Quantum Key Distribution

The Photonic-Networks department works on the high-speed distribution of a cryptographic key by means of quantum communication. Both fiber and free-space (typ. satellite) transmissions are considered. We developped a system based on the time/frequency uncertainty where information is coded in either the arrival time or the frequency of photons around 1550 nm. Targeted design features are integration of telecom components and system duality for both classical and quantum communications.

Quantum Key Distribution System for High-Security Data Protection

Future-Proof Protection Against Quantum Computer Threats

Fraunhofer HHI's Quantum Key Distribution (QKD) system provides long-term secure protection for sensitive data and communication applications. The powerful system seamlessly integrates into modern telecommunications infrastructures and uses both fiber optic and free-space transmissions to distribute cryptographic keys quickly and securely.

Time to digital converter with sub nanosecond resolution

A versatile measurement device for digitizing events in time domain with a resolution down to 0.1 nanoseconds.

Fraunhofer HHI’s Timetagger is a versatile measurement device with multiple input channels allowing digitizing the time of events with a resolution of 100 ps. Switching threshold and hysteresis could be set for any input channel. The digitized events could be read by a network interface.

Precise Single Photon Detection for Quantum Applications

Compact Detector Module with High Sensitivity and Flexible Integration

The Single Photon Detection Module provides highly accurate single photon detection in the optical C and O bands. It offers exceptional sensitivity, low dark count rates, and can be flexibly integrated as a single or multi-detector module in quantum communication and computing systems.

Quantum Key Distribution