CUED Publications database

Coexistence of high-bit-rate quantum key distribution and data on optical fiber

Patel, KA and Dynes, JF and Choi, I and Sharpe, AW and Dixon, AR and Yuan, ZL and Penty, RV and Shields, AJ (2012) Coexistence of high-bit-rate quantum key distribution and data on optical fiber. Physical Review X, 2. 041010-.

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Abstract

Quantum key distribution (QKD) uniquely allows distribution of cryptographic keys with security verified by quantum mechanical limits. Both protocol execution and subsequent applications require the assistance of classical data communication channels. While using separate fibers is one option, it is economically more viable if data and quantum signals are simultaneously transmitted through a single fiber. However, noise-photon contamination arising from the intense data signal has severely restricted both the QKD distances and secure key rates. Here, we exploit a novel temporal-filtering effect for noise-photon rejection. This allows high-bit-rate QKD over fibers up to 90 km in length and populated with error-free bidirectional Gb/s data communications. With high-bit rate and range sufficient for important information infrastructures, such as smart cities and 10 Gbit Ethernet, QKD is a significant step closer towards wide-scale deployment in fiber networks.

Item Type: Article
Uncontrolled Keywords: quant-ph quant-ph
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:22
Last Modified: 20 Oct 2014 01:10
DOI: 10.1103/PhysRevX.2.041010