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Proceedings Paper

Frequency comparison of optical lattice clocks
Author(s): Masao Takamoto; Tetsushi Takano; Hidetoshi Katori
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Paper Abstract

We demonstrate the frequency comparison of two optical lattice clocks at the relative stabilities close to the quantum projection noise (QPN) limit of optical lattice clocks. This stable frequency comparison is accomplished by synchronous interrogations of two clocks by a common probe laser, which allows us to cancel out the probe laser's frequency noise. We perform the frequency comparison of a one-dimensional (1D) optical lattice clock with spin-polarized fermions 87Sr and a three-dimensional (3D) optical lattice clock with unity-occupation bosons 88Sr and achieve the Allan standard deviation of σγ(τ)=4×10-16 τ-1/2, which corresponds to the QPN limited stability for N=1,000 atoms and the spectrum linewidth γ=8 Hz. The relative stability reaches 1×10-17 with an averaging time of 1,600 s. Finally, we discuss the prospects to realize 10-18 fractional inaccuracies and the possible application of frequency comparison with synchronous interrogations to remote clocks' comparison for relativistic geodesy.

Paper Details

Date Published: 12 September 2011
PDF: 7 pages
Proc. SPIE 8132, Time and Frequency Metrology III, 81320B (12 September 2011); doi: 10.1117/12.896521
Show Author Affiliations
Masao Takamoto, The Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)
Tetsushi Takano, The Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)
Hidetoshi Katori, The Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)
RIKEN (Japan)


Published in SPIE Proceedings Vol. 8132:
Time and Frequency Metrology III
Tetsuya Ido; Thomas R. Schibli, Editor(s)

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