.

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