An international research team has now discovered a surprising effect in a system that is particularly well suited for processing quantum information: the spins of phosphorus atoms in a piece of silicon, coupled to a microwave resonator.
If these spins are expertly stimulated with microwave pulses, a so-called spin echo signal can be detected after a certain time – the injected pulse signal is re-emitted as a quantum echo.
Amazingly, this quantum echo doesn’t occur only once, but a whole series of echoes can be detected. This opens up new possibilities of how information can be processed with quantum systems.
Source: “The Return of the Spin Echo”, Technical University Munich