Ultrafast Creation of Overlapping Rydberg Electrons in an Atomic BEC and Mott-Insulator Lattice

Mizoguchi, Miwako; Zhang, Y.; Kunimi, Masaya; Tanaka, Akira; Takeda, Shuntaro; Takei, Nobuyuki; Bharti, Vineet; Koyasu, Kuniaki; Kishimoto, T.; Jaksch, Dieter; Glaetzle, Alexander W.; Kiffner, Martin; Masella, G.; Pupillo, Guido; Weidemüller, Matthias; Ohmori, Kenji

doi:10.1103/physrevlett.124.253201

Cited by 25 publications

(19 citation statements)

References 52 publications

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“…In addition, if multiple Rydberg states are involved, the competition between dipole-dipole and cavity-mediated exchange interactions may lead to nontrivial scenarios. Further, if we allowed overlap of the Rydberg orbitals of two excitations, the strong Coulomb interactions between the delocalized electrons may lead to novel correlated phases, assuming the Penning ionization rates can be significantly suppressed [89]. Our analysis on bound states of two excitations can shed light on the mechanisms for stabilizing bound states by repulsive interactions, using a completely different setup compared to the traditional Hubbard models.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of Rydberg excitations and quantum correlations in an atomic array coupled to a photonic crystal waveguide

et al. 2020

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We study the dynamics of up to two Rydberg excitations and the correlation growth in a chain of atoms coupled to a photonic crystal waveguide. In this setup, an excitation can hop from one atom to another via exponentially decaying exchange interactions mediated by the waveguide. An initially localized excitation undergoes a continuous-time quantum walk for short-range hopping, and for long-range hopping, it experiences quasilocalization. In addition, the inverse participation ratio reveals a superballistic diffusion of the excitation in short times, whereas, at a long time, it becomes ballistic. For two initially localized excitations, intriguing and complex dynamical scenarios emerge for different initial separations due to the competition between the Rydberg-Rydberg and exchange interactions. In particular, the two-point correlation reveals a light-cone behavior even for sufficiently long-range exchange interactions. Additionally, we characterize the growth of bipartite entanglement entropy, which exhibits a global bound if only one excitation is present in the dynamics. Finally, we analyze the effect of imperfections due to spontaneous emission from the Rydberg state into photons outside the waveguide and show that all of the physical phenomena we predict are well within experimental reach.

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Section: Discussionmentioning

confidence: 99%

Dynamics of Rydberg excitations and quantum correlations in an atomic array coupled to a photonic crystal waveguide

et al. 2020

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“…By taking advantage of our ultrafast approach, the long-time dynamics, orders of magnitude longer than the interaction timescale, could also address many-body thermalization and localization problems in our isolated quantum system [58][59][60] without being affected by environmental noises or the radiative lifetime. Most interestingly, our ultrafast Ramsey measurement could uncover the many-body electronic states and the nonequilibrium dynamics in the metal-like quantum gas regime, where the electric charges overlap between the NN lattice site, which is an exotic state of matter that was recently realized for the first time by our ultrafast broadband laser excitation that circumvents the Rydberg blockade [36,61].…”

Section: Ramsey Interferogrammentioning

confidence: 99%

“…Facilitated excitation with frequency-detuned CW laser has been developed to reach shorter atomic distance, however, it gives strong constraints [31][32][33][34][35]. Broadband laser excitation with an ultrashort pulse can directly circumvent the blockade effect even at the nearest-neighbor (NN) distance in optical lattices [36]. This leads to the highest Rydberg density with GHz-scale interaction, three orders of magnitude larger than the CW approach [13,23,24].…”

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confidence: 99%

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Ultrafast Many-Body Dynamics in an Ultracold Rydberg-Excited Atomic Mott Insulator

Bharti¹,

Sugawa²,

Mizoguchi³

et al. 2022

Preprint

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We report the observation and control of ultrafast non-equilibrium many-body electron dynamics in Rydbergexcited spatially-ordered ultracold atoms created from a three-dimensional unity-filling atomic Mott insulator. By implementing time-domain Ramsey interferometry with attosecond precision in our Rydberg atomic system, we observe picosecond-scale ultrafast many-body dynamics that is essentially governed by the emergence and evolution of many-body correlations between long-range interacting atoms in an optical lattice. We analyze our observations with different theoretical approaches and find that quantum fluctuations have to be included beyond semi-classical descriptions to describe the observed dynamics. Our Rydberg lattice platform combined with an ultrafast approach, which is robust against environmental noises, opens the door for simulating stronglycorrelated electron dynamics by long-range van der Waals interaction and resonant dipole-dipole interaction to the charge-overlapping regime in synthetic ultracold atomic crystals.

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“…Here, we take a first step into achieving an entanglement protocol with Rydberg atoms at the speed limit set by the dipole-dipole interaction. Two single 87 Rb atoms separated by a distance as small as 1.5 µm are both excited to a nD Rydberg state by using pulsed lasers with a duration of tens of picoseconds [39,40]. This is faster than the timescale of interaction J but slow enough to resolve the Rydberg orbitals whose splitting (∆E n /∆n) −1 is 10 ps at n = 40.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale

Chew,

Tomita,

Mahesh

et al. 2021

Preprint

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Rydberg atoms, with their giant electronic orbitals, exhibit dipole-dipole interaction reaching the GHz range at a distance of a micron, making them a prominent contender for realizing quantum operations well within their coherence time. However, such strong interactions have never been harnessed so far, mainly because of the stringent requirements on the fluctuation of the atom positions and the necessary excitation strength. Here, using atoms trapped in the motional groundstate of optical tweezers and excited to a Rydberg state with picosecond pulsed lasers, we observe an interaction-driven energy exchange, i.e., a Förster oscilation, occuring in a timescale of nanoseconds, two orders of magnitude faster than in any previous work with Rydberg atoms. This ultrafast coherent dynamics gives rise to a conditional phase which is the key resource for an ultrafast controlled-Z gate. This opens the path for quantum simulation and computation operating at the speed-limit set by dipole-dipole interactions with this ultrafast Rydberg platform.

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Ultrafast Creation of Overlapping Rydberg Electrons in an Atomic BEC and Mott-Insulator Lattice

Cited by 25 publications

References 52 publications

Dynamics of Rydberg excitations and quantum correlations in an atomic array coupled to a photonic crystal waveguide

Dynamics of Rydberg excitations and quantum correlations in an atomic array coupled to a photonic crystal waveguide

Ultrafast Many-Body Dynamics in an Ultracold Rydberg-Excited Atomic Mott Insulator

Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale

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