Efficient Ground-State Cooling of Large Trapped-Ion Chains with an Electromagnetically-Induced-Transparency Tripod Scheme.,Physical Review Letters

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Efficient Ground-State Cooling of Large Trapped-Ion Chains with an Electromagnetically-Induced-Transparency Tripod Scheme.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-29 , DOI: 10.1103/physrevlett.125.053001
L Feng ₁ , W L Tan ₁ , A De ₁ , A Menon ₁ , A Chu ₁ , G Pagano _{1,

2} , C Monroe ₁

Affiliation

We report the electromagnetically-induced-transparency (EIT) cooling of a large trapped

{}^{171}{Yb}^{+}

ion chain to the quantum ground state. Unlike conventional EIT cooling, we engage a four-level tripod structure and achieve fast sub-Doppler cooling over all motional modes. We observe simultaneous ground-state cooling across the complete transverse mode spectrum of up to 40 ions, occupying a bandwidth of over 3 MHz. The cooling time is observed to be less than

300 μ s

, independent of the number of ions. Such efficient cooling across the entire spectrum is essential for high-fidelity quantum operations using trapped ion crystals for quantum simulators or quantum computers.

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