Quantum information has seen a vast progress in the recent years. All the different physical implementations feauture their advantages, but also disadvantages. The goal of this project is to combine the advantages of different physical systems to bridge their weaknesses. For example solid-state physics implementations allow very fast control with electrical signals and promise dense integration, but have short coherence times. Atomic systems are slow, but exhibit very long coherence of quantumbits if they are stored in hyperfine states, further the ‘clock’ states are specially unsensitive to decoherence. An ensemble of ultracold atoms would thus be an ideal quantum memory. For that it will be necessary to ‘quantum interconnect’ the solid-state devices with the atomic ensemble in a deterministic and controllabe way, such that the quantum nature of the transferred information is preserved.
Coupling atoms to a CPW resonator on a chip