Setting best practice criteria for self-differencing avalanche photodiodes in quantum key distribution
Setting best practice criteria for self-differencing avalanche photodiodes in quantum key distribution
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DOI：
10.1117/12.2275675
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
A. Koehler-Sidki;J. Dynes;Marco Lucamarini;G. L. Roberts;A. Sharpe;S. Savory;Zhiliang Yuan;A. Shields
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文献类型：
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作者：
A. Koehler-Sidki;J. Dynes;Marco Lucamarini;G. L. Roberts;A. Sharpe;S. Savory;Zhiliang Yuan;A. Shields
近年来，雪崩光电二极管作为量子密钥分发的单光子探测器的安全性受到了广泛的关注。最突出的例子是这类设备在强光照射下易致盲。我们关注的是自差分雪崩光电二极管，这是一种计数速率超过1GCounts/S的单光子探测器，其安全密钥速率超过1Mbit/S。这些探测器使用无源电子电路来消除任何周期信号，从而提高检测灵敏度。然而，攻击者可以利用这一固有功能，使用中等强度的照明来获得对设备的控制。通过仔细的实验检查，我们在这里为这些检测器定义了一套避免此类攻击的标准。
In recent years, the security of avalanche photodiodes as single photon detectors for quantum key distribution has been subjected to much scrutiny. The most prominent example of this surrounds the vulnerability of such devices to blinding under strong illumination. We focus on self-differencing avalanche photodiodes, single photon detectors that have demonstrated count rates exceeding 1 GCounts/s resulting in secure key rates over 1 MBit/s. These detectors use a passive electronic circuit to cancel any periodic signals thereby enhancing detection sensitivity. However this intrinsic feature can be exploited by adversaries to gain control of the devices using illumination of a moderate intensity. Through careful experimental examinations, we define here a set of criteria for these detectors to avoid such attacks.