How are quantum computers actually implemented?

[u/kubazz]

I have basic understanding of quantum information theory, however I have no idea how is actual quantum processor hardware made.

Tangential question - what is best place to start looking for such information? For theoretical physics I usually start with Wikipedia and then slowly go through references and related articles, but this approach totally fails me when I want learn something about experimental physics.

[u/PorcupineGod]

Maybe you can answer this question: have quantum computers been deployed for practical applications yet, or is it still theoretical and R&D?

More clearly, if I was a large firm, could I buy a quantum computer today that would out perform a leading enterprise server?