Apropos nothing... Everyone always talking about quantum computing and quantum information as the big second-generation* quantum-tech applications. (Someday I will get into what I think about quantum computing.) But there's a whole world of quantum sensing out there that's way more successful, starting with atomic clocks, which are already an established second-gen quantum technology.
Here's a recent result in quantum sensing:
In the test, multiple quantum navigation sensors enable an aircraft to navigate without GPS.
* First-generation quantum tech is things that rely on the quantum nature of materials. The whole semi-conductor industry, and lasers, are the primary examples. Second-generation quantum tech is technology that relies on quantum control: the active building and control of quantum systems. By far the earliest example, and the most commercially advanced, is quantum clocks. But there are other types of quantum sensors on the market (mainly quantum magnetometers).
