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An $^{27}$Al$^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$Feb 20 2019We describe an optical atomic clock based on quantum-logic spectroscopy of the $^1$S$_0$ $\leftrightarrow$ $^3$P$_0$ transition in $^{27}$Al$^{+}$ with a systematic uncertainty of ${9.5 \times 10^{-19}}$ and a frequency stability of ${1.2\times10^{-15}/\sqrt{\tau}}$. ... More

The cross sections for inelastic neutron scattering and radiative capture in the field of a light waveFeb 20 2019The mixing of the levels of a compound nucleus in the field of a high-intensity light wave is considered. The cross sections for inelastic neutron scattering and radiative capture are computed with allowance for this effect. The effect of the electron ... More

Magnetic fields alter tunneling in strong-field ionizationFeb 19 2019When a strong laser pulse induces the ionization of an atom, momentum conservation dictates that the absorbed photons transfer their momentum $p_{\gamma}=E_{\gamma}/c$ to the electron and its parent ion. Even after 30 years of studying strong-field ionization, ... More

A functional renormalization group approach to thermodynamics of weakly interacting Bose gases: from linear to hydrodynamic fluctuationsFeb 19 2019We study weakly interacting Bose gases using the functional renormalization group with a hydrodynamic effective action. We use a scale-dependent parametrization of the boson fields developed previously that interpolates between a Cartesian representation ... More

Time gated ion microscopy of light-atom interactionsFeb 19 2019The development of ultra-short intense laser sources in the visible and extreme ultraviolet (XUV) spectral range led to fascinating studies in laser-matter interactions and attosecond science. In the majority of these studies the system under investigation ... More

Theoretical study of electron structure of superheavy elements with open $6d$-shell, Sg, Bh, Hs and MtFeb 18 2019We use recently developed efficient versions of the configuration interaction method to perform {\em ab initio} calculations of the spectra of superheavy elements seaborgium (Sg, $Z=106$), bohrium (Bh, $Z=107$), hassium (Hs, $Z=108$) and meitnerium (Mt, ... More

Magnetic Field Control of Optical Transmission and Narrow Linewidth Superradiant Lasing by Strontium AtomsFeb 18 2019We study the magnetic field controlled optical transmission observed in [Phys. Rev. Lett. 118, 263601 (2017)] with ultra-cold ${}^{88} {\rm Sr}$ atoms trapped in a one-dimensional optical lattice inside an optical cavity. We show that this phenomenon ... More

Microwave magnetic field imaging based on Rabi resonance with an alkali-atom vapor cellFeb 18 2019In this work, we demonstrate a microwave magnetic field imaging technique based on Rabi resonance with a cesium atom vapor cell. Rabi resonance signals are generated when atoms interact with a phase-modulated microwave (MW) field and are detected by a ... More

Many-body cooperative effects in an ensemble of point-like impurity centers near a charged conductive surfaceFeb 17 2019On the basis of a quantum microscopic approach we study the cooperative effects induced by the dipole-dipole interaction in an ensemble of point-like impurity centers located near a charged perfectly conducting surface. We analyze the simultaneous influence ... More

Cavity-enhanced high harmonic generation for XUV time-resolved ARPESFeb 15 2019With its direct correspondence to electronic structure, angle-resolved photoemission spectroscopy (ARPES) is a ubiquitous tool for the study of solids. When extended to the temporal domain, time-resolved (TR)-ARPES offers the potential to move beyond ... More

Molecular rotation movie filmed with high-harmonic generationFeb 15 2019Direct imaging of molecular dynamics is a long-standing goal in physics and chemistry. As an emerging tool, high-harmonic spectroscopy (HHS) enables accessing molecular dynamics on femtosecond to attosecond time scales. However, decoding information from ... More

Laser cooling of moleculesFeb 14 2019Recently, laser cooling methods have been extended from atoms to molecules. The complex rotational and vibrational energy level structure of molecules makes laser cooling difficult, but these difficulties have been overcome and molecules have now been ... More

Local spin manipulation of quantized atomic currentsFeb 14 2019Spin is a fundamental quantum property of matter, and lifting its degeneracy lies at the heart of subtle transport phenomena and future schemes for quantum information processing. Here, we implement a microscopic spin filter for cold fermionic atoms in ... More

Excitation of the $^{229}$Th nucleus via a two-photon electronic transitionFeb 14 2019We investigate the process of nuclear excitation via a two-photon electron transition (NETP) for the case of the doubly charged thorium. The theory of the NETP process has been devised originally for heavy helium like ions. In this work we study this ... More

Large-scale multilayer architecture of single-atom arrays with individual addressabilityFeb 14 2019We report on the realization of a novel platform for the creation of large-scale 3D multilayer configurations of planar arrays of individual neutral atoms: a microlens-generated Talbot optical lattice. We demonstrate the trapping and imaging of rubidium ... More

Hydrogen in a cavityFeb 14 2019The system of a proton and an electron in an inert and impenetrable spherical cavity is studied by solving Schr\"{o}dinger equation with the correct boundary conditions. The differential equation of a hydrogen atom in a cavity is derived. The numerical ... More

