Cavity-Based Single Atom preparation and High-Fidelity Hyperfine State Readout

Printer-friendly versionSend by emailPDF version

R. Gehr, J. Volz, G. Dubois, T. Steinmetz, Y. Colombe, B.L. lev, R. Long, J. Estève, J. Reichel


Phys. Rev. Lett. 104, 203602 (2010)

We prepare and detect the hyperfine state of a single 87Rb atom coupled to a fiber-based high-finesse cavity on an atom chip. The atom is extracted from a Bose-Einstein condensate and trapped at the maximum of the cavity field, resulting in a reproducibly strong atom-cavity coupling. We use the cavity reflection and transmission signal to infer the atomic hyperfine state with a fidelity exceeding 99.92% in a readout time of 100  μs. The atom is still trapped after detection.