Towards Fully Passive Time-Bin Quantum Key Distribution over Multi-Mode Channels

• URL: http://arxiv.org/abs/2302.05038v2
• Date: Tue, 14 Nov 2023 05:05:07 GMT
• Title: Towards Fully Passive Time-Bin Quantum Key Distribution over Multi-Mode Channels
• Authors: Ramy Tannous, Wilson Wu, St\'ephane Vinet, Chithrabhanu Perumangatt, Dogan Sinar, Alexander Ling, Thomas Jennewein
• Abstract summary: Phase stabilization of distant quantum time-bin interferometers is a major challenge for quantum communication networks. We demonstrate a novel approach using reference frame independent time-bin quantum key distribution. This is achieved without any mode filtering, mode sorting, adaptive optics, active basis selection, or active phase alignment.
• Score: 37.69303106863453
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Phase stabilization of distant quantum time-bin interferometers is a major challenge for quantum communication networks, and is typically achieved by exchanging optical reference signals, which can be particularly challenging over free-space channels. We demonstrate a novel approach using reference frame independent time-bin quantum key distribution that completely avoids the need for active relative phase stabilization while simultaneously overcoming a highly multi-mode channel without any active mode filtering. We realized a proof-of-concept demonstration using hybrid polarization and time-bin entangled photons, that achieved a sustained asymptotic secure key rate of greater than 0.06 bits/coincidence over a 15m multi-mode fiber optical channel. This is achieved without any mode filtering, mode sorting, adaptive optics, active basis selection, or active phase alignment. This scheme enables passive self-compensating time-bin quantum communication which can be readily applied to long-distance links and various wavelengths, and could be useful for a variety of spatially multi-mode and fluctuating channels involving rapidly moving platforms, including airborne and satellite systems.

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