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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Advances on Chip-Based QKD in Bristol Quantum Network

Djeylan Aktas, Lawrence M. Rosenfeld, Friederike Jöhlinger, Elliott Hastings, John Rarity

Published Jun 21, 2021• 0 citations
Publisher

Abstract

Quantum Key Distribution (QKD) provides a provably secure approach to share keys used to encrypt secret information by transmitting single photons [1] . This is one of the first commercial quantum technologies available, and Bristol is heavily involved in UK Quantum Communications Hub to develop a chip-based approach and integrate them in our 5G-UK network testbed.

DOI
10.1109/cleo/europe-eqec52157.2021.9542213

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Quantum key distribution (QKD) is one of the most commercially-advanced quantum optical technologies operating in the single-photon regime. The commercial success of this disruptive technology relies on customer trust. Network device manufacturers have to meet stringent standards in order to ensure the operational security of their devices. The National Physical Laboratory (NPL) and the University of Bristol (Bristol) are working to produce a suite of tests to determine the operating characteristics and implementation security of chip-scale quantum devices designed for security purposes. These tests will inform and provide assurance to potential customers of such devices. Results from initial measurements performed on the Bristol chip-scale transmitter and receiver are presented, with the aim of informing the development of the system.
Quantum key distribution (QKD) is an innovative technology allowing information-theoretically-secure key sharing among distant users relying only on fundamental rules of quantum physics, without assumptions about the computational power of the attacker [1]. Different variants of this technology are making their way into the market since several years and QKD testbeds are under deployment worldwide, for institutional and commercial use. Among the remaining challenges, its integration in existing infrastructure is a vital one, together with the hybridization with different technologies.
Quantum Security The deployment of quantum technologies will be reliant on developing platforms that are mass-manufacturable and cost-effective. Quantum key distribution is a protocol that ensures secure communications between various parties within a network using shared secret keys to encrypt the communication channels. However, practical implementations with hybrid systems can leave side channels open, which compromises the security of the network. Semenenko et al. demonstrate a quantum-ready platform based on all the optical components being monolithically integrated on an indium-phosphide photonic chip. With the side channels to information leakage effectively closed and demonstrated secret keys exchanged at rates exceeding 1 kilobit per second over 100 kilometers, such a platform provides a promising solution for the development of secure communication over citywide quantum networks. Optica 7 , 238 (2020).
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Quantum Key Distribution (QKD) networks have emerged the revolutionary technology in ensuring secure communication in the digital age. By utilizing the principles of quantum mechanics, QKD allows two parties to establish a secret key securely, which can subsequently be used for encrypting and decrypting sensitive information. While QKD holds immense promise for enhancing cybersecurity, it also presents several challenges that necessitate further research to achieve its full potential. The research presented here examines the development of QKD networks, their real-world use, as well as the general QKD network architecture and the most recent advancements in QKD network deployments.