A low-noise single-photon detector for long-distance free-space quantum communication Elena Anisimova, Dmitri Nikulov, Simeng Simone Hu, Mark Bourgon, Sebastian Philipp Neumann, Rupert Ursin, Thomas Jennewein and Vadim Makarov EPJ Quantum Technol., 8 1 (2021) 23 Published online: 26 October 2021 DOI: 10.1140/epjqt/s40507-021-00111-0