Quantum walk-based protocol for secure communication between any two directly connected nodes on a network

Abstract

The utilization of quantum entanglement as a cryptographic resource has superseded conventional approaches to secure communication. Security and fidelity of intranetwork communication between quantum devices is the backbone of a quantum network. This work presents an algorithm that generates entanglement between any two directly connected nodes of a quantum network to be used as a resource to enable quantum communication across that pair in the network. The algorithm is based on a directed discrete-time quantum walk and paves the way for private inter-node quantum communication channels in the network. We also present the simulation results of this algorithm on random networks generated from various models. We show that after implementation, the probability of the walker being at all nodes other than the source and target is negligible, and this holds independent of the random graph generation model. This constitutes a viable method for the practical realisation of secure communication over any random network topology.

10 pages, 5 figures. Functionally identical to the published version

References in corpus (18)

• The Quantum Internet
• Classification of topological insulators and superconductors in three spatial dimensions
• Environment-Assisted Quantum Walks in Photosynthetic Energy Transfer
• Universal computation by quantum walk
• Spatial search by quantum walk
• Exploring Topological Phases With Quantum Walks
• Progress in satellite quantum key distribution
• Field and long-term demonstration of a wide area quantum key distribution network
• Symmetries, Topological Phases and Bound States in the One-Dimensional Quantum Walk
• Outline of the SECOQC Quantum-Key-Distribution Network in Vienna
• Optimizing the discrete time quantum walk using a SU(2) coin
• Perfect state transfer and efficient quantum routing: a discrete-time quantum walk approach
• Approaches for a quantum memory at telecommunication wavelengths
• Faster transport with a directed quantum walk
• Bounds on the dynamics of periodic quantum walks and emergence of the gapless and gapped Dirac equation
• Classical Artificial Neural Network Training Using Quantum Walks as a Search Procedure
• Deterministic spatial search using alternating quantum walks
• Quantum Walk to Train a Classical Artificial Neural Network