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Optical Fiber Communication Conference

Quantum key distribution for reconfigurable optical networks (invited)

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

Published Jan 1, 2006• 3 citations
Publisher

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
DOI
10.1109/ofc.2006.216004

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Secure networks composed of optical networks and quantum key distribution (QKD) are considered in this paper. A network layer structure is defined to focus on issues important with respect to the QKD network layer that controls QKD links and supplies a secure key for message transmission. A multiple-user QKD network layer can be constructed with timing synchronization, secure key sharing between indirectly connected nodes with switched QKD systems and key relays, and key management to control the volume of key generation and supply in response to the demand from optical network nodes.
In this paper, we demonstrate for the first time, the coexistence architectures which enable quantum cryptographic systems to use the emerging optical network infrastructure. A vision of a future network that combines classical optical communications with ultra-low power quantum signals over a shared, reconfigurable fiber infrastructure is illustrated. We have used a fiber quantum key distribution (QKD) system to experimentally measure the effective QKD throughput for various types of optical switch elements, including opto-mechanical, lithium niobate, and 2D MEMS. We have investigated QKD coexistence with a commercial EDFA-amplified DWDM system using the experimental setup. These results are an important first step for scaling QKD beyond dedicated point-to-point fiber links and provide a context for understanding the applicability of QKD to the broader optical networking environment.