Towards an unhackable quantum internet

Eurekalert  March 23, 2020
To send quantum signals across large distances without loss a team of researchers in the US (Harvard University, MIT) found a way to correct for signal loss with a prototype quantum node that can catch, store and entangle bits of quantum information by integrating an individual color-center into a nanofabricated diamond cavity, which confines the information-bearing photons and forces them to interact with the single color-center. They
placed the device in a dilution refrigerator, which reaches temperatures close to absolute zero, and sent individual photons through fiber optic cables into the refrigerator, where they were efficiently caught and trapped by the color-center. The device can store the quantum information for milliseconds — long enough for information to be transported over thousands of kilometers. Electrodes embedded around the cavity were used to deliver control signals to process and preserve the information stored in the memory. The device combines a long memory, the ability to efficiently catch information off photons, and a way to process it locally…read more. TECHNICAL ARTICLE