Direct comparison of a Ca+ single ion clock against a Sr optical lattice clock

Abstract

Optical frequency comparison of the 40Ca+ clock transition ν_{Ca} (2S1/2-2D5/2, 729nm) against the 87Sr optical lattice clock transition ν_{Sr}(1S0-3P0, 698nm) has resulted in a frequency ratio ν_{Ca} / ν_{Sr} = 0.957 631 202 358 049 9(2 3). The rapid nature of optical comparison allowed the statistical uncertainty of frequency ratio ν_{Ca} / ν_{Sr} to reach 1x10-15 in only 1000s and yielded a value consistent with that calculated from separate absolute frequency measurements of ν_{Ca} using the International Atomic Time (TAI) link. The total uncertainty of the frequency ratio using optical comparison (free from microwave link uncertainties) is smaller than that obtained using absolute frequency measurement, demonstrating the advantage of optical frequency evaluation. We report the absolute frequency of ^{40}Ca+ with a systematic uncertainty 14 times smaller than our previous measurement [1].

References in corpus (12)

• Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
• Progress in Atomic Fountains at LNE-SYRTE
• Absolute frequency measurement of the 40Ca+ S1/2 - D5/2 clock transition
• The absolute frequency of the 87Sr optical clock transition
• The 87-Sr optical frequency standard at PTB
• Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer
• Direct Comparison of Distant Optical Lattice Clocks at the $10^{-16}$ Uncertainty
• An Optical Lattice Clock with Spin-polarized 87Sr Atoms
• All-optical link for direct comparison of distant optical clocks
• Blackbody radiation shift in a 43Ca+ ion optical frequency standard
• Hertz-level Measurement of the 40Ca+ 4s 2S1/2-3d 2D5/2 Clock Transition Frequency With Respect to the SI Second through GPS
• Stability Transfer between Two Clock Lasers Operating at Different Wavelengths for Absolute Frequency Measurement of Clock Transition in 87Sr

Cited by in corpus (24)

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• Realization of a time-scale with an accurate optical lattice clock
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• Long term measurement of the ${}^{87}$Sr clock frequency at the limit of primary Cs clocks
• Lorentz and CPT Tests with Clock-Comparison Experiments
• Direct comparison of optical lattice clocks with an intercontinental baseline of 9 000 km
• Dynamic polarizabilities for the low lying states of Ca+
• Spectroscopy and frequency measurement of the ${}^{87}$Sr clock transition by laser linewidth transfer using an optical frequency comb
• Intermittent optical frequency measurements to reduce the dead time uncertainty of frequency link
• Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks
• Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values
• Frequency ratio of an ${}^{115}$In${}^{+}$ ion clock and a ${}^{87}$Sr optical lattice clock
• Parameter estimation in atomic spectroscopy using exceptional points
• Frequency measurement of the clock transition of an indium ion sympathetically-cooled in a linear trap
• Prospects of a Pb${}^{2+}$ ion clock
• Frequency measurement of the ${}^1{\mathrm{S}}_0,F=5/2\leftrightarrow {}^3{\mathrm{P}}_1,F=7/2$ transition of ${}^{27}$Al${}^{+}$ via quantum logic spectroscopy with ${}^{40}$Ca${}^{+}$
• Angle-dependent magic wavelengths for the $4s_{1/2}\to 3d_{5/2,3/2}$ transitions of Ca${}^{+}$ ions
• Evaluation of blackbody radiation shift with temperature associated fractional uncertainty at 10E-18 level for 40Ca+ ion optical clock
• Quadrupole transitions and quantum gates protected by continuous dynamic decoupling
• Absolute frequency measurements with a robust, transportable ^{40}Ca^{+} optical clock