Continuous Raman sideband cooling beyond the Lamb-Dicke Regime in a trapped ion chain

• URL: http://arxiv.org/abs/2208.07394v1
• Date: Mon, 15 Aug 2022 18:23:40 GMT
• Title: Continuous Raman sideband cooling beyond the Lamb-Dicke Regime in a trapped ion chain
• Authors: Qiming Wu, Yue Shi, and Jiehang Zhang
• Abstract summary: We report continuous Raman sideband cooling (CRSC) of a long ion chain to the motional ground state beyond the Lamb-Dicke regime. Compared to traditional ground-state cooling methods such as pulsed sideband cooling or electromagnetic-induced-transparency (EIT) cooling, our method offers two key advantages: robustness to timing errors and an ultra-wide bandwidth unlimited by the number of ions.
• Score: 1.6249267147413524
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report continuous Raman sideband cooling (CRSC) of a long ion chain to the motional ground state beyond the Lamb-Dicke (LD) regime. By driving multiple sideband transitions simultaneously, we show that nearly all axial modes of a 24-ion chain are cooled to the ground state, with an LD parameter as large as $\eta = 1.3$, spanning a frequency bandwidth of 4 MHz. Compared to traditional ground-state cooling methods such as pulsed sideband cooling or electromagnetic-induced-transparency (EIT) cooling, our method offers two key advantages: robustness to timing errors; and an ultra-wide bandwidth unlimited by the number of ions. This technique contributes as a crucial step for large-scale quantum information processing with linear ion chains and higher dimensions alike, and can be readily generalized to other atomic and molecular systems.

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