Quantum sensors rely on very precise control of doping conditions. Also these kinds of alloys are used in photonics computing, which is used to interact with qubits. Sounds like that’s what they’re talking about here.
In the sense in that literally everything in the world is quantum, sure. But no, I mean sensors which derive their input channel from explicitly quantum effects. Gravometers, magnometers, atomic clocks, etc. are often quantum sensors.
possibly you meant 'gravimeters'; a gravometer is evidently a 19th-century density measurement instrument. plenty of gravimeters are as purely classical as anything electrical is, and those that prominently feature quantum effects are superconducting gravimeters. i don't see how a gaas fab is relevant to either mems gravimeters or superconducting gravimeters!
similarly 'magnometers' are not a thing, and magnetometers are generally either superconducting or pretty classical, so i am getting the feeling you are just trolling me to see if you can get a reaction by posting stuff without any consideration for whether it is true or not
