Bulletin of the American Physical Society
50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 64, Number 4
Monday–Friday, May 27–31, 2019; Milwaukee, Wisconsin
Session D06: Few- and many-body physics with Rydberg atoms |
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Chair: Thad Walker, University of Wisconsin-Madison Room: Wisconsin Center 102DE |
Tuesday, May 28, 2019 2:00PM - 2:30PM |
D06.00001: Quantum information with Rydberg excited atoms Invited Speaker: Mark Saffman Optically trapped neutral atoms are one of several leading approaches for scalable quantum information processing. When prepared in electronic ground states in deep optical lattices atomic qubits are weakly interacting with long coherence times. Excitation to Rydberg states turns on strong interactions which enable fast gates and entanglement generation. I will present quantum logic experiments with a 2D array of blue detuned lines that traps more than 100 Cesium atom qubits. The array is randomly loaded from a MOT and an optical tweezer steered by a 2D acousto-optic deflector is used to fill subregions of the array. Progress towards high fidelity entangling gates based on Rydberg excitation lasers with lower noise, and optimized optical polarization and magnetic field settings will be shown. [Preview Abstract] |
Tuesday, May 28, 2019 2:30PM - 3:00PM |
D06.00002: Probing Quantum Statistics and Spatial Correlations with Ultralong-Range Rydberg Molecules Invited Speaker: Thomas Killian Ultralong-range Rydberg molecules (ULRRMs) provide a sensitive and versatile probe of quantum statistics and spatial correlations in quantum gases. In ULRRMs, one or more ground-state atoms are bound to an atom in a highly excited Rydberg state through atom-electron scattering. Background atoms experience a potential that is given by the shape of the Rydberg-electron probability distribution, and the photo-excitation rate is proportional to the probability of finding atoms in the original ultracold gas with appropriate atomic configurations. In the low-density, few-body regime, ULRRMs can be created with well-defined internuclear spacing, set by the radius of the outer lobe of the Rydberg electron wavefunction. For the most-deeply bound dimer molecular state in particular, the excitation rate is proportional to the pair-correlation function, $g^{(2)}(R)$ of the initial sample, and $R$ can be scanned by varying the principal quantum number of the target Rydberg state. We demonstrate this with ultracold, non-degenerate strontium gases and pair-separation length scales from $R=1000-3000$ $a_0$, which is on the order of the thermal de Broglie wavelength for temperatures around $1\,\mu$K. Quantum statistics results in bunching for a single-component Bose gas of $^{84}$Sr and Pauli exclusion for a polarized Fermi gas of $^{87}$Sr. In the many-body regime the Rydberg atom is dressed by many background atoms, and for fermions the shape of the excitation spectrum can be explained in terms of Pauli blocking in the filled molecular orbitals of the final state. [Preview Abstract] |
Tuesday, May 28, 2019 3:00PM - 3:30PM |
D06.00003: Rydberg excitation in random and regular environments Invited Speaker: Jan M Rost A Rydberg atom and a ground state atom can fomr trilobites, ultra long-range molecules with binding energies on the Giga Hertz scale or less and with bond length of the order of $N^2$, when $N$ is the Rydberg atomsâ€™s principal quantum number. Do these fragile molecules survive in an environment ? We will show that they even thrive among randomly placed atoms, the natural environment of an ultracold gas [1]. Secondly we discuss the behavior of a Rydberg atom immersed to a 2-dimensional lattice where the Rydberg atom occupies one site while the other sites are occupied with ground state atoms. Due to the degeneracy of highly excited Rydberg manifolds this composite Rydberg atom possesses a non trivial band structure which changes under variation of the lattice constant. Random filling of the lattice sites connects the Composite Rydberg Atom with the trilobite in an ultracold gas. ------------------------ [1] PJJ Luukko and JM Rost, Phys. Rev. Lett. 119, 203001 (2017). [Preview Abstract] |
Tuesday, May 28, 2019 3:30PM - 4:00PM |
D06.00004: Exploring Polarons in Ultracold Atoms Invited Speaker: Eugene Demler The idea of polarons was originally introduced in solid state physics to describe electrons interacting with lattice vibrations in solids. This concept was later applied to study many other important systems including charge dopants interacting with magnetic excitations in Mott insulators and magnetic semiconductors, dynamical impurities and time dependent perturbations in electron systems, optical and transport properties of mesoscopic electronic systems. In the last few years several new types of polaronic systems have been realized experimentally using ultracold atoms, including Bose and Fermi polarons, multiparticle bound states on Rydberg excitations. I will review theoretical and experimental work in this area and discuss new types of models that can be realized, such as a Bosonic Kondo/Central Spin model. [Preview Abstract] |
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