Abstract:

Rydberg atoms enable both coherent quantum control and nonlinear photonic interactions, forming a versatile platform for quantum technologies.

I present two complementary implementations:

(1) microwave-dressed trapping potentials on an atom chip enable stable confinement of Rydberg qubits and long-range SWAP gates via a planar microwave resonator

(2) in a separate setup, continuous-wave quantum transistor devices based on Rydberg ensembles exploit single-photon-induced breakdown of electromagnetically induced transparency to modulate a probe field.

These results demonstrate how engineered Rydberg interactions support both gate-based quantum processing and continuous, single-photon-level photonic control.