KavitätenQED

KavitätenQED, also known as cavity quantum electrodynamics, is the study of the interaction between light and matter confined within a resonant optical cavity. This field examines how the quantized electromagnetic field of a cavity mode couples to atomic or quantum emitter systems such as atoms, ions, quantum dots, or superconducting qubits. By manipulating the cavity length, material, and geometry, researchers can control the rate of spontaneous emission, leading to phenomena such as the Purcell effect, where emission is enhanced or suppressed, and strong coupling, where the emitter and cavity exchange energy coherently.

Key experimental realizations include high-finesse optical cavities with neutral atoms or trapped ions and superconducting microwave resonators coupled to superconducting qubits. Theoretical treatments rely on the Jaynes–Cummings model and its extensions, which describe the combined light–matter system as a set of quantized modes interacting with discrete energy levels.

Applications of KavitätenQED span quantum information processing, where cavity–emitter interfaces enable deterministic photon‑qubit interactions, to fundamental tests of quantum optics such as observation of quantum jumps and entanglement generation. In solid‑state implementations, cavity QED facilitates single‑photon sources and quantum repeaters. The field continues to evolve with developments in hybrid platforms, tunable cavities, and integration with photonic circuits, promising scalable quantum technologies.