The US Army has developed a quantum sensor that can detect communication signals over the entire radio frequency spectrum, from 0 to 100 GHz, using a single antenna. That is currently impossible with a traditional receiver system, and would require multiple systems of individual antennas, amplifiers and other components.
In 2018, Army scientists were the first in the world to create a quantum receiver that uses highly excited, super-sensitive atoms--known as Rydberg atoms--to detect communications signals. The researchers calculated the receiver's channel capacity, or rate of data transmission, based on fundamental principles, and then achieved that performance experimentally in their lab--improving on other groups' results by orders of magnitude.