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Optical Fiber Communication Conference

Quantum Key Distribution for Reconfigurable Optical Networks

Robert J. Runser, Thomas E. Chapuran, P. Toliver, Matthew S. Goodman, Richard Hughes, Charles G. Peterson, Kevin P. McCabe, J. E. Nordholt, Kush Tyagi, Philip A. Hiskett, Nicholas A. Dallmann

Published Mar 5, 2006• 4 citations
OpenAlex

Abstract

Recent advances in quantum key distribution (QKD) systems for optical networks are presented including a system that is compatible with dynamic reconfiguration of the quantum channel using optical switches.

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Modern optical networking techniques have the potential to greatly extend the applicability of quantum communications by moving beyond simple point-to-point optical links and by leveraging existing fibre infrastructures. We experimentally demonstrate many of the fundamental capabilities that are required. These include optical-layer multiplexing, switching and routing of quantum signals; quantum key distribution (QKD) in a dynamically reconfigured optical network; and coexistence of quantum signals with strong conventional telecom traffic on the same fibre. We successfully operate QKD at 1310 nm over a fibre shared with four optically amplified data channels near 1550 nm. We identify the dominant impairment as spontaneous anti-Stokes Raman scattering of the strong signals, quantify its impact, and measure and model its propagation through fibre. We describe a quantum networking architecture which can provide the flexibility and scalability likely to be critical for supporting widespread deployment of quantum applications.