Ultra-high bandwidth quantum secured data transmission

Abstract

Quantum key distribution (QKD) provides an attractive means for securing communications in optical fibre networks. However, deployment of the technology has been hampered by the frequent need for dedicated dark fibres to segregate the very weak quantum signals from conventional traffic. Up until now the coexistence of QKD with data has been limited to bandwidths that are orders of magnitude below those commonly employed in fibre optic communication networks. Using an optimised wavelength divisional multiplexing scheme, we transport QKD and the prevalent 100 Gb/s data format in the forward direction over the same fibre for the first time. We show a full quantum encryption system operating with a bandwidth of 200 Gb/s over a 100 km fibre. Exploring the ultimate limits of the technology by experimental measurements of the Raman noise, we demonstrate it is feasible to combine QKD with 10 Tb/s of data over a 50 km link. These results suggest it will be possible to integrate QKD and other quantum photonic technologies into high bandwidth data communication infrastructures, thereby allowing their widespread deployment.

References in corpus (5)

• Provably Secure and Practical Quantum Key Distribution over 307 km of Optical Fibre
• High speed single photon detection in the near-infrared
• Coexistence of high-bit-rate quantum key distribution and data on optical fiber
• Quantum key distribution over a 72 dB channel loss using ultralow dark count superconducting single-photon detectors
• Evolution of locally excited avalanches in semiconductors

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