New frontiers in laser cooling of neutral atoms and trapped ions

Presenting Author: Murray Holland, University of Colorado JILA
Contributing Author(s): Athreya Shankar, John P. Bartolotta, Matthew A. Norcia, Julia R.K. Cline, James K. Thompson, Elena Jordan, Kevin Gilmore, Arghavan Safavi-Naini, Justin G. Bohnet, John J. Bollinger

We theoretically analyze the novel physics in two recent demonstrations of laser cooling [1,2]. First, we describe laser cooling by Sawtooth Wave Adiabatic Passage (SWAP) of neutral atoms in free space that possess narrow linewidth transitions [3]. SWAP cooling exploits the extreme coherence on offer using near-resonant laser fields whose frequencies are time dependent. With a reduced reliance on spontaneous emission compared to Doppler cooling, SWAP cooling shows promise for cooling systems lacking closed cycling transitions, such as molecules. Second, we numerically investigate the efficiency of near ground-state cooling of large 2D ion crystals in Penning traps using electromagnetically induced transparency (EIT) [4]. We show that, in spite of the challenges posed by these rotating multi-ion crystals, the large bandwidth of drumhead modes (hundreds of kilohertz) can be rapidly cooled to near ground-state occupations. We predict a surprising enhancement of the cooling rate of the center-of-mass mode with increasing number of ions. We will highlight relevant experimental results in support of our theories. [1] M. Norcia et al. New J. Phys. 20 (2018) [2] E. Jordan et al. arXiv:1809.06346 (Sep. 2018) [3] J.P. Bartolotta et al. Phys. Rev. A 98 (2018) [4] A. Shankar et al. arXiv:1809.05492 (2018)

Read this article online: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.98.023404, https://arxiv.org/abs/1809.05492

(Session 6 : Monday from 9:45am - 10:15am)


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