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AKPIK: Arbeitskreis Physik, moderne Informationstechnologie und Künstliche Intelligenz

AKPIK 6: AI Methods for Physics and Materials Science

AKPIK 6.1: Vortrag

Donnerstag, 12. März 2026, 16:45–17:00, BEY/0127

Recycling resources from aborted quantum key distribution protocols — •Siyuan Qi and Ramona Wolf — Universität Siegen, Siegen, Germany

In quantum key distribution protocols, abortion often occurs due to detected errors or leakages. A secure protocol must ensure that if abortion does not occur, the generated key is secure. However, when abortion happens, the resources used are lost and cannot be reused, leading to waste. A malicious party, Eve, can exploit this by intentionally interfering with the protocol, forcing an abortion every time it’s run. While Eve cannot obtain the secret key or avoid detection, she can prevent key generation and cause significant resource waste, which is undesirable in practical scenarios. This issue can be addressed by implementing procedures that recycle resources from aborted protocols or an “escalation” where we use protocols that reduce leakage or detect correlations better. A protocol is aborted when the minimum entropy of the key generated does not exceed the leakage. Our recycling-or-escalation scheme can be realized by the following methods: better estimation of minimum entropy; directly using the minimum entropy for other tasks; better estimation of leakage; directly preventing leakage from occurring at all. This presentation focuses on one realization of the last method where we encode the error correction syndromes into quantum data-locked state.

Keywords: Quantum Cryptography; Quantum Key Distribution; Anonymous Quantum Key Distribution; Protocol Robustness; Private Randomness Generation