Strong coupling of a microwave photon to an electron on helium

Article excerpt

Nature Physics, Published online: 15 June 2026; doi:10.1038/s41567-026-03342-z Individual electrons on superfluid helium can be used as qubits. Strong coupling between the motional state of a single superfluid helium-bound electron and a single cavity photon has now been demonstrated, enabling qubit readout schemes.