Eliminating light shifts for single atom trapping

Hutzler, Nicholas R.; Liu, Lee R.; Yu, Yang; Ni, Kang-Kuen

doi:10.1088/1367-2630/aa5a3b

Cited by 48 publications

(37 citation statements)

References 30 publications

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“…4e), similar to those implemented for neutral atoms [85,86,87,88]. Another direction is to produce new species of molecules, such as KCs [89], NaCs [90] and open shell molecules such as RbSr [91,92], LiYb [93], and CsYb [94].…”

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New frontiers for quantum gases of polar molecules

et al. 2016

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The field of ultracold quantum matter has burgeoned over the last few decades, thanks to the growing capabilities for atomic systems to be probed and manipulated with exquisite control. Researchers can now precisely create and study quantum manybody states that are effectively isolated from the external environment. Much of the work in ultracold matter has focused on systems of alkali or alkaline-earth atoms, mainly due to their ease of cooling. Extending this precise control to molecules has seen rapidly increasing interest and activity, as molecules possess additional degrees of freedom that make them useful for tests of fundamental physics, studying ultracold chemistry and collisions, and engineering qualitatively new types of quantum phases and quantum many-body systems. Here, we review one particularly fruitful research direction: the creation and manipulation of ultracold bialkali molecules. The recent success in creating a quantum gas of polar molecules opens many exciting research opportunities. Atomic, Molecular, and Optical (AMO) systems offer experimentalists the ability to precisely control interactions in a quantum many-body system [1,2], and a rich set of experiments has already been performed. Some prominent examples include studies of the BEC-BCS crossover in two-component Fermi gases [3,4,5] and the superfluid-Mott insulator transition in ultracold bosons loaded into a 3D optical lattice [6]. Neutral atomic systems normally have point-like contact interactions that can be parametrized with a single quantity, the scattering length a, which can be tuned via a Feshbach resonance [2]. In recent years, systems with long-range and anisotropic interactions have garnered much attention. One natural example is the dipolar interaction between polar molecules, which is the focus of this Review. Of course, many other experimental platforms are also being pursued that feature long-range interactions, including highly magnetic atoms [7,8], trapped ions The dipolar interaction exhibits several important attributes. First, the energy scales in dipolar systems are usually much larger than those in typical atomic alkali systems, making it easier to study interaction-driven structural properties and non-equilibrium dynamics. Second, and perhaps more importantly, the anisotropic and long-range nature of the interaction allows for the realization of novel quantum phases, especially when the spatial dimensions of the system can be varied with optical lattices. Some of these engineered systems may find relevance to outstanding problems in condensed-matter physics [13,14]; moreover, qualitatively new types of physics can emerge in the presence of long-range interactions [15,16,17,18,19,20,21]. As a specific example of a unique feature of long-range interactions, a spin-1/2 Hamiltonian can be encoded based on a pair of oppositeparity rotational states where dipolar interactions give rise to a direct spin exchange coupling between molecules [22,23]. With this scheme implemented in an optical lattice, many-body spin dynam...

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New frontiers for quantum gases of polar molecules

et al. 2016

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“…(C) Schematic of the cooling pulse sequence. The tweezer is strobed at 3 MHz to reduce light shifts during optical pumping [29]. Each cooling cycle consists of 8 sideband pulses.…”

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“…Second, the tweezers cause a large light shift (as large as 300 MHz) in the excited state. We address this by strobing the trapping light at a rate of 3 MHz during the whole cooling sequence, similar to our loading and imaging process [29], while leaving OP on with constant intensity. Due to the large light shift, the OP is effectively off whenever the trap light is on.…”

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Motional-ground-state cooling outside the Lamb-Dicke regime

Hutzler

Zhang

et al. 2018

Phys. Rev. A

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We report Raman sideband cooling of a single sodium atom to its three-dimensional motional ground state in an optical tweezer. Despite a large Lamb-Dicke parameter, high initial temperature, and large differential light shifts between the excited state and the ground state, we achieve a ground state population of 93.5(7)% after 53 ms of cooling. Our technique includes addressing high-order sidebands, where several motional quanta are removed by a single laser pulse, and fast modulation of the optical tweezer intensity. We demonstrate that Raman sideband cooling to the 3D motional ground state is possible, even without tight confinement and low initial temperature.

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“…While deep optical tweezers are a versatile and convenient tool to prepare [5], move [6], and hold [7] individual atoms, the trapping field can also have undesired consequences like shortened qubit coherence times. Thus the sensitivity of the qubit coherence to light shifts has been extensively investigated for various experimental configurations [8][9][10][11][12], including very tightly focused optical tweezers [13,14]. Little explored are light shift induced effects on optical transitions beyond line shifts [15]; an example is the optically induced breakdown of the atomic hyperfine coupling [16].…”

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confidence: 99%

Transmission spectroscopy of a single atom in the presence of tensor light shifts

2019

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We investigate the interplay between Zeeman and light shifts in the transmission spectrum of an optically trapped, spin-polarized Rubidium atom. The spectral shape of the transmission changes from multiple, broad resonances to a single, narrow Lorentzian with a high resonant extinction value when we increase the magnetic field strength and lower the depth of the dipole trap. We present an experimental configuration well-suited for quantum information applications that enables not only efficient light-atom coupling, but also a long coherence time between ground state hyperfine levels. Zeeman and light shift HamiltonianWe consider an optically trapped 87 Rb atom in a magnetic field applied along the quantization axis (z-axis, see figure 1(a)). The magnetic field lifts the degeneracy of the Zeeman levels with the corresponding OPEN ACCESS RECEIVED

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Eliminating light shifts for single atom trapping

Cited by 48 publications

References 30 publications

New frontiers for quantum gases of polar molecules

New frontiers for quantum gases of polar molecules

Motional-ground-state cooling outside the Lamb-Dicke regime

Transmission spectroscopy of a single atom in the presence of tensor light shifts

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