期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.133603
关键词
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资金
- NSF
- DARPA (QUASAR)
- MURI through the ARO
- NSF Center for Ultracold Atoms
- Ministry of Education and Science of the Republic of Serbia [III45016]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0855052] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [0959057, 1205554] Funding Source: National Science Foundation
We demonstrate single-atom resolution, as well as detection sensitivity more than 20 dB below the quantum projection noise limit, for hyperfine-state-selective measurements on mesoscopic ensembles containing 100 or more atoms. The measurement detects the atom-induced shift of the resonance frequency of an optical cavity containing the ensemble. While spatially varying coupling of atoms to the cavity prevents the direct observation of a quantized signal, the demonstrated measurement resolution provides the readout capability necessary for atomic interferometry substantially below the standard quantum limit and down to the Heisenberg limit.
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