IQIM Postdoctoral and Graduate Student Seminar
Alkaline earth atoms in optical tweezers
Abstract: Neutral atoms in optical tweezers provide a versatile experimental platform for assembling quantum many-body systems in multidimensional arrays with single-particle control, tunable interactions, and variable geometries. Alkaline earth atoms offer narrow and ultra-narrow optical transitions suitable for exploring narrow-line cooling mechanisms and exploiting optical clock transitions as long-lived optical qubits.
In this seminar, I will present our recent experimental results demonstrating the trapping, cooling, and imaging of single strontium atoms in two-dimensional arrays of optical tweezers [1, 2]. First, I will introduce a novel narrow-line cooling mechanism that allows for compensating for heating during fluorescence imaging over a wide range of parameters. Then, I will explain how tuning the wavelength and polarization of the trapping light enables achieving a magic trapping condition suitable for implementing resolved sideband cooling of single atoms close to their motional ground state. Finally, I will describe our approach to perform repetitive non-destructive imaging of single atoms with a fidelity of 99.991(1)% for more than a thousand times. These results pave the way for novel experiments in precision metrology using the ultra-narrow optical clock transition and quantum simulation using strong direct excitation to Rydberg states.
 A. Cooper, J. P. Covey, I. S. Madjarov, S. G. Porsev, M. S. Safronova, M. Endres.
"Alkaline earth atoms in optical tweezers.", arXiv:1810.06537 (in press at PRX, 2018).
 J. P. Covey, I. S. Madjarov, A. Cooper, M. Endres.
"2000-times repeated imaging of strontium atoms in clock-magic tweezer arrays.", arXiv:1810.06014 (2018).
Contact: Marcia Brown at 626-395-4013 firstname.lastname@example.org