Quantum key distribution using deterministic single-photon sources over a field-installed fibre link

Author:

Zahidy MujtabaORCID,Mikkelsen Mikkel T.,Müller Ronny,Da Lio Beatrice,Krehbiel Martin,Wang Ying,Bart Nikolai,Wieck Andreas D.ORCID,Ludwig Arne,Galili Michael,Forchhammer SørenORCID,Lodahl Peter,Oxenløwe Leif K.ORCID,Bacco Davide,Midolo LeonardoORCID

Abstract

AbstractQuantum-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.

Publisher

Springer Science and Business Media LLC

Subject

Computational Theory and Mathematics,Computer Networks and Communications,Statistical and Nonlinear Physics,Computer Science (miscellaneous)

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