Researchers propose a new data storage device that harnesses quantum mechanics, potentially holding up to 1,000 times more data than current optical discs. The "Quantum CD" uses rare earth elements and wavelength multiplexing to densely pack photons within magnesium oxide crystals. While the concept is promising, further study is needed to determine its feasibility for practical applications.

Source: https://www.livescience.com/technology/computing/quantum-cd-could-hold-up-to-1-000-times-more-data-than-todays-optical-discs