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qutag_symbolThe Fastest Time-Tagger in the Solar System
State of the art time-to-digital converter

Time-correlated single photon counting with a resolution under 10 picoseconds.

The quTAG is a highspeed-TCSPC system. It is capable of detecting events with a digital resolution of 1 picosecond and a jitter under 10 ps RMS using four to 16 different channels. This allows to capture up to 100 millions time tags per second. It registers all signals between -2 up to +3 Volt, like the widely used LVTTL or NIM.

Separate channels for start and external clock are usable on the front panel. It connects with a computer via USB, preferably USB 3.0 to transfer the extensive data.

It is delivered including software for Windows and Linux with an easy to use graphical user interface. A DLLs and examples for LabVIEW and Python are included, of course.

Download Datasheet

Key Features

  •  < 25 ps / < 10 ps timing jitter (FWHM/RMS)
  • 100 MEvents/s max. rate
  • 1 ps digital resolution
  • 4 stop channels, 1 start channel
  • max. 16 stop channels


  • Time-Correlated Single Photon Counting (TCSPC)
  • Quantum Optics/Information/Communication
  • Fluorescence/Phosphorescence Lifetime Imaging
  • Fluorescence Correlation Spectroscopy (FCS)
  • Stimulated Emission Depletion Microscopy (STED)
  • Foerster Resonance Energy Transfer (FRET)
  • Single Photon Emitter Characterisation


Timing jitter< 10
< 25
ps RMS
Digital resolution1ps
Number of stop channels4
(max. 16)
Max event rate100
M/s (per device)
M/s (per channel)
Input signalse.g. LVTTL, NIM
everything between -2 V and +3 V
Input connectorsSMA
Connection to PCUSB 3.0
USB 2.0
SoftwareGUI, DLL, LabView, Python, Command line
Windows, Linux
Dimensions44 x 30 x 5cm x cm x cm

For more specifications, please refer to our datasheet.

Use cases

We used the quTAG for two experiments together with the superconducting nanowire single photon detector (SNSPD) from our long-time collaborators at Single Quantum. The results proved the efficiency and speed that we expected as we engineered the quTAG.

Measurement 1: Laser trigger as Start, Single Quantum SNSPD as Stop

We measured a time difference histogram between the trigger pulse from the laser as start and the SQ detector signal as stop.
This is basically the setup for a Fluorescence Lifetime Imaging (FLIM) measurement..

Whole system response function (blue, measured with quTAG): Timing jitter 17.8 ps RMS, 35.9 ps FWHM
For comparison: Detector response function (red, measured with fast oscilloscope): Timing jitter 14.5 ps RMS, 26.1 ps FWHM.


Measurement 2: One SQ Detector as Start, another one as Stop

Here, we measured the time difference histogram between one of the two SQ SNSPDs as Start and the other one as Stop pulse.

Timing jitter of 2 SQ SNSPDs measured with the quTAG (blue): 21.6 ps RMS, 45.6 ps FWHM.


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