Now, researchers at the Karlsruhe Institute of Technology in Germany have embedded 20 aluminium qubits inside a microwave resonator, creating a very small piece of quantum metamaterial (pictured below). Basically, when microwaves of a certain frequency hit the quantum metamaterial, the photons (which make up the microwaves) bounce around inside the resonator and interact with the 20 qubits,
and then eventually leave resonator in a different phase. By measuring the phase change, the researchers came to an interesting conclusion: Up to eight of the qubits were coupling together to affect the photons, and then over time these groups of eight would disassociate into groups of four. We’re not sure why this is, and finding out the answer is prime target for future research.