Precision measurements of quantum defects in thenP3/2Rydberg states of85Rb

Sanguinetti, Bruno; Majeed, H. O.; Jones, Martin L.; Varcoe, Benjamin T. H.

doi:10.1088/0953-4075/42/16/165004

Cited by 33 publications

(29 citation statements)

References 28 publications

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“…The sub-MHz resolution is comparable to spectroscopy performed on an isolated single atom [49] and better than has been obtained previously in other experiments using Rydberg ensembles [54,162,168,193] which suffer from interaction-induced broadening. Rydberg EIT is thus suitable for applications in electrometry [82], and has been used to measure electric fields close to surfaces with a sensitivity of 0.1 V/cm [83].…”

Section: Low-n Eitsupporting

confidence: 62%

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Cooperative Optical Non-Linearity in a Blockaded Rydberg Ensemble

Pritchard¹

2012

Springer Theses

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This thesis describes the observation of a novel optical non-linearity mediated by the dipole-dipole interactions in a cold gas of Rydberg atoms. Electromagnetically induced transparency (EIT) is used to map the strong dipolar interactions onto an optical transition, resulting in a cooperative effect where the optical response of a single atom is modified by the surrounding atoms due to dipole blockade. This optical non-linearity is characterised as a function of probe power and density for both attractive and repulsive interactions, demonstrating a non-linear density dependence associated with cooperativity. For the case of repulsive interactions, excellent agreement is obtained at low densities between experimental data and an interacting three-atom model. The ability to tune the interactions with an external field is also verified.This cooperative effect can be used to manipulate light at the single photon level, which is relevant for applications in quantum information processing. A theoretical model is developed to show that the non-linearity can be used to obtain a highly correlated single-photon output from a coherent laser field interacting with a single blockade region. Progress towards observing this experimentally is described, including details of the construction of a new apparatus capable of confining atoms to within a blockade radius.

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Section: Low-n Eitsupporting

confidence: 62%

“…resonant energy transfer [41][42][43][44], mechanical effects of dipoledipole interactions [45,46], dipole blockade [50-56, 58, 59, 160] and formation of long-range molecules [116,167]. These ultra-cold samples are also ideal for precision measurements of quantum defects [92,93,168] and lifetimes [169,170] of the Rydberg states.…”

Section: Part IImentioning

confidence: 99%

Cooperative Optical Non-Linearity in a Blockaded Rydberg Ensemble

Pritchard¹

2012

Springer Theses

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“…Thus, at R ≈ R 0 the opposite-parity states of each atom may be mixed, creating the degenerate state with large permanent electric dipole moment similar to those produced with the use of electric and/or magnetic field [9]. Detailed analysis on the basis of the data for quantum defects of Rb Rydberg states detects the indicated type of degeneracy for 38P 3/2 , 39D 3/2 , 43D 5/2 and 58D 3/2 states [10][11][12][13][14][15][16][17][18][19]. The energy of two atoms in these states is separated from the closest dipole-coupled two-atomic levels by an energy gap δ of only few Megahertz, at least two orders smaller than the separation on the order of Gigahertz from any other state.…”

Section: Introductionmentioning

confidence: 95%

Asymptotic approximations to the energy of dispersion interaction between rubidium atoms in Rydberg states

2017

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Irreducible components determining the dependence of the van der Waals coefficient C nlJM 6 ( ) on the angle θ between the interatomic and the quantisation axes of two Rb atoms in their identical Rydberg states nlJMñ | are evaluated with account of the most contributing terms of the spectral resolution for the bi-atomic Green's function. Asymptotic polynomials in powers of the Rydberg-state principal quantum number n are derived for the C 6 irreducible components. Numerical values of the polynomial coefficients are determined for Rb atoms in their n S

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“…For lower angular momentum states this is not the case and it is necessary to model the interaction using the quantum defects. We included measured quantum defects for the s, p, d, f , and g states [38][39][40][41] and we estimated the defects for higher angular momentum states based on an ℓ −5 scaling [42]. Following the method of Zimmerman et al [15], we constructed the Hamiltonian matrix for the Rydberg electron in the fine-structure basis {j,m j }.…”

Section: Modelmentioning

confidence: 99%

Quantum interference in the field ionization of Rydberg atoms

et al. 2015

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We excite ultracold rubidium atoms in a magneto-optical trap to a coherent superposition of the three |m j | sublevels of the 37d 5/2 Rydberg state. After some delay, during which the relative phases of the superposition components can evolve, we apply an electric field pulse to ionize the Rydberg electron and send it to a detector. The electron traverses many avoided crossings in the Stark levels as it ionizes. The net effect of the transitions at these crossings is to mix the amplitudes of the initial superposition into the same final states at ionization. Similar to a Mach-Zehnder interferometer, the three initial superposition components have multiple paths by which they can arrive at ionization and, since the phases of those paths differ, we observe quantum beats as a function of the delay time between excitation and initiation of the ionization pulse. We present a fully quantum-mechanical calculation of the electron's path to ionization and the resulting interference pattern.

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Precision measurements of quantum defects in thenP_3/2Rydberg states of⁸⁵Rb

Cited by 33 publications

References 28 publications

Cooperative Optical Non-Linearity in a Blockaded Rydberg Ensemble

Cooperative Optical Non-Linearity in a Blockaded Rydberg Ensemble

Asymptotic approximations to the energy of dispersion interaction between rubidium atoms in Rydberg states

Quantum interference in the field ionization of Rydberg atoms

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