Summary:

Scientists from the Raman Research Institute (RRI) have selected the Indian Astronomical Observatory (IAO) in Hanle, Ladakh, as India's best location for satellite-based quantum communications. The study examined meteorological data from Hanle, Mt. Abu (Rajasthan), and ARIES, Nainital (Uttarakhand), emphasizing Hanle's cold desert environment, low atmospheric water vapor, and oxygen levels. These characteristics make it ideal for quantum key distribution (QKD) with minimal atmospheric distortion, enabling long-distance quantum signal transmission.

The study focused on transmitting quantum signals across Earth's atmosphere using beacon signals, telescope operations, and signal divergence control. For the primary signal, researchers used 370 THz (810 nm) wavelengths, which were magnified and detected using smaller telescopes. Hanle experienced the least signal loss (44dB), followed by Mt. Abu (47dB) and Nainital (48dB). These findings provide a universal framework for site selection and link-budget estimation, which is crucial for future quantum satellite programs aiming to secure communications via LEO satellites.

Source: IBEF 

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