Layered Quantum Key Distribution

Abstract

We introduce a family of QKD protocols for distributing shared random keys within a network of $n$ 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.

11 pages, 5 figures. In version 2 we extended section 4 about the dimension-rate trade-off and corrected minor errors

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• The structure of multidimensional entanglement in multipartite systems
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• Fully device independent Conference Key Agreement
• Generation of the Complete Four-dimensional Bell Basis
• Purification of genuine multipartite entanglement
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• Quantum Experiments and Graphs III: High-Dimensional and Multi-Particle Entanglement
• Noise-Robust and Loss-Tolerant Quantum Steering with Qudits
• Coherent one-way quantum conference key agreement based on twin field
• Multipartite entanglement outperforming bipartite entanglement under limited quantum system sizes
• Scientific intuition inspired by machine learning generated hypotheses
• Experimental creation of Multi-Photon High-Dimensional Layered Quantum States
• Simultaneously sorting overlapping quantum states of light
• Digital Discovery of 100 diverse Quantum Experiments with PyTheus
• High key rate quantum conference key agreement with unconditional security
• Dissipative stabilization of high-dimensional GHZ states for neutral atoms
• Genuine multipartite nonlocality with causal-diagram postselection
• Efficient High-dimensional Quantum Key Distribution with Hybrid Encoding
• Quantum and semi--quantum key distribution in networks
• Entangling independent particles by path identity
• Deterministic transformations of three-qubit entangled pure states
• Coincidence postselection for genuine multipartite nonlocality: Causal diagrams and threshold efficiencies
• Metrology-assisted entanglement distribution in noisy quantum networks
• Integrated semi-quantum layered communication
• Heralded High-Dimensional Photon-Photon Quantum Gate
• Graph-theoretic insights on the constructability of complex entangled states
• Detecting genuine multipartite entanglement in multi-qubit devices with restricted measurements
• Experimental verification of multi-copy activation of genuine multipartite entanglement
• Sharing classical secrets with continuous-variable entanglement: Composable security and network coding advantage
• Lorentz invariants of pure three-qubit states