Coupling 2 Andreev qubits coherently 6 millimeters via microwave photons generated in narrow superconducting resonator

https://phys.org/news/2024-10-physicists-strong-coupling-andreev-qubits.html

"qubits formed at metal/ superconductor interface (Andreev reflection)... electron from metal enters superconductor becoming part of Cooper pair... hole behaving like positive particle reflects back into metal,  basis states readily controlled/ incorporated into circuits... 2 modes: (1) qubit's quantum state read via resonator, (2) couple 2 qubits allowing them to communicate without losing microwave photons, sharing new quantum state... combined 3 quantum systems... suitable as compact/ scalable solid-state qubits"