SESSION 6: AMO physics

Chair: (Grant Biedermann)
8:30am - 9:15amManuel Endres, California Institute of Technology (invited)
Quantum simulation with alkali and alkaline-earth Rydberg-arrays
Abstract. Recently, cold alkali atoms in optical tweezer arrays have emerged as a versatile platform for quantum simulation. I will review these developments and give an update about ongoing experiments with alkaline-earth atoms: 1) I will introduce atom-by-atom assembly as a fast and simple method to generate defect-free atomic arrays. 2) I will review how such arrays can be used as a quantum simulator for specific types of transverse- & longitudinal-field Ising-models with 1/R^6 interaction. 3) I will outline how we are currently extending this work to alkaline-earth atoms using Strontium-88; particularly, I will illustrate how this new direction could overcome current coherence limits and enable scalability to larger tweezer arrays.
9:15am - 9:45amAlex Burgers, California Institute of Technology
Engineering atom-light interactions in photonic crystal waveguides
Abstract. Integrating cold atoms with nanophotonics enables the exploration of new paradigms in quantum optics and many body physics. Advanced fabrication capabilities for low-loss dielectric materials provide powerful tools to engineer band structure and light-matter couplings between photons and atoms. The current system at Caltech to explore such phenomena consists of a quasi-one-dimensional photonic crystal waveguide (PCW) whose band structure arises from periodic modulation of the dielectric structure. The waveguide design gives rise to stable trap sites for atoms at each unit cell of the crystal (150 sites for the 1D waveguide). Atoms localized in these traps will interact with one another via guided modes of the waveguide creating a versatile system that can be utilized for both quantum memories and quantum simulation. We have performed extensive trajectory simulations of atoms delivered by an optical lattice to the PCWs. The good correspondence between simulation and data enables us to understand the microscopic dynamics of atoms near the waveguide and introduce auxiliary GMs that perturb the atoms and reveal how they can be delivered to these GM trap regions. I will present recent efforts to achieve high fractional filling of trap sites within the PCW using the optical lattice delivery system and discuss future research goals.
9:45am - 10:15amMurray Holland, University of Colorado JILA
New frontiers in laser cooling of neutral atoms and trapped ions
Abstract. 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)

SQuInT Chief Organizer
Akimasa Miyake, Associate Professor

SQuInT Local Organizers
Rafael Alexander, Postdoctoral Fellow
Chris Jackson, Postdoctoral Fellow

SQuInT Administrator
Gloria Cordova
505 277-1850

SQuInT Assistant
Wendy Jay

SQuInT Founder
Ivan Deutsch, Regents' Professor, CQuIC Director

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