Fully automated entanglement-based quantum cryptography system for telecom fiber networks

Abstract

We present a quantum key distribution (QKD) system based on polarisation entanglement for use in telecom fibers. A QKD exchange up to 50km was demonstrated in the laboratory with a secure key rate of 550 bit/s. The system is compact, portable with a fully automated start-up and stabilisation modules for polarisation, synchronisation and photon coupling allow a hands-off operation. Stable and reliable key exchange in a deployed optical fiber of 16km length was demonstrated. In this fiber network we achieved over two weeks an automatic key generation with an average key rate of 2000 bit/s without manual intervention. During this period, the system had an average entanglement visibility of 93%, highlighting the technical level and stability achieved for entanglement-based quantum cryptography.

20 pages, 10 figures

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Cited by in corpus (32)

• Secure Quantum Key Distribution
• Field test of quantum key distribution in the Tokyo QKD Network
• Experimental generation of single photons via active multiplexing
• A Waveguide-Coupled On-Chip Single Photon Source
• In-field entanglement distribution over a 96 km-long submarine optical fibre
• Light-matter entanglement over 50 km of optical fibre
• Feasibility of 300 km Quantum Key Distribution with Entangled States
• Experimental Single-Copy Entanglement Distillation
• Simple Quantum Key Distribution with qubit-based synchronization and a self-compensating polarization encoder
• Demonstration of active routing of entanglement in a multi-user network
• Quantum Metropolitan Optical Network based on Wavelength Division Multiplexing
• Adaptive bandwidth management for entanglement distribution in quantum networks
• Impact of Raman scattered noise from multiple telecom channels on fiber-optic quantum key distribution systems
• Photon bunching in parametric down-conversion with continuous wave excitation
• Stable Polarization Entanglement based Quantum Key Distribution over Metropolitan Fibre Network
• Polarization basis tracking scheme for quantum key distribution with revealed sifted key bits
• Three-color Sagnac source of polarization-entangled photon pairs
• Multi-user quantum key distribution with entangled photons from an AlGaAs chip
• Efficient polarisation-preserving frequency conversion from a trapped-ion-compatible wavelength to the telecom C band
• Fibre polarization state compensation in entanglement-based quantum key distribution
• Long-term transmission of entangled photons from single quantum dot over deployed fiber
• Toward A Reconfigurable Quantum Network Enabled by a Broadband Entangled Source
• Optimal pair generation rate for Entanglement-based QKD
• Distributing Polarization Entangled Photon Pairs with High Rate over Long Distance through Standard Telecommunication Fiber
• Hardware requirements for trapped-ion based verifiable blind quantum computing with a measurement-only client
• Foiling zero-error attacks against coherent-one-way quantum key distribution
• State independent QKD
• On the Security of Offloading Post-Processing for Quantum Key Distribution
• Deployed quantum link characterization via Bayesian ancilla-assisted process tomography
• Hybrid classical-quantum communication networks
• In situ quantum verification of polarization-stabilized optical channels
• Active polarization control for quantum communication in long-distance optical fibers with shared telecom traffic