Anomalous Broadening in Driven Dissipative Rydberg Systems

Goldschmidt, Elizabeth A.; Boulier, Thomas; Brown, Richard Harvey; Koller, Silvio; Young, Jeremy T.; Gorshkov, Alexey V.; Rolston, S. L.; Porto, J. V.

doi:10.1103/physrevlett.116.113001

Cited by 120 publications

(165 citation statements)

References 40 publications

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“…1). While the Rydberg dressing is subject to dissipation from the finite lifetime Γ −1 of the Rydberg state [43,44], the interaction-to-decay ratio can be large [49,50] in a 1D system. At fixed Rabi frequency Ω, the ratio of the Ising coupling J to the lifetime γ = (Ω 2 /4∆ 2 )Γ of the Rydberg-dressed state is limited to J/γ = Ω 2 2∆Γ < Ω Γ .…”

Section: Espt ( )mentioning

confidence: 99%

“…For cold atoms, where Floquet control has so far been applied only to single-particle band strucarXiv:1610.07611v3 [cond-mat.quant-gas] 22 Sep 2017 2 tures [29][30][31][37][38][39], recent advances in optically controlling interactions [40][41][42][43][44][45][46][47] offer new opportunities for accessing strongly correlated phases [48][49][50][51]. Notably, coherent spin-spin interactions with a range of several microns [42,43,46,47] can be introduced via Rydberg dressing [42-44, 46, 47, 52-55].…”

Section: Espt ( )mentioning

confidence: 99%

“…3b). In combination, this points to the fact that the two edge modes are well localized to a single site and behave like an EPR pair.Experimental realization-Both the ESPT and FSPT Hamiltonians can be implemented in a chain of Rydbergdressed alkali-metal atoms [43,44,46,49,50] trapped in a 1D optical lattice or tweezer array [83,84] (Fig. 1).…”

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Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems

et al. 2017

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We propose and analyze two distinct routes toward realizing interacting symmetry-protected topological (SPT) phases via periodic driving. First, we demonstrate that a driven transversefield Ising model can be used to engineer complex interactions which enable the emulation of an equilibrium SPT phase. This phase remains stable only within a parametric time scale controlled by the driving frequency, beyond which its topological features break down. To overcome this issue, we consider an alternate route based upon realizing an intrinsically Floquet SPT phase that does not have any equilibrium analog. In both cases, we show that disorder, leading to many-body localization, prevents runaway heating and enables the observation of coherent quantum dynamics at high energy densities. Furthermore, we clarify the distinction between the equilibrium and Floquet SPT phases by identifying a unique micromotion-based entanglement spectrum signature of the latter. Finally, we propose a unifying implementation in a one-dimensional chain of Rydbergdressed atoms and show that protected edge modes are observable on realistic experimental time scales.The discovery of topological insulators-materials which are insulating in their interior but can conduct on their surface-has led to a multitude of advances at the interface of condensed matter physics and materials engineering [1][2][3][4][5]. At their core, such insulators are characterized by the existence of nontrivial topology in their underlying single-particle electronic band structure [6, 7]. Generalizing our understanding of topological phases to the presence of strong many-body interactions represents one of the central questions in modern physics. Some of the simplest generalizations that have emerged along this direction are symmetry-protected topological (SPT) phases [8][9][10], which represent the minimal extension of topological band insulators to include many-body correlations. Featuring short-range entanglement, SPT phases do not exhibit anyonic excitations in their bulk, but nevertheless possess protected edge modes on their surface; as a result, they represent a particularly fertile ground for studying the interplay between symmetry, topology, and interactions.While indirect signatures of certain ground state SPTs have been observed in the solid state [11][12][13], directly probing the quantum coherence of their underlying edge modes represents an outstanding experimental challenge. In principle, cold-atom quantum simulations could offer a powerful additional tool set-including locally-resolved measurements and interferometric protocols-for probing the robustness of edge modes and systematically exploring their stability to specific perturbations [14][15][16][17][18]. Moreover, such platforms could also enable the controlled storage and transmission of quantum information [19][20][21]. Despite these advantages, and owing to the complexity of typical model SPT Hamiltonians, it remains difficult to engineer and stabilize SPT phases in coldatom systems. One approach to t...

