scholarly journals Single-photon entanglement concentration for long-distance quantum communication

2010 ◽  
Vol 10 (3&4) ◽  
pp. 272-281
Author(s):  
Y.-B. Sheng ◽  
F.-G. Deng ◽  
H.-Y. Zhou
Keyword(s):  
Quantum Communication ◽  
Single Photon ◽  
Entanglement Concentration ◽  
Entangled States ◽  
Accurate Information ◽  
Photon Detectors ◽  
Long Distance ◽  
Practical Applications ◽  
Single Photon Detectors ◽  
Quantum Internet

We present a single-photon entanglement concentration protocol for long-distance quantum communication with quantum nondemolition detector. It is the first concentration protocol for single-photon entangled states and it dose not require the two parties of quantum communication to know the accurate information about the coefficient $\alpha$ and $\beta$ of the less entangled states. Also, it does not resort to sophisticated single-photon detectors, which makes this protocol more feasible in current experiments. Moreover, it can be iterated to get a higher efficiency and yield. All these advantages maybe make this protocol have more practical applications in long-distance quantum communication and quantum internet.

scholarly journals Ge-on-Si single-photon avalanche diode detectors for short-wave infrared wavelengths

2021 ◽  
Author(s):  
Fiona Thorburn ◽  
Xin Yi ◽  
Zoe Greener ◽  
Jaroslaw Kirkoda ◽  
Ross Millar ◽  
...  
Keyword(s):  
High Performance ◽  
Single Photon ◽  
Wavelength Region ◽  
Short Wave ◽  
Single Photon Detection ◽  
Single Photon Detector ◽  
Photon Detectors ◽  
Long Distance ◽  
Single Photon Detectors ◽  
Short Wave Infrared

Abstract Germanium-on-Silicon (Ge-on-Si) based single-photon avalanche diodes (SPADs) have recently emerged as a promising detector candidate for ultra-sensitive and picosecond resolution timing measurement of short-wave infrared (SWIR) photons. Many applications benefit from operating in the SWIR spectral range, such as long distance Light Detection and Ranging (LiDAR), however, there are few single-photon detectors exhibiting the high-performance levels obtained by all-silicon SPADs commonly used for single-photon detection at wavelengths < 1 μm. This paper first details the advantages of operating at SWIR wavelengths, the current technologies, and associated issues, and describes the potential of Ge-on-Si SPADs as a single-photon detector technology for this wavelength region. The working principles, fabrication and characterisation processes of such devices are subsequently detailed. We review the research in these single-photon detectors and detail the state-of-the-art performance. Finally, the challenges and future opportunities offered by Ge-on-Si SPAD detectors are discussed.

scholarly journals Investigation of the parameters of a single photon detector for quantum communication

2021 ◽  
Vol 2140 (1) ◽  
pp. 012030
Author(s):  
K I Khomiakova ◽  
A P Kokhanenko ◽  
A V Losev
Keyword(s):  
Quantum Efficiency ◽  
Bias Voltage ◽  
Quantum Communication ◽  
Single Photon ◽  
Avalanche Photodiodes ◽  
Noise Levels ◽  
Photon Detector ◽  
Single Photon Detector ◽  
Photon Detectors ◽  
Single Photon Detectors

Abstract Nowadays the best single photon detectors from a practical view are those based on InGaAs/InP avalanche photodiodes, operating at a wavelength of 1.55 μm. The dependence of quantum efficiency and noise levels on the temperature and bias voltage of avalanche photodiodes were carried out.

Multi-channel quantum communication receiver made from waveguide-integrated superconducting nanowire single-photon detectors

2021 ◽  
Author(s):  
Matthias Häußler ◽  
Robin Terhaar ◽  
Helge Gehring ◽  
Martin A. Wolff ◽  
Fabian Beutel ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Single Photon ◽  
Photon Detectors ◽  
Single Photon Detectors ◽  
Superconducting Nanowire
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