NDLI: Measurement-Device-Independent Quantum Key Distribution Based on Decoherence-Free Subspaces with Logical Bell State Analyzer.

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Measurement-Device-Independent Quantum Key Distribution Based on Decoherence-Free Subspaces with Logical Bell State Analyzer.

Content Provider	Europe PMC
Author	Wei, Jun-Hao Xu, Xin-Yu Hu, Shu-Ming Zhou, Qing Li, Li Liu, Nai-Le Chen, Kai
Editor	Djordjevic, Ivan B.
Copyright Year	2023
Abstract	Measurement-device-independent quantum key distribution (MDI-QKD) enables two legitimate users to generate shared information-theoretic secure keys with immunity to all detector side attacks. However, the original proposal using polarization encoding is sensitive to polarization rotations stemming from birefringence in fibers or misalignment. To overcome this problem, here we propose a robust QKD protocol without detector vulnerabilities based on decoherence-free subspaces using polarization-entangled photon pairs. A logical Bell state analyzer is designed specifically for such encoding. The protocol exploits common parametric down-conversion sources, for which we develop a MDI-decoy-state method, and requires neither complex measurements nor a shared reference frame. We have analyzed the practical security in detail and presented a numerical simulation under various parameter regimes, showing the feasibility of the logical Bell state analyzer along with the potential that double communication distance can be achieved without a shared reference frame.
Journal	Entropy (Basel, Switzerland)
Volume Number	25
PubMed Central reference number	PMC10297261
Issue Number	6
PubMed reference number	37372213
e-ISSN	10994300
DOI	10.3390/e25060869
Language	English
Publisher	MDPI
Publisher Date	2023-05-29
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors.
Subject Keyword	quantum key distribution measurement-device-independent decoherence-free subspace logical Bell state
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Information Systems Electrical and Electronic Engineering Mathematical Physics

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