Breaking Quantum Key Distributions under Quantum Switch-Based Attack
Quantum Physics
2025-02-11 v1
Abstract
Quantum key distribution (QKD) enables secure key sharing between distant parties, with several protocols proven resilient against conventional eavesdropping strategies. Here, we introduce a new attack scenario where an eavesdropper, Eve, exploits a quantum switch using the indefinite causal order to intercept and manipulate quantum communication channel. Using multiple metrics such as the information gain, mutual information, and Bell violation, we demonstrate that the presence of a quantum switch significantly compromises QKD security. Our results highlight a previously overlooked vulnerability, emphasizing the need for countermeasures against quantum-controlled adversarial strategies.
Cite
@article{arxiv.2502.06780,
title = {Breaking Quantum Key Distributions under Quantum Switch-Based Attack},
author = {Sumit Nandi and Biswaranjan Panda and Pankaj Agrawal and Arun K Pati},
journal= {arXiv preprint arXiv:2502.06780},
year = {2025}
}