Time Tagger Q400 is a PCIe ¾ length card that works within an x64 Linux computer. It provides four count inputs and a fifth input for a frame or synchronisation input. External clocks can be provided as either a 10MHz single ended or 100MHz differential signal. An additional input is provided to gate the counts. Counts are returned over the PCIe bus to the main system memory and is accessible via an API.
| Features | Time Tagger Q400 provides timing resolution to 31.25ps | |
| Applications | Photon Timing, QKD, Quantum computing, single-photon spectroscopy | |
| Specifications | Parameter | Value |
| Power | Triple | 3.3V +12 V from PCIe finger |
| Time-tagger Inputs | Voltage Type | 0.5-5V pulse |
| Resolution | 31.25ps | |
| Number | 4 Continuous timing inputs | |
| 1 Slow synchronisation or framing pulse | ||
| Clock Sources | Single-ended | 10MHz e.g. from GPS or atomic standard |
| Differential | 100MHz or custom | |
| Internal clock | 100MHz derived from 25MHz crystal | |
| Gate Input | Type | 3V3 CMOS logic |
| Connection | SMA | |
| Connectors | Timing | SMA positive pin. Max 5V 10GHz |
| PCIe | 8 lane Gen 3 finger connector | |
| Clock | SMA positive pin. 10MHz sinusoidal. Max 13dBm | |
| Pulses | 4x SMA 50 Ohm terminated | |
| Dimensions | WxHxD | 160 x 100 x 33 mm |
| Weight | 300 g | |
| Storage Temp | -20 to 85 C | |
| Operating Temp | -20 to 60 C |
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