Dirac pointed out that one of the only ways to measure a particle's position is by bouncing a photon off of it, and seeing where and how that photon lands on a detector.

狄拉克指出唯一的方法就是通过反弹一个光子，并观察它在检测器上的位置和轨迹来测量一个粒子的位置。

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Firstly, based on the analysis of some implementations of BB84 protocol, we developed a scheme of quantum key distribution by using polarization encoding and only one single photon detector.

首先，在研究BB 84协议各种具体实现方法的基础上，提出了一种基于偏振编码的量子密钥分发方案，该方案仅使用一台单光子探测器。

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This detector is a kind of photon counting imaging detectors, which has some properties such as high gain, small distortion and high resolution.

该探测器属于光子计数成像探测器，具有增益高、图像畸变小、分辨率高等优点。

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Their eavesdropping apparatus (which is small enough to fit in a suitcase) was designed to take advantage of a weakness in a particular sort of photon detector in Bob's receiving equipment.

ECONOMIST: Secure cryptography is only as safe as its weakest link