Routing and Spectrum Allocation in Broadband Quantum Entanglement Distribution

• URL: http://arxiv.org/abs/2404.08744v3
• Date: Mon, 30 Dec 2024 18:10:10 GMT
• Title: Routing and Spectrum Allocation in Broadband Quantum Entanglement Distribution
• Authors: Rohan Bali, Ashley N. Tittelbaugh, Shelbi L. Jenkins, Anuj Agrawal, Jerry Horgan, Marco Ruffini, Daniel C. Kilper, Boulat A. Bash,
• Abstract summary: We investigate resource allocation for quantum entanglement over an optical network.<n>We develop a routing and spectrum allocation scheme for distributing entangled photon pairs over such a network.<n>We find that a spectrum allocation approach that achieves higher minimum EPR-pair rate can perform significantly worse when the median EPR-pair rate, Jain index, and computational resources are considered.
• Score: 4.404652389362312
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate resource allocation for quantum entanglement distribution over an optical network. We characterize and model a network architecture that employs a single broadband quasi-deterministic time-frequency heralded Einstein-Podolsky-Rosen (EPR) pair source, and develop a routing and spectrum allocation scheme for distributing entangled photon pairs over such a network. As our setting allows separately solving the routing and spectrum allocation problems, we first find an optimal polynomial-time routing algorithm. We then employ max-min fairness criterion for spectrum allocation, which presents an NP-hard problem. Thus, we focus on approximately-optimal schemes. We compare their performance by evaluating the max-min and median number of EPR-pair rates assigned by them, and the associated Jain index. We identify two polynomial-time approximation algorithms that perform well, or better than others under these metrics. We also investigate scalability by analyzing how the network size and connectivity affect performance using Watts-Strogatz random graphs. We find that a spectrum allocation approach that achieves higher minimum EPR-pair rate can perform significantly worse when the median EPR-pair rate, Jain index, and computational resources are considered. Additionally, we evaluate the effect of the source node placement on the performance.

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