Hertz-level Measurement of the 40Ca+ 4s 2S1/2-3d 2D5/2 Clock Transition Frequency With Respect to the SI Second through GPS

Abstract

We report a frequency measurement of the clock transition of a single ^40Ca^+ ion trapped and laser cooled in a miniature ring Paul trap with 10^-15 level uncertainty. In the measurement, we used an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the Global Positioning System (GPS). Two rounds of measurements were taken in May and June 2011, respectively. The frequency was measured to be 411 042 129 776 393.0(1.6) Hz with a fractional uncertainty of 3.9{\times}10^-15 in a total averaging time of > 2{\times}10^6 s within 32 days.

References in corpus (5)

• High-accuracy optical clock based on the octupole transition in 171Yb+
• Absolute frequency measurement of the 40Ca+ S1/2 - D5/2 clock transition
• The absolute frequency of the 87Sr optical clock transition
• Improved frequency measurement of a one-dimensional optical lattice clock with a spin-polarized fermionic ${}^{87}$Sr isotope
• Frequency evaluation of the doubly forbidden ${}^1{S}_0{\to }^3{P}_0$ transition in bosonic ${}^{174}$Yb

Cited by in corpus (17)

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• Measurement of magic wavelengths for the 40Ca+ clock transition
• Ramsey Spectroscopy with Displaced Frequency Jumps
• Advanced light-shift compensation protocol in a continuous-wave microcell atomic clock
• Radium Ion Optical Clock
• Reduction of light shifts in Ramsey spectroscopy with a combined error signal
• Highly-polarizable ion in a Paul trap
• Sympathetic cooling of ${}^{40}{\text{Ca}}^{+}$ - ${}^{27}{\text{Al}}^{+}$ ion pair crystal in a linear Paul trap
• Precision measurements with cold atoms and trapped ions
• Diverse Trends of Electron Correlation Effects for Properties with Different Radial and Angular Factors in an Atomic System: A case study in Ca${}^{+}$
• Relativistic coupled-cluster theory analysis of unusually large correlation effects in the determination of $g_j$ factors in Ca${}^{+}$
• Angle-dependent magic wavelengths for the $4s_{1/2}\to 3d_{5/2,3/2}$ transitions of Ca${}^{+}$ ions
• Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit