Related papers: Quantum Key Distribution using Deterministic Single-Photon Sources over a Field-Installed Fibre Link

Quantum Key Distribution using Deterministic Single-Photon Sources over a Field-Installed Fibre Link

URL: http://arxiv.org/abs/2301.09399v2
Date: Wed, 12 Apr 2023 09:25:20 GMT
Title: Quantum Key Distribution using Deterministic Single-Photon Sources over a Field-Installed Fibre Link
Authors: Mujtaba Zahidy, Mikkel T. Mikkelsen, Ronny M\"uller, Beatrice Da Lio, Martin Krehbiel, Ying Wang, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Michael Galili, S{\o}ren Forchhammer, Peter Lodahl, Leif K. Oxenl{\o}we, Davide Bacco, and Leonardo Midolo
Abstract summary: 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. 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.
Score: 2.1033685912119466
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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, longlasting 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.

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