PicoQuant - It's about time


Coincidence Correlation and Counting

A key method for single photon based quantum technologies


Photon coincidence detection, coincidence correlation and coincidence counting are fundamental methods in optical quantum technologies. Typical examples are Hanbury-Brown-Twiss setups to study single photon sources, quantum communication and quantum key distribution (QKD), the study of entanglement using Hong-Ou Mandel (HOM) setups,
Bell state measurements, or experiments on quantum gates towards the development of quantum computers.
Time-tagging devices from PicoQuant are ideal for such applications, as they record absolute signal arrival times on several detection channels in parallel.

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General scheme

Coincidence counting
Coincidence correlation

Typical set-ups and results


Time tagger & software

Quantum Symposium

Attend our International Symposium on "Single Photon based Quantum Technologies" from May 30-June 1, 2018 in Berlin, Germany with or without a talk or poster. To encourage young scientists, we will award a prize for the “Best Student Talk”.

  • Single-photon detectors
  • Single-photon sources
  • Quantum metrology
  • Quantum correlations and entanglement
  • Quantum information processing
  • Quantum communication and QKD
  • Quantum sensing
  • Integrated photonic quantum circuits
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It's about time.