Development and Characterization of Quantum Light Sources for Sensing and Communication

This project brings together complementary research groups from four institutions: Universidade Federal do ABC (UFABC) and the Universidade de Sao Paulo (USP) in Brazil, and at Humboldt-Universität zu Berlin (HUB) and Technische Universität Berlin (TUB) in Germany; The collaboration will conduct a focused investigation of quantum light sources tailored to specific atomic transitions (rubidium and cesium), as well as telecommunication wavelengths, molecular absorption lines in the infrared and peak detection responsivity wavelengths, with the goal of exploring their applicability in quantum communication networks and sensing schemes.
Over its 24-month duration, the project will focus on three primary scientific targets, aiming at the generation and characterization of quantum states of light in optical modes compatible with:
• Quantum memories based on cesium (894 nm) and rubidium (780 nm) gas cells.
• Entangled modes at telecommunication wavelengths (1530 – 1565 nm), followed by the frequency conversion of one photon to the peak responsivity range of silicon avalanche photodiodes (600 – 800 nm).
• Photon pairs combining a photon within a high-efficiency detection window (600 – 1625 nm) with a partner photon resonant with near-infrared molecular transitions (> 2000 nm).
In the discrete-variable regime, these tailored photon pairs will be compatible with both quantum networks and quantum spectroscopy with undetected photons. In the continuous-variable regime, the corresponding optical modes will be investigated for sub-shot-noise phase measurements across different spectral ranges.