Quantum Pulse Gate Attack on IM/DD Optical Key Distribution Exploiting Symbol Shape Distortion

• URL: http://arxiv.org/abs/2503.14105v1
• Date: Tue, 18 Mar 2025 10:19:35 GMT
• Title: Quantum Pulse Gate Attack on IM/DD Optical Key Distribution Exploiting Symbol Shape Distortion
• Authors: M. Jarzyna, M. Jachura, K. Banaszek,
• Abstract summary: Intensity modulation/direct detection (IM/DD) optical key distribution (OKD) is a method to generate a secret key.<n>Here the effects of intensity-dependent symbol shape distortion on the IM/DD OKD security are investigated.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Intensity modulation/direct detection (IM/DD) optical key distribution (OKD) is a method to generate a secret key whose security against passive eavesdropping is guaranteed by the shot noise inherent to the photodetection process. Here the effects of intensity-dependent symbol shape distortion on the IM/DD OKD security are investigated assuming that the eavesdropper can implement temporal mode demultiplexing using e.g the quantum pulse gating technique. The quantitative analysis includes key generation based on either hard- or soft-decoding of the detected signal as well as the impact of excess detection noise. A simple rule-of-thumb relation between the severity of the symbol shape distortion and the signal strength required to ensure key security is presented.

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