Work

Countering detector manipulation attacks in quantum communication through detector self-testing

Year: 2025

Type: article

Abstract: In practical quantum key distribution systems, imperfect physical devices open security loopholes that challenge the core promise of this technology. Apart from various side channels, a vulnerability of single-photon detectors to blinding attacks has been one of the biggest concerns and has been addressed both by technical means as well as advanced protocols. In this work, we present a countermeasure against such attacks based on self-testing of detectors to confirm their intended operation without relying on specific aspects of their inner working and to reveal any manipulation attempts. We experimentally demonstrate this countermeasure with a typical InGaAs avalanche photodetector, but the scheme can be easily implemented with any single photon detector.

Source: APL Photonics

DOI: 10.1063/5.0233772

Authors: Lijiong Shen, Christian Kurtsiefer

Institutions: Centre for Quantum Technologies, Hangzhou Normal University, National University of Singapore

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,750

Funders: National Research Foundation, National Research Foundation Singapore, Ministry of Education - Singapore