Raman sideband cooling of ²⁵Mg⁺ -²⁷Al⁺ ions pair and observation of quantum logic spectra

2019/02/26 by Liu, Hong-Li, Xu, Ze-Tian, Ma, Zhi-Yu +8
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.1902.09716

Abstract

We perform quantum logic spectroscopy (QLS) on ²⁷Al⁺ ion ¹S₀ - ³P₁ transition, which is an important step toward the QLS based ²⁷Al⁺ ion optical clock. As a precondition of QLS, both the stretch (STR) mode and the common (COM) mode of the ²⁷Al⁺ and ²⁵Mg⁺ ions pair are cooled to the vibrational ground state by Raman sideband cooling. The mean phonon number is measured to be 0.10(1) for the STR mode and 0.01(1) for the COM mode, respectively. The heating rate is evaluated to be 13(3) phonons/s for the STR mode and 5.5(1) phonons/s for the COM mode.

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