Efficient three-photon excitation of quasi-one-dimensional strontium Rydberg atoms with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>n</mml:mi><mml:mo>∼</mml:mo><mml:mn>300</mml:mn></mml:mrow></mml:math>

Ye, S.; Zhang, X.; Dunning, F. B.; Yoshida, Shuhei; Hiller, Moritz; Burgdorfer, J.

doi:10.1103/physreva.90.013401

Cited by 16 publications

(16 citation statements)

References 29 publications

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“…Spin-orbit interaction is included, but its effects are small [23]. The model potential is fitted to reproduce the measured energy levels in the singlet sector [25], and yields the quantum defect δ = 3.376 for 3 S 1 states, which agrees well with the more precise measured value. The calculated wave functions for 3 S 1 Rydberg states with n ∼ 30 are dominated by a single configuration…”

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confidence: 63%

Ultra-long-range Rydberg molecules in a divalent atomic system

et al. 2015

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supporting

confidence: 63%

Ultra-long-range Rydberg molecules in a divalent atomic system

et al. 2015

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“…Core penetration leads to sizable quantum defects for the non-degenerate low-L states and to the appearance of avoided crossings between Stark states. these calculations the wave functions for low-L (L ≤ 6) states are obtained using a two-active-electron model and the higher L states are approximated by hydrogenic wave functions [31]. Classically, the energy separations at the avoided crossings represent the precession rates associated with scattering of the Rydberg electron by the core ion.…”

Section: State-selective Field Ionization Spectramentioning

confidence: 99%

Lifetimes of ultralong-range strontium Rydberg molecules in a dense Bose-Einstein condensate

Whalen¹,

Camargo²,

Ding³

et al. 2017

Phys. Rev. A

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The lifetimes and decay channels of ultralong-range Rydberg molecules created in a dense BEC are examined by monitoring the time evolution of the Rydberg population using field ionization. Studies of molecules with values of principal quantum number, n, in the range n = 49 to n = 72 that contain tens to hundreds of ground state atoms within the Rydberg electron orbit show that their presence leads to marked changes in the field ionization characteristics. The Rydberg molecules have lifetimes of ∼ 1 − 5 µs, their destruction being attributed to two main processes: formation of Sr + 2 ions through associative ionization, and dissociation induced through L-changing collisions. The observed loss rates are consistent with a reaction model that emphasizes the interaction between the Rydberg core ion and its nearest neighbor ground-state atom. The measured lifetimes place strict limits on the time scales over which studies involving Rydberg species in cold, dense atomic gases can be undertaken and limit the coherence times for such measurements.

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“…This we have accomplished in an apparatus that utilizes a low-density, ∼10 9 cm −3 strontium atom beam [29] rather than a trapped cold atomic gas. In the current work, strongly focused laser beams create an excitation volume whose size, ∼ 50 × 50 × 70 μm, is comparable to the blockade radius.…”

mentioning

confidence: 99%

“…1) is a modified version of that used in earlier experiments in this laboratory [28][29][30]. Strontium atoms in a tightly collimated beam are excited to selected high-n F states at the center of an interaction region defined by three pairs of copper electrodes.…”

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Rydberg blockade effects atn∼300in strontium

et al. 2015

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Rydberg blockade at n ∼ 300, is examined using strontium n 1 F3 Rydberg atoms excited in an atomic beam in a small volume defined by two tightly focused crossed laser beams. The observation of blockade for such states is challenging due to their extreme sensitivity to stray fields and the many magnetic sublevels associated with F states which results in a high local density of states. Nonetheless, with a careful choice of laser polarization to selectively excite only a limited number of these sublevels, sizable blockade effects are observed on an ∼ 0.1 mm length scale extending blockade measurements into the near-macroscopic regime and enabling study of the dynamics of strongly coupled many-body high-n Rydberg systems under carefully controlled conditions. The strong interactions between Rydberg atoms can lead to the formation of strongly correlated many-body systems [1,2] and have enabled the generation of entanglement between neighboring atoms [3][4][5], the realization of quantum gates [6,7], and the observation of many-body Rabi oscillations [8]. Detailed study of Rydberg atom-Rydberg atom interactions requires the production of Rydberg atoms with well-defined initial separations and control of their interactions by manipulating their states [9] or their separations [10]. n ∼ 300-500 atoms provide new opportunities to form unusually strongly interacting Rydberg systems far from the ground state and to study their time-dependent collective electron wave-packet dynamics.Key to the production of single Rydberg atoms in welldefined regions in space is the dipole blockade [11][12][13][14][15][16][17][18][19][20][21] which prevents resonant excitation of nearby atoms due to the level shift afforded by the Rydberg atom already formed. This results in the formation of "superatoms" by entangling those atoms within the blockade radius. Since the strength of Rydberg-Rydberg interactions scales strongly with n [22][23][24][25][26], for example, the coefficient of the van der Waals (vdW) interaction, c 6 /R 6 , scales as c 6 ≈ n 11 , blockade radii also increase rapidly with n. Previous studies of the Rydberg blockade typically involved atoms with quantum numbers n ∼ 40 − 100 resulting in blockade radii 10 μm [14,27]. Here we extend Rydberg blockade measurements to much larger values of n and into the macroscopic regime. Order of magnitude estimates suggest that for n 300 blockade radii should be 0.1 mm. In this Rapid Communication we present experimental evidence for, and scaled quantum simulations of, strong blockade at such length (and energy) scales. This promises to enable the quantum entanglement of near macroscopic atomic states. The long time scales characteristic of high n states (∼ 4 ns at n = 300) permits time-resolved measurements of the electron motion [9,28] that could lead to a deeper understanding of the dynamics of Rydberg-Rydberg interactions and quantum to classical crossover in Rydberg pair interactions.The principal challenge in preparing and manipulating high-n atoms is to achieve precise control of...

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Efficient three-photon excitation of quasi-one-dimensional strontium Rydberg atoms withn∼300

Cited by 16 publications

References 29 publications

Ultra-long-range Rydberg molecules in a divalent atomic system

Ultra-long-range Rydberg molecules in a divalent atomic system

Lifetimes of ultralong-range strontium Rydberg molecules in a dense Bose-Einstein condensate

Rydberg blockade effects atn∼300in strontium

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