High-rate intercity quantum key distribution with a semiconductor single-photon source

Jingzhong Yang; Zenghui Jiang; Frederik Benthin; Joscha Hanel; Tom Fandrich; Raphael Joos; Stephanie Bauer; Sascha Kolatschek; Ali Hreibi; Eddy Patrick Rugeramigabo; Michael Jetter; Simone Luca Portalupi; Michael Zopf; Peter Michler; Stefan Kück; Fei Ding

doi:10.1038/s41377-024-01488-0

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High-rate intercity quantum key distribution with a semiconductor single-photon source

Original Articles

- High-rate intercity quantum key distribution with a semiconductor single-photon source
- Light: Science & Applications Vol. 13, Issue 10, Pages: 2114-2123(2024)
- Affiliations：
  
  1.Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
  2.Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Stuttgart, Germany
  3.Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
  4.Laboratorium für Nano- und Quantenengineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
- Author bio：
  
  Fei Ding (fei.ding@fkp.uni-hannover.de)
- Funds：
- DOI：10.1038/s41377-024-01488-0
  CLC：
- Received：11 April 2024，
  
  Accepted：2024-05-16，
  
  Published Online：02 July 2024，
  
  Published：31 October 2024
- Accepted：
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Yang, J. Z. et al. High-rate intercity quantum key distribution with a semiconductor single-photon source. Light: Science & Applications, 13, 2114-2123 (2024).
DOI：

Yang, J. Z. et al. High-rate intercity quantum key distribution with a semiconductor single-photon source. Light: Science & Applications, 13, 2114-2123 (2024). DOI： 10.1038/s41377-024-01488-0.

摘要

Abstract

Quantum key distribution (QKD) enables the transmission of information that is secure against general attacks by eavesdroppers. The use of on-demand quantum light sources in QKD protocols is expected to help improve security and maximum tolerable loss. Semiconductor quantum dots (QDs) are a promising building block for quantum communication applications because of the deterministic emission of single photons with high brightness and low multiphoton contribution. Here we report on the first intercity QKD experiment using a bright deterministic single photon source. A BB84 protocol based on polarisation encoding is realised using the high-rate single photons in the telecommun

ication C-band emitted from a semiconductor QD embedded in a circular Bragg grating structure. Utilising the 79 km long link with 25.49 dB loss (equivalent to 130 km for the direct-connected optical fibre) between the German cities of Hannover and Braunschweig

a record-high secret key bits per pulse of 4.8 × 10

−5

with an average quantum bit error ratio of ~ 0.65% are demonstrated. An asymptotic maximum tolerable loss of 28.11 dB is found

corresponding to a length of 144 km of standard telecommunication fibre. Deterministic semiconductor sources therefore challenge state-of-the-art QKD protocols and have the potential to excel in measurement device independent protocols and quantum repeater applications.

关键词

Keywords

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