Unity Occupation of Sites in a 3D Optical Lattice

DePue, Marshall T.; McCormick, Colin; Winoto, S. Lukman; Oliver, Steven; Weiss, David S.

doi:10.1103/physrevlett.82.2262

Cited by 163 publications

(139 citation statements)

References 25 publications

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“…Generally both channels are present; but which is more likely depends on the dynamics of the atoms in the trap under the influence of laser cooling. The existence of collisional single atom ejection allows us to exceed the 50% isolation efficiency of individual atoms previously reported when using red-detuned light-assisted collisions [10][11][12][13]. The onset of other loss mechanisms still limits our single atom loading efficiency to 63%.…”

Section: Pacs Numbersmentioning

confidence: 99%

“…Whereas it obscures parity measurements it may enhance the efficiency P beyond 50% when light-assisted collisions are used for the isolation of individual atoms in optical microtraps [10][11][12][13]. A high P is important to applications where multiple traps have to be loaded each with one atom simultaneously [23].…”

mentioning

confidence: 99%

“…This phenomenon is of fundamental interest [9] and plays a crucial role in modern laser cooling experiments. In addition, light-assisted collisions have been employed to isolate individual atoms in optical microtraps [10][11][12][13][14], to redistribute atoms loaded into an array of traps [15], and to perform parity number measurement of atoms in optical lattices [16,17]. Isolation experiments that used bluedetuned light to induce collisions have achieved high efficiency, whereas experiments using red detuned light have reported efficiencies of about 50%.…”

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Dynamics of two atoms undergoing light-assisted collisions in an optical microtrap

et al. 2013

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We study the dynamics of atoms in optical traps when exposed to laser cooling light that induces light-assisted collisions. We experimentally prepare individual atom pairs and observe their evolution. Due to the simplicity of the system (just two atoms in a microtrap) we can directly simulate the pair's dynamics, thereby revealing detailed insight into it. We find that often only one of the collision partners gets expelled, similar to when using blue detuned light for inducing the collisions. This enhances schemes for using light-assisted collisions to prepare individual atoms and affects other applications as well. PACS numbers:Optically trapped cold atoms provide an exciting platform for studying the change in atom-atom interactions due to absorption or emission of light. The advantage of such a system is that the atoms are isolated from their surroundings and basic physical effects in photochemistry can be studied without interference from processes induced by the environment. Recently this has led to controlled formation of ultra-cold molecular gases [1,2] and in the past, photo-association spectroscopy has provided detailed knowledge about atom-atom interaction potentials [3,4].Typically, experiments on photo-association or lightassisted collisions of cold atoms are conducted on large samples. Studying microscopic processes at the individual event level reveals information hidden in ensemble averages of larger samples [5,6]. Pioneering work in studying individual light-assisted collisions was conducted using small samples of atoms in a high gradient MagnetoOptical Trap (MOT) [7,8]. Those studies observed that up to 10% of loss events manifested themselves as just one of the collision partners being lost from the MOT.Of particular interest to many modern experiments in atomic physics are light-assisted collisions or photoassociation events induced by near-resonant light. This phenomenon is of fundamental interest [9] and plays a crucial role in modern laser cooling experiments. In addition, light-assisted collisions have been employed to isolate individual atoms in optical microtraps [10][11][12][13][14], to redistribute atoms loaded into an array of traps [15], and to perform parity number measurement of atoms in optical lattices [16,17]. Isolation experiments that used bluedetuned light to induce collisions have achieved high efficiency, whereas experiments using red detuned light have reported efficiencies of about 50%. For several of these applications it is assumed that both atoms of the pair are lost from the optical microtrap when they undergo light-assisted collisions.Here we revisit the ejection of atoms from a far off resonance optical trap due to light-assisted collisions induced by red-detuned laser cooling light. We implement the idealized collision experiment in which only two atoms are trapped so we can observe individual atom loss events. A numerical model of the complex dynamics of the expelling process agrees well with our experiment. We find that the light-assisted collisions can lead to j...

