Balanced, gated-mode photon detector for quantum-bit discrimination at 1550 nm

被引：116
作者：
Tomita, A [1 ]
Nakamura, K [1 ]
机构：
[1] NEC Corp Ltd, Fundamental Res Labs, Japan Sci & Technol,Exploratory Res Adv Technol, Quantum Computat & Informat Project, Tsukuba, Ibaraki 3058501, Japan
来源：
OPTICS LETTERS | 2002年 / 27卷 / 20期
关键词：
D O I：
10.1364/OL.27.001827
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A photon detector that combines two avalanche photodiodes (APDs) has been demonstrated for quantum-bit discrimination at 1550 nm. Spikes accompanied by signals in a gated mode were canceled by balanced output from the two APDs. The spike cancellation enabled one to reduce the threshold in the discriminators and thus the gate pulse voltage. The dark count probability and afterpulse probability were reduced to 7 X 10(-7) and 7 X 10(-4), respectively, without affecting the detection efficiency (11%) at 178 K. (C) 2002 Optical Society of America.
引用
收藏
页码：1827 / 1829
页数：3
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