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	Author	Zolotov, P.; Divochiy, A.; Vakhtomin, Y.; Moshkova, M.; Morozov, P.; Seleznev, V.; Smirnov, K.
	Title	Photon-number-resolving SSPDs with system detection efficiency over 50% at telecom range			Type	Conference Article
	Year	2018	Publication	Proc. AIP Conf.	Abbreviated Journal
	Volume	1936	Issue	1	Pages	020019
	Keywords	NbN PNR SSPD, SNSPD
	Abstract	We used technology of making high-efficiency superconducting single-photon detectors as a basis for improvement of photon-number-resolving devices. By adding optical cavity and using an improved NbN superconducting film, we enhanced previously reported system detection efficiency at telecom range for such detectors. Our results show that implementation of optical cavity helps to develop four-section device with quantum efficiency over 50% at 1.55 µm. Performed experimental studies of detecting multi-photon optical pulses showed irregularities over defining multi-photon through single-photon quantum efficiency.
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	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	doi:10.1063/1.5025457			Serial	1231
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