Cavity-based single atom preparation and high-fidelity hyperfine state readout.
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.
Gehr
Roger
R
Laboratoire Kastler-Brossel, ENS, CNRS, UPMC, 24 rue Lhomond, 75005 Paris, France.
Volz
Jürgen
J
Dubois
Guilhem
G
Steinmetz
Tilo
T
Colombe
Yves
Y
Lev
Benjamin L
BL
Long
Romain
R
Estève
Jérôme
J
Reichel
Jakob
J