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IET conference proceedings.

Quantum teleportation over optical fibers carrying conventional classical communications traffic

Jordan M. Thomas, Feng-Hao Yeh, Jianfeng Chen, Joe Mambretti, Scott J. Kohlert, Gregory S. Kanter, Prem Kumar

Published Nov 13, 2023• 1 citation
Publisher

Abstract

The scalability of quantum networking will benefit from the ability to operate beyond dark fibers. We report the first demonstration of quantum teleportation coexisting with conventional communications, where quantum state transfer is achieved over 10.5 km SMF-28 fiber simultaneously carrying a 400 Gbps classical signal.
DOI
10.1049/icp.2023.2671

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Quantum communications is an emerging field with many promising applications. Its usefulness and range of applicability in optical fiber will depend strongly on the extent to which quantum channels can be reliably transported over transparent reconfigurable optical networks, rather than being limited to dedicated point-to-point links. This presents a number of challenges, particularly when single-photon quantum and much higher power classical optical signals are combined onto a single physical infrastructure to take advantage of telecom networks built to carry conventional traffic. In this paper, we report on experimental demonstrations of successful quantum key distribution (QKD) in this complex environment, and on measurements of physical-layer impairments, including Raman scattering from classical optical channels, which can limit QKD performance. We then extend the analysis using analytical models incorporating impairments, to investigate QKD performance while multiplexed with conventional data channels at other wavelengths. Finally, we discuss the implications of these results for evaluating the most promising domains of use for QKD in real-world optical networks.