Mitigating imperfections in Differential Phase Shift Measurement-Device-Independent Quantum Key Distribution via Plug-and-Play architecture

• URL: http://arxiv.org/abs/2409.05802v1
• Date: Mon, 9 Sep 2024 17:08:44 GMT
• Title: Mitigating imperfections in Differential Phase Shift Measurement-Device-Independent Quantum Key Distribution via Plug-and-Play architecture
• Authors: Nilesh Sharma, Shashank Kumar Ranu, Prabha Mandayam, Anil Prabhakar,
• Abstract summary: Measurement-device-independent quantum key distribution (MDI-QKD) was originally proposed as a means to address the issue of detector side-channel attacks. We present a plug-and-play scheme for MDI-QKD based on differential phase shift (DPS) encoding.
• Score: 1.8501505150450435
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Measurement-device-independent quantum key distribution (MDI-QKD) was originally proposed as a means to address the issue of detector side-channel attacks and enable finite secure key rates over longer distances. However, the asymmetric characteristics of the channels from the two sources to the measurement device in MDI-QKD impose constraints on successfully extracting a secure key. In this work, we present a plug-and-play scheme for MDI-QKD based on differential phase shift (DPS) encoding. Specifically, we analyze the effects of pulse-width mismatch and polarization mismatch between the pulses arriving at the measurement device. The polarization mismatch is modeled with an assumption of sharing a common reference frame, and the maximum allowable mismatch is found to be 11 degrees. Furthermore, we show that a channel length asymmetry of 176.5 km results in Hong-Ou-Mandel interference visibility of 0.37, thereby leading to zero secure key rates for a polarization-based MDI-QKD protocol. We then present a plug-and-play architecture for DPS-MDI-QKD as a solution to some of these issues, thereby paving the way for practical implementations of MDI protocols.

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