Which quantum hardware platforms are the best for doing fundamental quantum physics research?

I’m trying to understand which experimental platforms are most suitable for fundamental quantum research, things like testing quantum foundations, or probing the limits of quantum mechanics, not necessarly for developing quantum computers. Which hardware platforms (ions, neutral atoms, photonics, superconducting circuits, etc.) are actually used for these kinds of discoveries, and why? If you can give some examples of previous discoveries made using a specific platform I would appreciate it. submitted by /u/Mysteriyum [link] [comments]