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Quantum key distribution using deterministic single-photon sources over a field-installed fibre link.
- Source :
- NPJ Quantum Information; 1/2/2024, Vol. 10 Issue 1, p1-6, 6p
- Publication Year :
- 2024
-
Abstract
- Quantum-dot-based single-photon sources are key assets for quantum information technology, supplying on-demand scalable quantum resources for computing and communication. However, long-lasting issues such as limited long-term stability and source brightness have traditionally impeded their adoption in real-world applications. Here, we realize a quantum key distribution field trial using true single photons across an 18-km-long dark fibre, located in the Copenhagen metropolitan area, using an optimized, state-of-the-art, quantum-dot single-photon source frequency-converted to the telecom wavelength. A secret key generation rate of > 2 kbits/s realized over a 9.6 dB channel loss is achieved with a polarization-encoded BB84 scheme, showing remarkable stability for more than 24 hours of continuous operation. Our results highlight the maturity of deterministic single-photon source technology while paving the way for advanced single-photon-based communication protocols, including fully device-independent quantum key distribution, towards the goal of a quantum internet. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20566387
- Volume :
- 10
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- NPJ Quantum Information
- Publication Type :
- Academic Journal
- Accession number :
- 174580746
- Full Text :
- https://doi.org/10.1038/s41534-023-00800-x