Light Source Monitoring in Quantum Key Distribution with Single Photon Detector at Room Temperature
| Autor: | Yucheng Qiao, Gan Wang, Zhengyu Li, Ziyang Chen, Xiang Peng, Hong Guo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Quantum Physics Photon Dark count rate business.industry Detector Photon detector FOS: Physical sciences 02 engineering and technology Quantum key distribution 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Light source Optics 0103 physical sciences Electrical and Electronic Engineering Photonics 010306 general physics 0210 nano-technology business Quantum Physics (quant-ph) |
| Popis: | Photon number resolving monitoring is a practical light source monitoring scheme in quantum key distribution (QKD) systems and can, effectively, reduce the risks due to the effects of untrusted sources. This scheme requires a single-photon detector, normally working at low temperature to suppress its dark count rate. In this paper, we use a room-temperature detector and show that the dark count rate is nearly irrelevant to the monitoring performance in our scheme, thus can sufficiently reduce the afterpulsing effect of the detectors as well as relax the requirements on their working conditions and integration complexity, which would be highly desirable for practical high-speed QKD systems with imperfect sources. Furthermore, the influences of parameter drifts at room temperature are analyzed, and the monitoring scheme is testified in a real QKD system. |
| Databáze: | OpenAIRE |
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