Trapping ions and atoms optically

Schaetz, Tobias

doi:10.1088/1361-6455/aa69b2

Cited by 45 publications

(38 citation statements)

References 88 publications

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“…Other long-range interaction potentials (of the form C n /r n with n>3) are characterized by similar but distinct universal functions constituting different universality classes for QDU (see appendix D). Future work will explore the universality for potentials with n=4, 5, relevant for loss rates measurements of trapped molecules and ions from shallow traps [28][29][30]. Figure 3.…”

Section: Discussionmentioning

confidence: 99%

Universality of quantum diffractive collisions and the quantum pressure standard

et al. 2019

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This work demonstrates that quantum diffractive collisions are governed by a universal law characterized by a single parameter that can be determined experimentally. Specifically, we report a quantitative form of the universal, cumulative energy distribution transferred to initially stationary sensor particles by quantum diffractive collisions. The characteristic energy scale corresponds to the localization length associated with the collision-induced quantum measurement, and the shape of the universal function is determined only by the analytic form of the interaction potential at long range. Using cold 87 Rb sensor atoms confined in a magnetic trap, we observe experimentally p QDU6 , the universal function specific to van der Waals collisions, and use it to realize a self-defining particle pressure sensor that can be used for any ambient gas. This provides the first primary and quantum definition of the Pascal, applicable to any species and therefore represents a fundamental advance for vacuum and pressure metrology. The quantum pressure standard realized here is compared with a state-of-the-art orifice flow standard transferred by an ionization gauge calibrated for N 2 . The pressure measurements agree at the 0.5% level. m d 4 2 t  º p s ̶ [4]. Here m t is the mass of the sensor particle and s ̶ is the thermally-averaged total collision cross section, including contributions from both elastic and inelastic scattering. We further demonstrate that s ̶ is independent of the short-range interaction between the colliding particles with van der Waals long-range interactions.It is well known that collisions resulting in small momentum transfer are dominated by quantum diffractive scattering [4,5]. Such collisions occur with small scattering angles 0 q  and are predominantly determined by OPEN ACCESS RECEIVED

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Section: Discussionmentioning

confidence: 99%

Universality of quantum diffractive collisions and the quantum pressure standard

et al. 2019

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“…Since the radio frequency trap limits attainable temperatures due to micromotion, a promising new route towards colder ion-atom mixture is to use alternative trapping methods for the ion. In recent years, optical trapping of ions in optical tweezers and optical lattices has been demonstrated (Enderlein et al, 2012;Huber et al, 2014;Schaetz, 2017;Schneider et al, 2012aSchneider et al, , 2010a. Obviously the optical trapping potential, which interacts with the dipole polarizability of the ion, is much shallower than that of the radio frequency trap, which interact with the charge of the ion.…”

Section: Optical Ion Trappingmentioning

confidence: 99%

Cold hybrid ion-atom systems

et al. 2019

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Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper reviews the theoretical and experimental progress in research on cold hybrid ion-atom systems which aim to combine the best features of the two well-established fields. We provide a broad overview of the theoretical description of ion-atom mixtures and their applications, and report on advances in experiments with ions trapped in Paul or dipole traps overlapped with a cloud of cold atoms, and with ions directly produced in a Bose-Einstein condensate. We start with microscopic models describing the electronic structure, interactions, and collisional physics of ion-atom systems at low and ultralow temperatures, including radiative and non-radiative charge transfer processes and their control with magnetically tunable Feshbach resonances. Then we describe the relevant experimental techniques and the intrinsic properties of hybrid systems. In particular, we discuss the impact of the micromotion of ions in Paul traps on ion-atom hybrid systems. Next, we review recent proposals for using ions immersed in ultracold gases for studying cold collisions, chemistry, many-body physics, quantum simulation, and quantum computation and their experimental realizations. In the last part we focus on the formation of molecular ions via spontaneous radiative association, photoassociation, magnetoassociation, and sympathetic cooling. We discuss applications and prospects of cold molecular ions for cold controlled chemistry and precision spectroscopy.

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“…Optical dipole traps have been established in experiments for neutral particles for decades [16]. Recently, trapping and isolation of a single ion in a dipole trap was demonstrated for seconds [17,18], comparable to the lifetime of neutral atoms for similar trapping conditions [19] and in agreement with theoretical predictions [20]. Several groups have also superimposed optical lattices with Coulomb Crystals trapped in rf traps [21][22][23], which, e.g., allowed to study fundamental questions in the context of friction [24].…”

Section: Introductionmentioning

confidence: 99%

Optical Trapping of Ion Coulomb Crystals

et al. 2018

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The electronic and motional degrees of freedom of trapped ions can be controlled and coherently coupled on the level of individual quanta. Assembling complex quantum systems ion by ion while keeping this unique level of control remains a challenging task. For many applications, linear chains of ions in conventional traps are ideally suited to address this problem. However, driven motion due to the magnetic or radio-frequency electric trapping fields sometimes limits the performance in one dimension and severely affects the extension to higher-dimensional systems. Here, we report on the trapping of multiple barium ions in a single-beam optical dipole trap without radio-frequency or additional magnetic fields. We study the persistence of order in ensembles of up to six ions within the optical trap, measure their temperature, and conclude that the ions form a linear chain, commonly called a one-dimensional Coulomb crystal. As a proof-of-concept demonstration, we access the collective motion and perform spectrometry of the normal modes in the optical trap. Our system provides a platform that is free of driven motion and combines advantages of optical trapping, such as state-dependent confinement and nanoscale potentials, with the desirable properties of crystals of trapped ions, such as long-range interactions featuring collective motion. Starting with small numbers of ions, it has been proposed that these properties would allow the experimental study of many-body physics and the onset of structural quantum phase transitions between one-and two-dimensional crystals.

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Trapping ions and atoms optically

Cited by 45 publications

References 88 publications

Universality of quantum diffractive collisions and the quantum pressure standard

Universality of quantum diffractive collisions and the quantum pressure standard

Cold hybrid ion-atom systems

Optical Trapping of Ion Coulomb Crystals

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