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Conference on Lasers and Electro-Optics

1 GBaud Heterodyne Continuous Variable Quantum Key Distribution over 26 km Fiber

Max Rückmann, Christian Schaeffer

Published May 5, 2019• 2 citations
Publisher

Abstract

We experimentally demonstrate a 1 GBaud heterodyne continuous variable quantum key distribution system based on standard telecom components capable to achieve a key rate of 1.71 Mbit/s over 26 km of fiber. © 2019 The Author(s)
DOI
10.23919/cleo.2019.8749355

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Quantum key distribution provides secure keys resistant to code-breaking quantum computers. The continuous-variable version of quantum key distribution offers the advantages of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. However, the transmission distance of these systems (compared with discrete-variable systems) are currently limited and considered unsuitable for long-distance distribution. Herein, we report the experimental results of long distance continuous-variable quantum key distribution over 202.81 km of ultralow-loss optical fiber by suitably controlling the excess noise and employing highly efficient reconciliation procedures. This record-breaking implementation of the continuous-variable quantum key distribution doubles the previous distance record and shows the road for long-distance and large-scale secure quantum key distribution using room-temperature standard telecom components.
Continuous-variable quantum key distribution (CVQKD) [1] is a promising alternative to commonly used discrete-variable QKD protocols, because this technology can be implemented with standard telecom components and recent results suggest that it will be compatible with standard wavelength division multiplexed telecommunication networks [2]. Security proofs against general eavesdropping attacks are available for CVQKD protocols using Gaussian modulation [3], and field implementations over deployed telecommunication networks have been demonstrated over the past few years [4].