Experimental Demonstration of Coexistence of Classical and Quantum Communication in Quantum Key Distribution Link

Gokul, A and Natarajan, H and Raghunathan, V (2023) Experimental Demonstration of Coexistence of Classical and Quantum Communication in Quantum Key Distribution Link. In: UNSPECIFIED.

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Abstract

This paper presents a quantum key distribution (QKD) system that combines classical and quantum signals in a single optical channel for quantum key distribution application. We carefully optimize the communication link by placing the bright classical channel wavelength longer than the weak quantum one, number and specification of wavelength division multiplexers, and maximizing on-off extinction in the intensity modulator to minimize crosstalk of bright classical photons onto the quantum channel. Our experiments demonstrate a secret key rate (SKR) of 4.39 kbps for an emulated channel length of 65.5 km with less than 3 quantum bit error rate (QBER). The experimental study discussed here is relevant for utilization of existing optical fiber networks for QKD, making the system more robust for practical usage. © 2023 IEEE.

Item Type:	Conference Paper
Publication:	2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	24 May 2024 11:28
Last Modified:	24 May 2024 11:28
URI:	https://eprints.iisc.ac.in/id/eprint/84959

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