Thz switching semiconductors and spintronic devices have been in research labs for many years if you don't wait around for sensationalist articles to talk about it.
The first time I saw it was in early 2000's with Intel's Terahertz transistor, which came out to be a basis for their 22nm "TriGate".
The transistor was invented in December of 1947. By early 1953, just 5 years later, it was already being used in hearing aids that were being sold. Granted, there were continual advances over time, especially in the switch from germanium to silicon.
The thing is the transistor actually functioned in 1947 -- terahertz processors do not function now. All they have is a material that is semi-stable at -81°F. This material isn't even in a functional transistor yet. We are a long, long way from even getting this concept into a single functional chip. Let alone mass production of chips which now have a multi-year validation and production ramp up.
