Intensity modulation as a preemptive measure against blinding of single-photon detectors based on self-differencing cancellation
Intensity modulation as a preemptive measure against blinding of single-photon detectors based on self-differencing cancellation
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DOI：
10.1103/physreva.98.022327
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发表时间：
2018-08-22
影响因子：
2.9
通讯作者：
Shields, Andrew J.
中科院分区：
文献类型：
--
作者：
Koehler-Sidki, Alexander;Lucamarini, Marco;Shields, Andrew J.
量子密钥分发作为一种重要的密码学原语正在崛起，用于保护数字时代的通信基础设施。但是，其实现安全性经常被行为偏离预期的组件所削弱。在这里，我们分析了自差分雪崩光电二极管（高速量子密钥分发的关键推动者）对连续波激光器发出的强光的响应。在不正确的设置下，由自差分电路引起的抵消会使探测器对单光子不敏感。然而，我们的实验表明，即使在这种情况下，强度调制可以作为一种有效的措施来恢复检测器的预期响应输入光。
Quantum key distribution is rising as an important cryptographic primitive for protecting the communication infrastructure in the digital era. However, its implementation security is often weakened by components whose behavior deviates from what is expected. Here we analyze the response of a self-differencing avalanche photodiode, a key enabler for high speed quantum key distribution, to intense light shone from a continuous-wave laser. Under incorrect settings, the cancellation entailed by the self-differencing circuitry can make the detector insensitive to single photons. However, we experimentally demonstrate that even in such cases intensity modulation can be used as an effective measure to restore the detector's expected response to the input light.