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 channel in the presence of coherent light. Their approach revealed a strong potential for efficient bandwidth use in hybrid networks… read more. Open Access TECHNICAL ARTICLEÂ
… researchers can change the color of a laser pulse with a high-speed electrical signal so that it matches the color of the entangled photon. Credit: Institute of Photonics.