Proof-of-Principle Demonstration of Fully-Passive Quantum Key
Distribution
- URL: http://arxiv.org/abs/2304.10374v2
- Date: Tue, 9 May 2023 14:30:11 GMT
- Title: Proof-of-Principle Demonstration of Fully-Passive Quantum Key
Distribution
- Authors: Chengqiu Hu, Wenyuan Wang, Kai-Sum Chan, Zhenghan Yuan, Hoi-Kwong Lo
- Abstract summary: Quantum key distribution (QKD) offers information-theoretic security based on the fundamental laws of physics.
Device imperfections, such as those in active modulators, may introduce side-channel leakage.
Our work demonstrates the feasibility of active-modulation-free QKD in polarization-encoded systems.
- Score: 2.4149105714758545
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum key distribution (QKD) offers information-theoretic security based on
the fundamental laws of physics. However, device imperfections, such as those
in active modulators, may introduce side-channel leakage, thus compromising
practical security. Attempts to remove active modulation, including passive
decoy intensities preparation and polarization encoding, have faced theoretical
constraints and inadequate security verification, thus hindering the
achievement of a fully passive QKD scheme. Recent research has systematically
analyzed the security of a fully passive modulation protocol. Based on this, we
utilize the gain-switching technique in combination with the post-selection
scheme and perform a proof-of-principle demonstration of a fully passive
quantum key distribution with polarization encoding at channel losses of 7.2
dB, 11.6 dB, and 16.7 dB. Our work demonstrates the feasibility of
active-modulation-free QKD in polarization-encoded systems.
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