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High-security communication by coherence modulation at the photon-counting level

机译：通过光子计数级别的相干调制进行的高安全性通信

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摘要

We show that key-specified interferometer path-length difference modulation (often referred to as coherence modulation), operating in the photon-counting regime with a broadband source, can provide a quantifiably high level of physics-guaranteed security for binary signal transmission. Each signal bit is associated with many photo-counts, perhaps numbering in the thousands. Of great importance, the presence of an eavesdropper can be quickly detected. We first review the operation of key-specified coherence modulation at high light levels, illustrating by means of an example its lack of security against attack. We then show, using the same example, that, through the reduction of light intensities to photon-counting levels, a high level of security can be attained. A particular attack on the system is analyzed to demonstrate the quantifiability of the scheme's security, and various remaining research issues are discussed. A potential weakness of the scheme lies in a possible vulnerability to light amplification by an attacker. (C) 2016 Optical Society of America
机译：我们表明，在具有宽带源的光子计数状态下运行的，关键指定的干涉仪光程差调制（通常称为相干调制）可以为二进制信号传输提供可量化的高物理保证安全性。每个信号位都与许多照片计数相关联，可能有数千个计数。非常重要的是，可以快速检测到窃听者的存在。我们首先回顾高亮度下密钥指定的相干调制的操作，并通过示例说明其缺乏针对攻击的安全性。然后，使用同一示例显示，通过将光强度降低到光子计数级别，可以实现很高的安全性。分析了对该系统的特定攻击，以证明该方案的安全性是可量化的，并讨论了各种剩余的研究问题。该方案的潜在弱点在于攻击者可能容易放大光。 （C）2016美国眼镜学会

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