Controlling passively quenched single photon detectors by bright light
Controlling passively quenched single photon detectors by bright light
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DOI：
10.1088/1367-2630/11/6/065003
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发表时间：
2009-06-12
影响因子：
3.3
通讯作者：
Makarov, Vadim
中科院分区：
文献类型：
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作者：
Makarov, Vadim
基于被动淬火的雪崩光电二极管的单光子检测器（SPD）可以被相对明亮的光暂时蒙蔽，其强度小于1 NW。本文描述了适合攻击包含此类探测器的量子密钥分布系统的明亮光明制度。在这个制度中，接收器鲍勃（Bob）中的所有SPD都被窃听的前夕带来的连续照明而均匀地蒙蔽了双眼。当EVE需要BOB中的某个检测器来产生点击时，她会修改她发送到BOB的光的量子量的极化（或其他用于编码量子状态的参数），以使目标检测器停止接收光，而另一个检测器（S）继续照亮。目标检测器会恢复单个光子灵敏度，并且当EVE再次修改极化时，会产生单击。因此，夏娃完全控制了鲍勃，可以进行成功的拦截攻击。为了检查攻击的可行性，已经测试了三种不同的被动检测器模型。在实验中，我模拟了检测器在攻击下的真实QKD系统中收到的强度图。考虑控制参数和副作用。看来攻击实际上是可能的。
Single photon detectors (SPDs) based on passively quenched avalanche photodiodes can be temporarily blinded by relatively bright light, of intensity less than 1 nW. A bright-light regime suitable for attacking a quantum key distribution system containing such detectors is described in this paper. In this regime, all SPDs in the receiver Bob are uniformly blinded by continuous illumination coming from the eavesdropper Eve. When Eve needs a certain detector in Bob to produce a click, she modifies the polarization (or other parameters used to encode quantum states) of the light she sends to Bob such that the target detector stops receiving light, while the other detector(s) continue to be illuminated. The target detector regains single photon sensitivity and, when Eve modifies the polarization again, produces a single click. Thus, Eve has full control of Bob and can perform a successful intercept-resend attack. To check the feasibility of the attack, three different models of passively quenched detectors have been tested. In the experiment, I have simulated the intensity diagrams the detectors would receive in a real QKD system under attack. Control parameters and side effects are considered. It appears that the attack could be practically possible.