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Section: Espt ( )mentioning

confidence: 99%

Section: Espt ( )mentioning

confidence: 99%

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Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems

et al. 2017

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“…7a was taken under low-density conditions to minimize multiparticle interaction effects, which have been reported to strongly modify the width of the observed transitions [70][71][72][73][74]. In our experiments, we perform the excitation of the |42P 3/2 , m j = 3/2 at various densities of ground state atoms and, as shown in fig.…”

Section: Three-photon Spectroscopy Of 42p Rydberg Statesmentioning

confidence: 99%

Interaction Enhanced Imaging of Rydberg P states

Gavryusev

Ferreira-Cao

Kekić

et al. 2016

Eur. Phys. J. Spec. Top.

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The Interaction Enhanced Imaging technique allows to detect the spatial distribution of strongly interacting impurities embedded within a gas of background atoms used as a contrast medium [1]. Here we present a detailed study of this technique, applied to detect Rydberg P states. We experimentally realize fast and efficient three-photon excitation of P states, optimized according to the results of a theoretical effective two-level model. Few Rydberg P -state atoms, prepared in a small cloud with dimensions comparable to the blockade radius, are detected with a good sensitivity by averaging over 50 shots. The main aspects of the technique are described with a hard-sphere model, finding good agreement with experimental data. This work paves the way to a non-destructive optical detection of single Rydberg atoms with high spatial and temporal resolution.

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“…limited the achievable lifetime to less than 1 ms [24][25][26][27]. Recently our group successfully Rydberg dressed a strontium magneto-optical trap (MOT) using the energy level scheme illustrated in figure 1(a), achieving a lifetime of >1 ms [28].…”

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confidence: 99%

Coulomb anti-blockade in a Rydberg gas

et al. 2019

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We perform a comprehensive investigation of the coupling between a Rydberg-dressed atomic gas and an ultra-cold plasma (UCP). Using simultaneous time-resolved measurements of both neutral atoms and ions, we show that plasma formation occurs via a Coulomb anti-blockade mechanism, in which background ions DC Stark shift nearby atoms into resonance at specific distances. The result is a highly correlated growth of the Rydberg population that shares some similarities with that previously observed for van der Waals interactions. We show that a rate equation model that couples the laserdriven Rydberg gas to the UCP via a Coulomb anti-blockade mechanism accurately reproduces both the plasma formation and its subsequent decay. Using long-lived high angular momentum states as a probe, we also find evidence of a crossover from Coulomb anti-blockade to Coulomb blockade at high density. As well as shedding light on loss mechanisms in Rydberg-dressed gases, our results open new ways to create low-entropy states in UCPs. Introduction/motivationHybrid quantum systems of ultracold atoms and ions are emerging as a platform for fundamental research in quantum physics [1]. Recently, Rydberg states have received attention as a way to control the coupling between ionic and atomic systems [2-5], for example, using Coulomb blockade from a single ion to suppress Rydberg excitation [6]. Ultracold mixtures of Rydberg atoms and ions have also been studied in the context of cold Rydberg gases, where it was generally found that ions are almost always present due to processes such as collisions between nearby Rydberg atoms and blackbody photoionization. Indeed, studies using resonant laser excitation of Rydberg states have shown an ultra-cold plasma (UCP) under conditions of strong excitation, both in the pulsed [7-9] and continuously driven [10, 11] regimes.In this paper, we demonstrate that an off-resonant excitation of the Rydberg state can be used to tailor the the interaction between Rydberg atoms and ions in an ultracold gas. We show that plasma formation occurs via a Coulomb anti-blockade mechanism, illustrated in figure 1(b), where background ions DC Stark shift nearby atoms into resonance at specific distances. The result is a highly correlated 'facilitated growth' of the Rydberg population that shares some similarities with that previously observed using van der Waals anti-blockade [12]. A rate equation model that couples the driven Rydberg gas to an UCP via this correlated excitation model accurately reproduces both the initial creation and subsequent decay of the observed ion signal. At longer times, the ionization of long-lived high angular momentum Rydberg states produced in the plasma provides evidence for the interplay between Coulomb blockade [6] and Coulomb anti-blockade in the plasma. In future experiments, controlling this process could provide a route to creating an UCP with a strongly correlated ionic state [13].Our results also provide a strategy for minimising losses due to ionization in cold Rydberg gas experiments, p...

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Anomalous Broadening in Driven Dissipative Rydberg Systems

Cited by 120 publications

References 40 publications

Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems

Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems

Interaction Enhanced Imaging of Rydberg P states

Coulomb anti-blockade in a Rydberg gas

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