Device Independent Quantum Key Activation

• URL: http://arxiv.org/abs/2506.09772v1
• Date: Wed, 11 Jun 2025 14:10:46 GMT
• Title: Device Independent Quantum Key Activation
• Authors: Bora Ulu, Nicolas Brunner, Mirjam Weilenmann,
• Abstract summary: Device-independent quantum key distribution (DIQKD) allows two distant parties to establish a secret key.<n>We consider a scenario where several copies of a given quantum distribution are jointly processed via a local and classical wiring operation.<n>We find that, under few assumptions, it is possible to activate device-independent key.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Device-independent quantum key distribution (DIQKD) allows two distant parties to establish a secret key, based only on the observed Bell nonlocal distribution. It remains however, unclear what the minimal resources for enabling DIQKD are and how to maximize the key rate from a given distribution. In the present work, we consider a scenario where several copies of a given quantum distribution are jointly processed via a local and classical wiring operation. We find that, under few assumptions, it is possible to activate device-independent key. That is, starting from a distribution that is useless in a DIQKD protocol, we obtain a positive key rate by wiring several copies together. We coin this effect device-independent key activation. Our analysis focuses on the standard DIQKD protocol with one-way post-processing, and we resort to semi-definite programming techniques for computing lower bounds on the key rate.

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