Strong coupling between electron floating above superfluid helium and a single microwave photon trapped inside a superconducting cavity

https://phys.org/news/2026-07-theorized-electron-helium-qubit-strong.html

"combines micro-scale quantum dot/ high-impedance superconducting coplanar microwave resonator, embedded in microfluidic architecture... shields qubit against localized decoherence-causing impurities/ defects...g/ 2π = 118 MHz electron-resonator interaction rate outpacing electron motional state decoherence/ raw photon losses inside cavity... scalable, low-noise hybrid quantum computing with high-fidelity spin readouts... cleanly interfaces with existing superconducting processors"