scholarly journals A high-brightness source of polarization-entangled photons optimized for applications in free space

2012 ◽  
Vol 20 (9) ◽  
pp. 9640 ◽  
Author(s):  
Fabian Steinlechner ◽  
Pavel Trojek ◽  
Marc Jofre ◽  
Henning Weier ◽  
Daniel Perez ◽  
...  
Keyword(s):  
Free Space ◽  
Entangled Photons ◽  
High Brightness

Entangled photons produced by a three-level atom in free-space

2008 ◽  
Vol 281 (9) ◽  
pp. 2695-2699 ◽  
Author(s):  
Yong Hong Ma ◽  
Qing Xia Mu ◽  
Ling Zhou
Keyword(s):  
Free Space ◽  
Entangled Photons ◽  
Level Atom

Free space distribution of entangled photons pairs in daylight conditions

2007 ◽  
Author(s):  
Antia Lamas-Linares ◽  
Ivan Marcikic ◽  
Caleb Ho ◽  
Matthew Peloso ◽  
Christian Kurtsiefer
Keyword(s):  
Free Space ◽  
Space Distribution ◽  
Entangled Photons

scholarly journals Free-space quantum key distribution with entangled photons

2006 ◽  
Vol 89 (10) ◽  
pp. 101122 ◽  
Author(s):  
Ivan Marcikic ◽  
Antía Lamas-Linares ◽  
Christian Kurtsiefer
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Entangled Photons

Satellite-Borne High-Brightness Source of Entangled Photons

2019 ◽  
Author(s):  
Yuan Cao ◽  
Yu-Huai Li ◽  
Guang-Bing Li ◽  
Sheng-Kai Liao ◽  
Ji-Gang Ren ◽  
...  
Keyword(s):  
Entangled Photons ◽  
High Brightness

scholarly journals Approaching the Tsirelson bound with a Sagnac source of polarization-entangled photons

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Sandra Meraner ◽  
Robert Chapman ◽  
Stefan Frick ◽  
Robert Keil ◽  
Maximilian Prilmüller ◽  
...  
Keyword(s):  
Focal Point ◽  
Collection Efficiency ◽  
Bell State ◽  
Entangled Photons ◽  
Bipartite Entanglement ◽  
High Brightness ◽  
Chsh Inequality ◽  
Down Conversion ◽  
Very High ◽  
Tsirelson Bound

High-fidelity polarization-entangled photons are a powerful resource for quantum communication, distributing entanglement and quantum teleportation. The Bell-CHSH inequality S\leq2S≤2 is violated by bipartite entanglement and only maximally entangled states can achieve S=2\sqrt{2}S=22, the Tsirelson bound. Spontaneous parametric down-conversion sources can produce entangled photons with correlations close to the Tsirelson bound. Sagnac configurations offer intrinsic stability, compact footprint and high collection efficiency, however, there is often a trade off between source brightness and entanglement visibility. Here, we present a Sagnac polarization-entangled source with 2\sqrt{2}-S=(5.65\pm0.57\times10^{-3})22−S=(5.65±0.57×10−3), on-par with the highest SS parameters recorded, while generating and detecting (4660\pm70)pairs/s/mW(4660±70)pairs/s/mW, which is a substantially higher brightness than previously reported for Sagnac sources and around two orders of magnitude brighter than for traditional cone sources with the highest SS parameters. Our source records 0.9953\pm0.00030.9953±0.0003 concurrence and 0.99743\pm0.000140.99743±0.00014 fidelity to an ideal Bell state. By studying systematic errors in Sagnac sources, we identify that the precision of the collection focal point inside the crystal plays the largest role in reducing the SS parameter in our experiment. We provide a pathway that could enable the highest SS parameter recorded with a Sagnac source to-date while maintaining very high brightness.

A Stable Field Emission Electron Source

1977 ◽  
Vol 35 ◽  
pp. 58-59
Author(s):  
W.R. Bottoms ◽  
G.B. Haydon
Keyword(s):  
Field Emission ◽  
Signal To Noise Ratio ◽  
High Brightness ◽  
Electron Sources ◽  
Brightness Field ◽  
Current Densities ◽  
Properties Of Materials ◽  
Stable Field ◽  
Stable Current ◽  
Careful Design

There is great interest in improving the brightness of electron sources and therefore the ability of electron optical instrumentation to probe the properties of materials. Extensive work by Dr. Crew and others has provided extremely high brightness sources for certain kinds of analytical problems but which pose serious difficulties in other problems. These sources cannot survive in conventional system vacuums. If one wishes to gather information from the other signal channels activated by electron beam bombardment it is necessary to provide sufficient current to allow an acceptable signal-to-noise ratio. It is possible through careful design to provide a high brightness field emission source which has the capability of providing high currents as well as high current densities to a specimen. In this paper we describe an electrode to provide long-lived stable current in field emission sources.The source geometry was based upon the results of extensive computer modeling. The design attempted to maximize the total current available at a specimen.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

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