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Dynamics of two atoms undergoing light-assisted collisions in an optical microtrap

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“…We begin by collecting %10 6 cesium atoms from background vapor in a standard magneto-optic trap (MOT) [33], over the course of 4 s. The temperature of atoms released directly from the MOT is of order 10 lK. After collecting the atoms, we turn off the MOT and further cool the atoms with a 3D-lattice cooling scheme similar to that developed by Weiss and his collaborators [34]. The atoms are loaded from the MOT into a 3D, far-detuned, linearly polarized optical lattice.…”

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Timing noise effects on dynamical localization

Oskay

Steck

Raizen

2003

Chaos, Solitons & Fractals

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The quantum kicked rotor is studied experimentally in an atom-optics setting, where we observe the center-of-mass motion of cold cesium atoms. Dynamical localization in this system typically suppresses classical diffusive motion, but is susceptible to the addition of various forms of noise. We study in detail the effects of timing noise, where variations are introduced to the times at which the kicks occur. This noise is particularly interesting because it does not directly induce momentum diffusion. However, it is found that the addition of timing noise efficiently destroys both the classical correlations that give rise to fluctuations in the classical diffusion rate as well as quantum coherences that lead to dynamical localization. Ó 2002 Elsevier Science Ltd. All rights reserved.The interface between quantum and classical dynamics serves as a testing ground for decoherence and is a central feature of mesoscopic physics. It is believed that decoherence, the destruction of quantum interferences, is necessary to reconcile the distinctly different behavior in the quantum and classical limits [1]. Experimental progress towards understanding decoherence has been made on a number of different fronts. One system that has the advantage of conceptual simplicity is a perturbed atom interferometer [2,3], where spontaneous scattering introduces dissipation into the system. Decoherence has also been observed with Rydberg atoms coupled to microwave cavities [4] and motional Schr€ o odinger cat states in an ion trap [5].One of the most interesting settings in which to study correspondence is a classically chaotic system, where quantum effects suppress classical diffusive motion [6]. While the majority of research in decohering effects on ''quantum chaos'' has been theoretical in nature [7][8][9][10][11], there has been a steadily growing body of experimental work in recent years. Some of the pioneering experiments in this field have been conducted by studying the internal dynamics of Rydberg atoms [12][13][14][15]. Mesoscopic condensed-matter systems have provided another important testing ground [16]. Recent great advances in atom optics, the manipulation of atomic de Broglie waves, have also made it possible to study quantum dynamics by observing the center-of-mass motion of cold atoms [17,18]. Here, laboratory tests have allowed the direct observation of such phenomena as dynamical localization [19], quantum resonances [20], and chaos-assisted tunneling [21].Of particular interest is dynamical localization [22], a quantum suppression of classically chaotic (diffusive) motion. A prototypical system is the kicked rotor, or standard map, which has been a model system for the study of both classical and quantum chaos. The kicked rotor is a particularly suitable system for experimental study because it can be directly realized by exposing cold atoms to a pulsed standing wave of light. Classical particles in such a chaotic potential tend to exhibit diffusive behavior, where the energy of the system grows linearly as a f...

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“…Durch den globalen Effekt der Gitterverschiebung kön-nen ganze Gruppen von benachbarten Atomen durch eine einzige Gitterverschiebung verschränkt werden. Eine Voraussetzung ist dabei, daß möglichst viele benachbarte Gitterplätze besetzt und die Atome in den Grundzustand gekühlt worden sind [30,32]. Durch solche kontrollierte Stoßprozesse wäre der Weg zu einer Vielzahl neuer Anwendungen eröffnet.…”

Section: Optische Gitterunclassified

Quantencomputer: Wie sich Verschränkung für die Informationsverarbeitung nutzen läßt

Briegel¹,

Cirac²,

Zoller³

1999

Phys. Bl.

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Die Quantenmechanik eröffnet faszinierende Perspektiven für die Kommunikation und die Informationsverarbeitung. Auf einen universell programmierbaren Quantenrechner wird man zwar noch längere Zeit warten müssen. Doch die beachtlichen Fortschritte in einigen Labors lassen elementare Quantenprozessoren realistisch erscheinen, die in einigen Jahren mit einer Anzahl von etwa zehn Quantenbits und einer Fehlerrate im Prozentbereich arbeiten könnten. Auch wenn man damit noch keine beeindruckenden Rechnungen durchführen kann, lassen sich solche Prozessoren für wichtige Aufgaben in der Quantenkommunikation einsetzen. Für ihre Vernetzung spielen die Teleportation und der “Quantenrepeater” eine zentrale Rolle.

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Unity Occupation of Sites in a 3D Optical Lattice

Cited by 163 publications

References 25 publications

Dynamics of two atoms undergoing light-assisted collisions in an optical microtrap

Dynamics of two atoms undergoing light-assisted collisions in an optical microtrap

Timing noise effects on dynamical localization

Quantencomputer: Wie sich Verschränkung für die Informationsverarbeitung nutzen läßt

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