Illinois Express Quantum Network (IEQNET): Metropolitan-scale experimental quantum networking over deployed optical fiber
Joaquin Chung, Gregory Kanter, Nikolai Lauk, Raju Valivarthi, Wenji, Wu, Russell R. Ceballos, Cristi\'an Pe\~na, Neil Sinclair, Jordan Thomas, Si, Xie, Rajkumar Kettimuthu, Prem Kumar, Panagiotis Spentzouris, Maria Spiropulu

TL;DR
IEQNET demonstrates metro-scale quantum networking over deployed optical fiber using SDN technology, showcasing entanglement distribution and quantum teleportation in a real-world urban environment.
Contribution
This work introduces a layered network architecture for quantum networks utilizing SDN, enabling coexistence of quantum and classical channels over the same fiber.
Findings
Successful entanglement distribution across multiple sites
Implementation of SDN for quantum network control
Coexistence of quantum and classical channels in deployed fiber
Abstract
The Illinois Express Quantum Network (IEQNET) is a program to realize metro-scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Q-nodes) representing the communication parties in a quantum network. Q-nodes generate or measure quantum signals such as entangled photons and communicate the results via standard, classical, means. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined-networking (SDN) technology to perform traditional wavelength routing and assignment between the…
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