3 years ago

Experimental and theoretical aspects of double-bright EIT cooling.

Ian D. Leroux, Alex Retzker, Johannes Kramer, Nils Scharnhorst, Javier Cerrillo, Piet O. Schmidt, Jannes B. Wübbena

We introduce and demonstrate double-bright electromagnetically induced transparency (D-EIT) cooling as a novel scalable approach to standard EIT cooling. By involving an additional ground state, two bright states can be shifted individually into resonance for cooling of motional modes of different frequency. This allows three-dimensional ground state cooling of a $^{40}$Ca$^+$ ion trapped in a linear Paul-trap with a single cooling pulse. Measured cooling rates and steady-state mean motional quantum numbers for this D-EIT cooling are compared with those of standard EIT cooling as well as concatenated standard EIT cooling pulses for multi-mode cooling. The failure of theoretical descriptions within the Lamb-Dicke regime to reproduce the experimental results is explained by the development of a time-dependent rate theory to simulate the cooling for both, standard EIT and D-EIT cooling. Limitations of the different cooling techniques and possible extensions to multi-ion crystals are discussed.

Publisher URL: http://arxiv.org/abs/1711.00732

DOI: arXiv:1711.00732v1

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