Anisotropic deformation of the Rydberg-blockade sphere in few-atom systems

Qian, Jing; Zhao, Xing-Dong; Zhou, Lu; Zhang, Weiping

doi:10.1103/physreva.88.033422

Cited by 11 publications

(6 citation statements)

References 41 publications

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“…To quantitatively estimate s, we find that the single-atom blockade radius can be roughly given by R b = (C 6 /ω) 1/6 [36]. With definitions of R and R b , we can finally arrive at a reduced form of the approximated interaction s, which is [37]…”

Section: C6mentioning

confidence: 99%

Unidirectional and controllable higher-order diffraction by a Rydberg electromagnetically induced grating

Zhao

et al. 2019

Phys. Rev. A

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A method for diffracting the weak probe beam into unidirectional and higher-order directions is proposed via a novel Rydberg electromagnetically induced grating, providing a new way for the implementations of quantum devices with cold Rydberg atoms. The proposed scheme utilizes a suitable and position-dependent adjustment to the two-photon detuning besides the modulation of the standing-wave coupling field, bringing a in-phase modulation which can change the parity of the dispersion. We observe that when the modulation amplitude is appropriate, a perfect unidirectional diffraction grating can be realized. In addition, due to the mutual effect between the van der Waals (vdWs) interaction and the atom-field interaction length that deeply improves the dispersion of the medium, the probe energy can be counter-intuitively transferred into higher-order diffractions as increasing the vdWs interaction, leading to the realization of a controllable higher-order diffraction grating via strong blockade.

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Section: C6mentioning

confidence: 99%

Unidirectional and controllable higher-order diffraction by a Rydberg electromagnetically induced grating

Zhao

et al. 2019

Phys. Rev. A

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“…Analysis of the residual double excitation probability reveals it to be higher than expected from calculated blockade strengths. This points to either an overestimation of the van der Waals strength or to a diminution of the blockade through three-body interactions [52,53]. These results underpin the notion that, in order to rely on a robust blockade mechanism in an array of Rydberg atoms, one has to carefully tune the experimental parameters when working with D states.…”

Section: Collective Rabi Oscillationsmentioning

confidence: 92%

Assembled arrays of Rydberg-interacting atoms

Schlosser

Mello

Schäffner

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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Assembled arrays of individual atoms with Rydberg-mediated interactions provide a powerful platform for the simulation of many-body spin Hamiltonians as well as the implementation of universal gate-based quantum information processing.We demonstrate the first realization of Rydberg excitations and controlled interactions in microlens-generated multisite trap arrays of reconfigurable geometry. We utilize atom-by-atom assembly for the deterministic preparation of pre-defined 2D structures of rubidium Rydberg atoms with exactly known mutual separations and selectable interaction strength. By adapting the geometry and the addressed Rydberg state, a parameter regime spanning from weak interactions to strong coupling can be accessed. We characterize the simultaneous coherent excitation of non-interacting atom clusters for the state 57D 5/2 and analyze the experimental parameters and limitations. For configurations optimized for Rydberg blockade utilizing the state 87D 5/2 , we observe collectively enhanced Rabi oscillations.

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“…[15,16] and experimentally verified by Weidemüller group in 87 Rb atoms [17], occurs when the interaction induced energetic shift can be well compensated by the laser detuning to the Rydberg level, triggering many interesting applications then. For instance it enables the implementation of an accurate one-step quantum logic gate [18] or a maximal entanglement [19,20], facilitating excitation dynamics even in thermal atoms beyond the frozen limit [21][22][23] or in anisotropic interacting systems due to partial resonance [24]. Besides, some nontrivial facilitation approaches, such as relying on inhomogeneous broadening on blue-detuned atoms with attractive interactions [25], avoided crossings between collective manybody states [26,27], or seeded avalanche dynamics in offresonant Rydberg atoms [28], have been proposed, providing more prospects for observing strongly correlated excitation growth in ultracold Rydberg gases [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Deterministic facilitated excitation of the weakly driven atom in heteronuclear Rydberg atom pairs beyond antiblockade

Wang

et al. 2019

J. Opt. Soc. Am. B

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Due to the intrinsic strong blockaded interaction shifting the energy level of Rydberg state, the steady Rydberg probability may be substantially restrained to a low level, especially for atoms suffering from weak drivings. We report an exotic excitation facilitation using strong blockaded energy shifting the double excitation state, leading to the weakly-driven atom deterministically excited by a significantly improved fraction even at far off-resonant regimes. This phenomenon is attributed to the effective induction of a reduced detuning to the weakly-driven atom by optimizing parameters of an auxiliary strongly-driven atom, arising a modified large probability preserved for a broadening range of detunings. The influence from breaking blockade condition on the excitation probability is also discussed. In contrast to previous approaches, our excitation facilitation mechanism does not rely on antiblockade effect to the compensation of Rydberg energy, serving as a fresh way to a deterministic single-atom excitation of the target atom in a pair of heteronuclear Rydberg atoms, where a strong interatomic interaction is required.

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Anisotropic deformation of the Rydberg-blockade sphere in few-atom systems

Cited by 11 publications

References 41 publications

Unidirectional and controllable higher-order diffraction by a Rydberg electromagnetically induced grating

Unidirectional and controllable higher-order diffraction by a Rydberg electromagnetically induced grating

Assembled arrays of Rydberg-interacting atoms

Deterministic facilitated excitation of the weakly driven atom in heteronuclear Rydberg atom pairs beyond antiblockade

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