Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.203601
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Funding
- Deutsche Forschungsgemeinschaft
- European Union
- Alexander von Humboldt Foundation
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We introduce lossless state detection of trapped neutral atoms based on cavity-enhanced fluorescence. In an experiment with a single (87)Rb atom, a hyperfine-state-detection fidelity of 99.4% is achieved in 85 mu s. The quantum bit is interrogated many hundreds of times without loss of the atom while a result is obtained in every readout attempt. The fidelity proves robust against atomic frequency shifts induced by the trapping potential. Our scheme does not require strong coupling between the atom and cavity and can be generalized to other systems with an optically accessible quantum bit.
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