Layered Quantum Key Distribution
Matej Pivoluska, Marcus Huber, Mehul Malik

TL;DR
This paper proposes a family of quantum key distribution protocols utilizing multi-partite high-dimensional quantum states to efficiently distribute shared keys among multiple users, including broadcast keys, with practical implementation considerations.
Contribution
Introduces a novel family of QKD protocols leveraging multi-partite high-dimensional states for flexible and efficient key sharing in quantum networks.
Findings
Protocols can implement any key structure within a network.
More efficient than bipartite QKD in channel usage.
Protocols are feasible with current quantum photonic technology.
Abstract
We introduce a family of QKD protocols for distributing shared random keys within a network of users. The advantage of these protocols is that any possible key structure needed within the network, including broadcast keys shared among subsets of users, can be implemented by using a particular multi-partite high-dimensional quantum state. This approach is more efficient in the number of quantum channel uses than conventional quantum key distribution using bipartite links. Additionally, multi-partite high-dimensional quantum states are becoming readily available in quantum photonic labs, making the proposed protocols implementable using current technology.
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