Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/101093
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Type: Journal article
Title: Quantum projection noise in an atomic fountain: a high stability cesium frequency standard
Author: Santarelli, G.
Laurent, P.
Lemonde, P.
Clairon, A.
Mann, A.
Chang, S.
Luiten, A.
Salomon, C.
Citation: Physical Review Letters, 1999; 82(23):4619-4622
Publisher: American Physical Society
Issue Date: 1999
ISSN: 0031-9007
1079-7114
Statement of
Responsibility: 
G. Santarelli, Ph. Laurent, P. Lemonde, and A. Clairon, A. G. Mann, S. Chang, and A. N. Luiten, C. Salomon
Abstract: We describe the operation of a laser cooled cesium fountain clock in the quantum limited regime. An ultrastable cryogenic sapphire oscillator is used to measure the short-term frequency stability of the fountain as a function of the number of detected atoms Nat. For Nat varying from 4 × 104 to 6 × 105 the Allan standard deviation of the frequency fluctuations is in excellent agreement with the Nat-1/2 law of atomic projection noise. With 6 × 105 atoms, the relative frequency stability is 4 × 10-14τ-1/2where Τ is the integration time in seconds. This is the best short-term stability ever reported for primary frequency standards, a factor of 5 improvement over previous results. © 1999 The American Physical Society.
Rights: © 1999 The American Physical Society
DOI: 10.1103/PhysRevLett.82.4619
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