The authors demonstrate two-photon excitation of ground state cold rubidium atoms to Rydberg states mediated by an optical nanofiber. They exploit the decay in atom cloud study excitation. excited are estimated be about 100 nm from dielectric nanofiber's surface

Abstract Novel platforms interfacing trapped cold atoms and guided light in nanoscale waveguides are a promising route to achieve regime of strong coupling between single pass, with applications quantum non-linear optics simulation. A challenge for the experimental development this emerging waveguide-QED field research is combine facilitated optical access atom transport, trapping via modes robustness inherent nanofabrication imperfections. In endeavor, here we propose interface Rubidium...

Abstract Light guided by an optical nanofibre has a very steep evanescent field gradient extending from the fibre surface. This can be exploited to drive electric quadrupole transitions in nearby quantum emitters. In this paper, we report on observation of 5S 1/2 → 4D 3/2 transition at 516.6 nm (in vacuum) laser-cooled 87 Rb atoms using only few μ W laser power propagating through embedded atom cloud. work extends range applications for nanofibres atomic physics include more fundamental...

The direct photodissociation of trapped ${^{85}\mathrm{Rb}}_{2}^{+}$ (rubidium) molecular ions by the cooling light for $^{85}\mathrm{Rb}$ magneto-optical trap (MOT) is studied, both experimentally and theoretically. Vibrationally excited ${\mathrm{Rb}}_{2}^{+}$ are created photoionization ${\mathrm{Rb}}_{2}$ molecules formed photoassociatively in Rb MOT a modified spherical Paul trap. decay rate ion signal presence measured agreement with our calculated rates observed. mechanism due to...

We investigate the electric quadrupole interaction of an alkali-metal atom with guided light in fundamental and higher-order modes a vacuum-clad ultrathin optical fiber. calculate Rabi frequency, oscillator strength, their enhancement factors. In example rubidium-87 atom, we study dependencies frequency on quantum numbers transition, mode type, phase circulation direction, propagation orientation quantization axis, position fiber radius. find that root-mean-square (rms) reduces quickly but...

The authors study theoretically a linear array of atoms with only segment excited to super-radiant mode 1D waveguide system. Under different atomic geometries, the find system can store, redirect, or behave as an resonator for light, which could be useful quantum information processing

We laser cool rubidium atoms to form a magneto-optical trap, within Fabry-Perot cavity, and demonstrate strong coupling of the cold cavity. The strength is measured using vacuum Rabi frequency splitting (VRS) transmitted, cavity-coupled light on atomic resonance. VRS for two- three-level systems atom-cavity-coupling each system determined. By allowing laser-cooled expand different times measuring corresponding VRS, we determine number overlapped with cavity mode as function time. This...

We experimentally demonstrate a one-color two-photon transition from the $5\mathit{S}_{1/2}$ ground state to $6\mathit{S}_{1/2}$ excited in rubidium (Rb) vapor using continuous wave laser at 993 nm. The Rb contains both isotopes ($^{85}$Rb and $^{87}$Rb) their natural abundances. electric dipole allowed transitions are characterized by varying power polarization of excitation laser. Since optical setup is relatively simple, energies levels impervious stray magnetic fields, this an attractive...

We demonstrate the manipulation of transmitted light through an optical Fabry-Perot cavity, built around a spectroscopy cell containing enriched rubidium vapor. Light resonant with $^{87}$Rb D$_{2}$ ($F=2/F=1$) $\leftrightarrow F'$ manifold, is controlled by transverse intersection cavity mode another beam. The transmission can be suppressed or enhanced depending on coupling atomic states due to intersecting beams. extreme manifestation control precipitious destruction (negative logic...

We propose a method to continuously frequency shift target laser that is stabilized by reference laser, which several hundreds of nanometers detuned. demonstrate the technique using 5S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1/2</sub> → 5P xmlns:xlink="http://www.w3.org/1999/xlink">3/2</sub> 29D xmlns:xlink="http://www.w3.org/1999/xlink">5/2</sub> Rydberg transition in <sup xmlns:xlink="http://www.w3.org/1999/xlink">87</sup> Rb vapor and...

