Multi-mode double-bright EIT cooling

TL;DR

The paper introduces a multi-mode EIT cooling method that uses double-bright states to efficiently cool all motional modes of a trapped ion in a single pulse, enhancing scalability and control.

Contribution

It presents a novel double-bright EIT cooling scheme involving additional states for improved multi-mode ground state cooling.

Findings

Successfully cooled all three motional modes of a trapped calcium ion.

Demonstrated single-pulse ground state cooling using the D-EIT scheme.

Scalable approach adaptable to more bright states with additional laser couplings.

Abstract

We developed a multi-mode ground state cooling technique based on electromagnetically-induced transparency (EIT). By involving an additional ground and excited state, two individually adjustable bright states together with a dark state are created. While the dark state suppresses carrier scattering, the two bright states are brought into resonance with spectrally separated motional red sidebands. With this double-bright EIT (D-EIT) cooling scheme, we experimentally demonstrate ground state cooling of all three motional modes of a trapped $^{40}$Ca$^+$ with a single cooling pulse. The approach is scalable to more than two bright states by introducing laser couplings to additional states.