Phys.org  August 5, 2024 A promising and scalable route to enable quantum networking is encoding quantum information into the frequency of photons. While the cointegration of frequency-entangled photons with coherent information transmission is achieved via spectral multiplexing, more resource-efficient approaches are required. Researchers in Germany introduced and experimentally demonstrated a transceiver concept that enabled the transmission of coherent and frequency-entangled photons over a single-frequency channel. They leveraged the serrodyne technique via electro-optic phase modulation leading to very different dynamics for entangled and coherent photons. This enabled temporal multiplexing of the respective signals. They demonstrated the preservation of entanglement over the […]