Balanced, gated-mode photon detector for quantum-bit discrimination at 1550 nm.
Balanced, gated-mode photon detector for quantum-bit discrimination at 1550 nm.
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DOI：
10.1364/ol.27.001827
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发表时间：
2002-06
期刊：
影响因子：
3.6
通讯作者：
A. Tomita;Kazuo Nakamura
中科院分区：
文献类型：
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作者：
A. Tomita;Kazuo Nakamura
结合两个雪崩光电二极管（APD）的光子探测器已被证明在1550 nm的量子位歧视。在门控模式下，由两个APD的平衡输出抵消了伴随信号的尖峰。尖峰消除使得能够降低鉴别器中的阈值，从而降低栅极脉冲电压。在178 K下，暗计数概率和后脉冲概率分别降低到7 × 10 ~（-7）和7 × 10 ~（-4），而探测效率（11%）没有受到影响。
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 7x10(-7) and 7x10(-4) , respectively, without affecting the detection efficiency (11%) at 178 K.