Quantum key distribution with entangled photons generated on-demand by a quantum dot

• URL: http://arxiv.org/abs/2007.12727v1
• Date: Fri, 24 Jul 2020 18:21:19 GMT
• Title: Quantum key distribution with entangled photons generated on-demand by a quantum dot
• Authors: Francesco Basso Basset, Mauro Valeri, Emanuele Roccia, Valerio Muredda, Davide Poderini, Julia Neuwirth, Nicol\`o Spagnolo, Michele B. Rota, Gonzalo Carvacho, Fabio Sciarrino, Rinaldo Trotta
• Abstract summary: Entanglement-based protocols offer additional layers of security and scale favorably with quantum repeaters. We experimentally demonstrate a modified Ekert quantum key distribution protocol with two quantum channel approaches. Our field study highlights that quantum-dot entangled-photon sources are ready to go beyond laboratory experiments.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution---exchanging a random secret key relying on a quantum mechanical resource---is the core feature of secure quantum networks. Entanglement-based protocols offer additional layers of security and scale favorably with quantum repeaters, but the stringent requirements set on the photon source have made their use situational so far. Semiconductor-based quantum emitters are a promising solution in this scenario, ensuring on-demand generation of near-unity-fidelity entangled photons with record-low multi-photon emission, the latter feature countering some of the best eavesdropping attacks. Here we first employ a quantum dot to experimentally demonstrate a modified Ekert quantum key distribution protocol with two quantum channel approaches: both a 250 meter long single mode fiber and in free-space, connecting two buildings within the campus of Sapienza University in Rome. Our field study highlights that quantum-dot entangled-photon sources are ready to go beyond laboratory experiments, thus opening the way to real-life quantum communication.

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