Experimental wavelength-space division multiplexing of quantum key distribution with classical optical communication over multicore fiber

Abstract

We demonstrate quantum key distribution (QKD) with classical signals in a seven-core fiber using dense wavelength division multiplexing. Quantum signals are transmitted in an outer core separately and intercore crosstalk (IC-XT) is the main impairment of them. In order to alleviate IC-XT, we propose a quantum-classical interleave scheme. Then the properties of IC-XT are analyzed based on the measurement results which indicate counter-propagation is a better co-existence method than co-propagation. Finally, we perform QKD experiments in the presence of two classical channels with a channel spacing of 100 GHz between quantum channel and the nearest classical channels. The experiment results prove counter-propagation almost immune to IC-XT, which is consistent with our analysis. Also, the feasibility of the transmission over the range of metropolitan area networks is validated with our scheme.

References in corpus (11)

• Quantum Cryptography
• Quantum cryptography: Public key distribution and coin tossing
• Space Division Multiplexing in Optical Fibres
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• Quantum key distribution over multicore fiber
• Investigation of channel model for weakly coupled multicore fiber

Cited by in corpus (5)

• Quantum information processing with space-division multiplexing optical fibres
• Intercore spontaneous Raman scattering impact on quantum key distribution in multicore fber
• The future of secure communications: device independence in quantum key distribution
• Implementation of space-division multiplexed entanglement-based quantum cryptography over multicore fiber
• Sub-femtosecond stabilization of multicore fiber for high-fidelity quantum networking at 100% duty cycle