We’re excited to share a major step forward in the Allegro project!
To enable entanglement distribution, we’ve deployed a broadband Spontaneous Parametric Down-Conversion (SPDC) source, centered at 1550.12 nm. This entangled photon source connects to our quantum Reconfigurable Optical Add-Drop Multiplexer (q-ROADM), where a DEMUX separates the spectrum into multiple 100 GHz spaced channels.
Our innovative wavelength assignment scheme supports both: 🔷 Prepare-and-measure QKD links
⚫ Entanglement-based links
These logical connections are visualized in the graph shown in Fig. 1C.
At the user end, Polarisation Analysis Modules (PAMs) are employed, performing random basis measurements in either:
- HV basis (short path) or
- DA basis (long path).
🕒 All measurements are time-stamped and correlated using a time-digital converter, ensuring precise entanglement verification and key generation.
This architecture is a foundational step towards scalable, high-rate quantum communication networks across metropolitan-scale environments. 💡🌐
#QuantumNetworking #QKD #Entanglement #Photonics #SPDC #QuantumCommunication #AllegroProject #OpticalNetworks
