Quantum Dynamics with Spatiotemporal Control of Interactions in a Stable Bose-Einstein Condensate

Clark, Logan W.; Ha, Li-Chung; Xu, Chenyu; Chin, Cheng

doi:10.1103/physrevlett.115.155301

Cited by 127 publications

(145 citation statements)

References 47 publications

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“…Firstly, the difference in polarizability of state |a and |m leads to a differential shift δ CM Lattice ∝ 2α ( 1 S0) − α m I Lattice as the external potentials experienced by the CM differ, where α ( 1 S0) is the polarizability of a ground-state atom and α m the polarizability of a molecule in state |m . Since the polarizability of weakly-bound molecules for far detuned light is close to the sum of the atomic polarizabilities of the constituent atoms we expect this shift to be small [35,36]. Secondly, the external confinement induces a differential shift on the eigenenergies of the relative motion Hamiltonian, leading to δ rel Lattice .…”

Section: Light Shifts From Lattice Lightmentioning

confidence: 99%

Efficient production of long-lived ultracold Sr2 molecules

et al. 2017

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We associate Sr atom pairs on sites of a Mott insulator optically and coherently into weaklybound ground-state molecules, achieving an efficiency above 80%. This efficiency is 2.5 times higher than in our previous work [S. Stellmer, B. Pasquiou, R. Grimm, and F. Schreck, Phys. Rev. Lett. 109, 115302 (2012)] and obtained through two improvements. First, the lifetime of the molecules is increased beyond one minute by using an optical lattice wavelength that is further detuned from molecular transitions. Second, we compensate undesired dynamic light shifts that occur during the stimulated Raman adiabatic passage (STIRAP) used for molecule association. We also characterize and model STIRAP, providing insights into its limitations. Our work shows that significant molecule association efficiencies can be achieved even for atomic species or mixtures that lack Feshbach resonances suitable for magnetoassociation.

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Section: Light Shifts From Lattice Lightmentioning

confidence: 99%

Efficient production of long-lived ultracold Sr2 molecules

et al. 2017

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“…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 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%

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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“…Ref. [97] has demonstrated a spatial density modulation using an optical Feshbach resonance of bosons, and one may also use inhomogeneous confinement potentials to modulate the interactions in real space [104][105][106][107]. The external magnetic field can change the initial interaction [95] while the optical control provides an interaction imbalance.…”

Section: Experimental Implicationsmentioning

confidence: 99%

“…A spatial interaction imbalance can be produced experimentally by nonuniform magnetic field [95,96], or optical control of the atomic collisions [97][98][99][100][101][102][103]. Ref.…”

Section: Experimental Implicationsmentioning

confidence: 99%

Quantification of the memory effect of steady-state currents from interaction-induced transport in quantum systems

Lai

Chien

2017

Phys. Rev. A

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Dynamics of a system in general depends on its initial state and how the system is driven, but in many-body systems the memory is usually averaged out during evolution. Here, interacting quantum systems without external relaxations are shown to retain long-time memory effects in steady states. To identify memory effects, we first show quasi-steady state currents form in finite, isolated Bose and Fermi Hubbard models driven by interaction imbalance and they become steady-state currents in the thermodynamic limit. By comparing the steady state currents from different initial states or ramping rates of the imbalance, long-time memory effects can be quantified. While the memory effects of initial states are more ubiquitous, the memory effects of switching protocols are mostly visible in interaction-induced transport in lattices. Our simulations suggest the systems enter a regime governed by a generalized Fick's law and memory effects lead to initial-state dependent diffusion coefficients. We also identify conditions for enhancing memory effects and discuss possible experimental implications.

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Quantum Dynamics with Spatiotemporal Control of Interactions in a Stable Bose-Einstein Condensate

Cited by 127 publications

References 47 publications

Efficient production of long-lived ultracold Sr2 molecules

Efficient production of long-lived ultracold Sr2 molecules

Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems

Quantification of the memory effect of steady-state currents from interaction-induced transport in quantum systems

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