Sympathetic cooling of ${}^{40}{\text{Ca}}^{+}$ - ${}^{27}{\text{Al}}^{+}$ ion pair crystal in a linear Paul trap

Abstract

The ${}^{27}$Al${}^{+}$ ion optical clock is one of the most attractive optical clocks due to its own advantages, such as low blackbody radiation shift at room temperature and insensitive to the magnetic drift. However, it cannot be laser-cooled directly in the absence of 167 nm laser to date. This problem can be solved by sympathetic cooling. In this work, a linear Paul trap is used to trap both ${}^{40}$Ca${}^{+}$ and ${}^{27}$Al${}^{+}$ ions simultaneously, and a single Doppler-cooled ${}^{40}$Ca${}^{+}$ ion is employed to sympathetically cool a single ${}^{27}$Al${}^{+}$ ion. Thus a "bright-dark" two-ion crystal has been successfully synthesized. The temperature of the crystal has been estimated to be about 7 mK by measuring the ratio of carrier and sideband spectral intensities. Finally, the dark ion is proved to be an ${}^{27}$Al${}^{+}$ ion by precise measuring of the ion crystal`s secular motion frequency, which means that it is a great step for our ${}^{27}$Al${}^{+}$ quantum logic clock.

arXiv commentPublished in Chinese Physics Letters

References in corpus (12)

• Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
• An atomic clock with $10^{-18}$ instability
• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• Single-Ion Atomic Clock with $3\times 10^{-18}$ Systematic Uncertainty
• Quantum dynamics of cold trapped ions, with application to quantum computation
• Frequency ratio of two optical clock transitions in ${}^{171}$Yb${}^{+}$ and constraints on the time-variation of fundamental constants
• Observation of the 1S0 - 3P0 clock transition in 27Al+
• Sympathetic Cooling of Mixed Species Two-Ion Crystals for Precision Spectroscopy
• Low temperature dynamics and laser-cooling of two-species Coulomb chains for quantum logic
• Hertz-level Measurement of the 40Ca+ 4s 2S1/2-3d 2D5/2 Clock Transition Frequency With Respect to the SI Second through GPS
• Sympathetic cooling and detection of a hot trapped ion by a cold one
• Observation of vibrational overtones by single molecule resonant photodissociation

Cited by in corpus (2)

• Evaluation of the systematic shifts of a ${}^{40}{\text{Ca}}^{+}-{}^{27}{\text{Al}}^{+}$ optical clock
• Sub-kelvin temperature management in ion traps for optical clocks