A low-noise single-photon detector for long-distance free-space quantum communication

  title={A low-noise single-photon detector for long-distance free-space quantum communication},
  author={Elena Anisimova and Dmitri Nikulov and Simeng Simone Hu and Mark Bourgon and Sebastian Philipp Neumann and Rupert Ursin and Thomas Jennewein and Vadim Makarov},
  journal={EPJ Quantum Technology},
We build and test a single-photon detector based on a Si avalanche photodiode Excelitas 30902SH thermoelectrically cooled to −100 ∘ C. Our detector has dark count rate below 1 Hz, 500 μ m $500\ \mu\mathrm{m}$ diameter photosensitive area, photon detection efficiency around 50%, afterpulsing less than 0.35%, and timing jitter under 1 ns. These characteristics make it suitable for long-distance free-space quantum communication links, which we briefly discuss. We also report an improved method… 

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