Spectroscopy of an ultracold Rydberg gas and signatures of Rydberg–Rydberg interactions

Singer, Kilian; Reetz‐Lamour, M.; Amthor, Thomas; Fölling, Simon; Tscherneck, M.; Weidemüller, Matthias

doi:10.1088/0953-4075/38/2/023

Cited by 36 publications

(32 citation statements)

References 21 publications

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“…3, the attractive potential of the 81P 3/2 pair state is much stronger bent by the interaction than for the 81P 1/2 pair state due to an accidental near-resonant enhancement in the C 6 van-der-Waals coefficient. Qualitatively similar features we have also observed in the red wing of S-state resonances [16,17]. 3, the interaction energy of the 81P 1/2 pair is negligible which explains the absence of a line broadening, while the broadening of the 81P 3/2 line is in rough quantitative agreement with the expected interaction energy.…”

Section: Interaction-induced Broadening Of Rydberg Spectrasupporting

confidence: 86%

“…One promising approach is based on the entanglement of mesoscopic Rydberg ensembles which are exposed to the dipole blockade [14], i.e. Signatures of a local blockade have recently been observed by the group of P. Gould and E. Eyler at Storrs, Connecticut, [15] and by our group [16,17]. Signatures of a local blockade have recently been observed by the group of P. Gould and E. Eyler at Storrs, Connecticut, [15] and by our group [16,17].…”

Section: Introductionmentioning

confidence: 77%

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Ultralong-Range Interactions and Blockade of Excitation in a Cold Rydberg Gas

Weidemüller¹,

Singer²,

Reetz‐Lamour³

et al. 2005

AIP Conference Proceedings

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Articles you may be interested inMagnetic-film atom chip with 10 μm period lattices of microtraps for quantum information science with Rydberg atoms Rev. Sci. Instrum. 85, 053102 (2014); Abstract. We review our recent experiments on interaction-induced effects in a gas of Rydberg atoms excited from a laser-cooled rubidium cloud. The van-der-Waals interaction between a pair of Rydberg atoms separated as far as 100,000 Bohr radii features two important effects: Spectral broadening of the resonance lines and suppression of excitation with increasing Rydberg density. The line broadenings are interpreted in terms of level shifts of Rydberg pairs due to their interaction. The density-dependent suppression of excitation marks the onset of an interaction-induced local blockade.

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Section: Interaction-induced Broadening Of Rydberg Spectrasupporting

confidence: 86%

Section: Introductionmentioning

confidence: 77%

Ultralong-Range Interactions and Blockade of Excitation in a Cold Rydberg Gas

Weidemüller¹,

Singer²,

Reetz‐Lamour³

et al. 2005

AIP Conference Proceedings

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“…Experimentally, long-range interactions of the van der * panas@th.physik.uni-frankfurt.de Waals type can be realized, e.g. by exciting atoms to high principal quantum number Rydberg states [25,26]. The advantage of this approach is that one can tune the strength of the long-range interaction through an appropriate choice of the Rydberg state.…”

Section: Introductionmentioning

confidence: 99%

Supersolid phases of Rydberg-excited bosons on a triangular lattice

et al. 2019

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Recent experiments with ultracold Rydberg-excited atoms have shown that long-range interactions can give rise to spatially ordered structures. Observation of crystalline phases in a system with Rydberg atoms loaded into an optical lattice seems also within reach. Here we investigate a bosonic model on a triangular lattice suitable for description of such experiments. Numerical simulations based on bosonic dynamical mean-field theory reveal a rich phase diagram with different supersolid phases. Comparison with the results obtained for a square lattice geometry shows qualitatively similar results in a wide range of parameters, however, on a triangular lattice we do not observe the checkerboard supersolid. Moreover, unlike on a square lattice we did not find a phase transition from uniform superfluid to supersolid induced by increase of the hopping amplitude on a triangular lattice. Based on our results we propose an intuitive interpretation of the nature of different supersolid phases. We also propose parameters for the experimental realization.

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“…After detection the MOT is turned back on and the whole cycle is repeated every 70 ms. Our setup allows to compensate electric fields E ⊥ in a direction perpendicular to the excitation lasers. Field components parallel to the field plates cannot be compensated and are determined from Stark shifts to be E =160 mV/cm [16]. The field values given in the text represent the total field E = (E 2 + E 2 ⊥ ) 1/2 .…”

mentioning

confidence: 99%

Rabi Oscillations and Excitation Trapping in the Coherent Excitation of a Mesoscopic Frozen Rydberg Gas

et al. 2008

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We demonstrate the coherent excitation of a mesoscopic ensemble of about 100 ultracold atoms to Rydberg states by driving Rabi oscillations from the atomic ground state. We employ a dedicated beam shaping and optical pumping scheme to compensate for the small transition matrix element. We study the excitation in a weakly interacting regime and in the regime of strong interactions. When increasing the interaction strength by pair state resonances we observe an increased excitation rate through coupling to high angular momentum states. This effect is in contrast to the proposed and previously observed interaction-induced suppression of excitation, the so-called dipole blockade.PACS numbers: 03.65. Yz, 32.80.Pj, 32.80.Rm, 34.20.Cf, 34.60.+z Rydberg atoms, with their rich internal structure, have been in the focus of atomic physics for more than a century [1]. In the last decade Rydberg physics were extended to laser-cooled atomic gases which allowed the study of a frozen system with controllable, strong interactions and negligible thermal contributions. This has opened a wide field in both experiment and theory covering such diverse areas as resonant energy transfer [2,3], plasma formation [4,5], exotic molecules [6,7], and quantum random walks [8,9]. In addition, these frozen Rydberg systems have been proposed as a possible candidate for quantum information processing [10,11]. However, the coherent excitation of Rydberg atoms, an important prerequisite for quantum information protocols, has proven a challenging task. While Rabi oscillations between different Rydberg states have been demonstrated and thoroughly analyzed before [12], Rabi oscillations between the ground state and Rydberg states of atoms have not been observed directly so far, mainly owing to the small transition matrix element.In this Letter we report on the experimental realization and observation of Rabi oscillations between the ground and Rydberg states of ultracold atoms. We demonstrate how strong interatomic interactions influence the coherent excitation of a mesoscopic cloud of atoms. We show that an interaction-induced coupling to a larger number of internal states can be used to trap the excitation. Employed in a controlled way, this effect offers future applications in the experimental realization of quantum random walks with exciton trapping [9].Our experiments are performed with a magneto-optical trap (MOT) of about 10 7 87 Rb atoms at densities of 10 10 cm −3 and temperatures below 100 µK. Rydberg excitation is achieved with two counterpropagating laser beams at 780 nm and 480 nm (see Fig. 1). The laser at 780 nm is collimated to a waist of 1.1 mm ensuring a constant Rabi frequency of 2π × 55 MHz over the excitation volume as determined from Autler-Townes splittings [13]. The laser at 480 nm is referenced to a temperature stabilized Zerodur-resonator and its beam is shaped with a diffractive optical element that produces a flattop beam profile which is characterized with an adapted CCD camera with a spatial resolution of 5.6 µm. The m...

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Spectroscopy of an ultracold Rydberg gas and signatures of Rydberg–Rydberg interactions

Cited by 36 publications

References 21 publications

Ultralong-Range Interactions and Blockade of Excitation in a Cold Rydberg Gas

Ultralong-Range Interactions and Blockade of Excitation in a Cold Rydberg Gas

Supersolid phases of Rydberg-excited bosons on a triangular lattice

Rabi Oscillations and Excitation Trapping in the Coherent Excitation of a Mesoscopic Frozen Rydberg Gas

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