Trapping cold neutral atoms in close proximity to nanostructures has raised a large interest recent years, pushing the frontiers of cavity-QED and boosting emergence waveguide-QED field research. The design efficient dipole trapping schemes evanescent fields is crucial requirement difficult task. Here we present an open-source Python package for calculating optical potentials atoms, especially vicinity nanostructures. Given distributions variety trap configurations, nanotrappy computes...

We report on an experimental test of the spin selection rule for two-photon transitions in atoms. In particular, we demonstrate that $5S_{1/2}\to 6S_{1/2}$ transition rate a rubidium gas follows quadratic dependency helicity parameter linked to polarization excitation light. For via single Gaussian beam or two counterpropagating beams hot vapor cell, scales as squared degree linear polarization. The reaches zero when light is circularly polarized. contrast, realized evanescent field near...

Coupling quantum emitters and nanostructures, in particular cold atoms optical waveguides, has recently raised a large interest due to unprecedented possibilities of engineering light-matter interactions. In this work, we propose new type periodic dielectric waveguide that provides strong interactions between guided photons with an unusual dispersion. We design asymmetric comb supports slow mode quartic (instead quadratic) dispersion electric field extends far into the air cladding for...

We propose an ion trap configuration such that individual traps can be stacked together in a three dimensional simple cubic arrangement. The isolated as well the extended array of are characterized for different locations lattice, illustrating robustness lattice concept. Ease addressing ions at each site, individually or simultaneously, makes this system naturally suitable number experiments. Application to precision spectroscopy, quantum information processing and study few particle...

The collective strong coupling of rubidium atoms in a magneto-optical trap (MOT) to the Laguerre-Gaussian (LG) modes Fabry-P\'erot cavity is investigated. Bright and dark $^{85}\mathrm{Rb}$ MOT are prepared at geometric center cavity, vacuum Rabi splitting (VRS) collectively coupled atom-cavity system measured for ${\mathrm{LG}}_{l0}$ ($l=0,1,2,3$) modes. atom number mode depends on overlap atomic density distribution specific spatial function, which reflected VRS spectrum. known function...

Novel platforms interfacing trapped cold atoms and guided light in nanoscale waveguides are a promising route to achieve regime of strong coupling between single pass, with applications quantum non-linear optics simulation. A challenge for the experimental development this emerging waveguide-QED field research is combine facilitated optical access atom transport, trapping via modes robustness inherent nanofabrication imperfections. In endeavor, here we propose interface Rubidium photonic...

Interfacing cold neutral atoms and photons guided in nanoscale waveguides has raised a large interest over the recent years, with wealth of emerging opportunities. Arrays can be trapped evanescent field modes strong transverse confinement enables to increase individual atom-photon coupling single pass. Remarkable experimental advances have been obtained optical nanofibers [1], but photonic crystals (PCW) are very promising as they allow for precise dispersion engineering. Despite these...

We present an unique experimental arrangement which permits the simultaneous trapping and cooling of ions neutral atoms, within a Fabry-Perot (FP) cavity. The versatility this hybrid trap experiment enables variety studies with trapped mixtures. motivations behind production such system are explained, followed by details how is put together. Several experiments that have been performed presented some opportunities discussed. However primary emphasis focussed on aspects pertain to ions, in system.

We discuss recent experimental progress towards realizing a quantum network based on Rydberg atoms trapped around an optical nanofiber. Initial tests are designed to demonstrate the formation of next dielectric surface.

Optical nanofibres (ONF), which are fabricated by tapering standard optical fibre over a heat source to subwavelength diameter [1], have recently come the fore as ideal tools for atom-photon hybrid quantum systems. For recent review on topic reader is referred [2]. A sub-wavelength ONF results in large portion of guided mode energy being contained within evanescent field beyond nanofibre surface. The tight confinement light provides high intensity and gradient even very low input powers....