Characterizing Earth gravity field fluctuations with the MIGA antenna for future Gravitational Wave detectorsFeb 14 2019Fluctuations of the earth's gravity field are a major noise source for ground-based experiments investigating general relativity phenomena such as Gravitational Waves (GWs). Mass density variations caused by local seismic or atmospheric perturbations ... More

Laser cooling with adiabatic passage for diatomic moleculesFeb 14 2019We demonstrate a magnetically enhanced laser cooling scheme applicable to multi-level type-II transitions and further diatomic molecules with adiabatic transfer. An angled magnetic field is introduced to not only remix the dark states, but also decompose ... More

Phase-amplitude formalism for ultra-narrow shape resonancesFeb 13 2019We apply Milne's phase-amplitude representation [W. E. Milne, Phys. Rev. 35, 863 (1930)] to a scattering problem involving disjoint classically allowed regions separated by a barrier. Specifically, we develop a formalism employing different sets of amplitude ... More

CHIANTI - an atomic database for emission lines - Paper XV: Version 9, improvements for the X-ray satellite linesFeb 13 2019CHIANTI contains a large quantity of atomic data for the analysis of astrophysical spectra. Programs are available in IDL and Python to perform calculation of the expected emergent spectrum from these sources. The database includes atomic energy levels, ... More

Constraints on bosonic dark matter from ultralow-field nuclear magnetic resonanceFeb 12 2019The nature of dark matter, the invisible substance making up over $80\%$ of the matter in the Universe, is one of the most fundamental mysteries of modern physics. Ultralight bosons such as axions, axion-like particles or dark photons could make up most ... More

Collisions between cold molecules in a superconducting magnetic trapFeb 12 2019Collisions between cold molecules are essential for studying fundamental aspects of quantum chemistry, and may enable formation of quantum degenerate molecular matter by evaporative cooling. However, collisions between trapped, naturally occurring molecules ... More

Determination of quantum defect for the Rydberg P series of Ca IIFeb 12 2019We present an experimental investigation of the Rydberg 23P$_{1/2}$ state of laser-cooled $^{40}$Ca$^+$ ions in a radiofrequency ion trap. Using micromotion sideband spectroscopy techniques on a narrow quadrupole transition, the oscillating electric field ... More

Comparison of three approaches to light scattering by dilute cold atomic ensemblesFeb 12 2019Collective effects in atom-light interaction is of great importance for cold-atom-based quantum devices or fundamental studies on light transport in complex media. Here we discuss and compare three different approaches to light scattering by dilute cold ... More

Twin-beam-enhanced displacement measurement of a membrane in a cavityFeb 12 2019Ultrasensitive measurement of a small displacement is an essential goal in various applications of science and technology, ranging from large-scale laser interferometric gravitational wave detectors to micro-electro-mechanical-systems-based force microscopy. ... More

Preparation of a Hetero-nuclear Two-atom System in the 3D Motional Ground State in an Optical TweezerFeb 12 2019We report the realization of a heteronuclear two-atom of $^{87}$Rb-$^{85}$Rb in the ground state of an optical tweezer (OT). Starting by trapping two different isotopic single atoms, a $^{87}$Rb and a $^{85}$Rb in two strongly focused and linearly polarized ... More

Investigation of robust population transfer using quadratically chirped laser interacting with two-level systemFeb 12 2019We have proposed and demonstrated a fast and robust method of population transfer between two quantum states using a quadratically chirped laser source. Incorporating the Jaynes-Cummings in a full quantum description of the interaction, and numerically ... More

Scrambling and Complexity in Phase SpaceFeb 11 2019The study of information scrambling in many-body systems has sharpened our understanding of quantum chaos, complexity and gravity. Here, we extend the framework for exploring information scrambling to infinite dimensional continuous variable (CV) systems. ... More

Ground State Cooling and Transport of Single Atoms for Ultracold Molecular AssemblyFeb 11 2019We demonstrate full quantum state control of two species of single atoms using optical tweezers. Our demonstration includes 3D ground-state cooling of a single atom (Cs) in an optical tweezer, transport by several microns with minimal heating, and merge ... More

Maltese cross coupling to cold atoms in free spaceFeb 08 2019We demonstrate a novel geometry for strong coupling of light and matter in free space, i.e., without the use of optical cavities. Guided by optical metrology tools, we use a manual pick-and-place technique to precisely and stably position four high numerical ... More

Cesium bright matter-wave solitons and soliton trainsFeb 08 2019A setup for studying bright matter-wave solitons of a cesium Bose-Einstein condensate (BEC) is presented. Production of a single soliton is demonstrated and dependence of soliton atom number on the interatomic interaction is studied. Formation of soliton ... More

Dressed dense atomic gasesFeb 08 2019In dense atomic gases the interaction between transition dipoles and photons leads to the formation of many-body states with collective dissipation and long-ranged forces. Despite decades of research, a full understanding of this paradigmatic many-body ... More

Opto-mechanical resonator-enhanced atom interferometryFeb 07 2019We combine an optical-mechanical resonator with an atom interferometer. A classical cantilever and matter waves sense their acceleration with respect to a joint reference. Apart from research on macroscopic opto-mechanical quantum objects, applications ... More

A new measurement of the permanent electric dipole moment of $^{129}$Xe using $^{3}$He comagnetometry and SQUID detectionFeb 07 2019We describe a new technique to measure the EDM of $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred to a measurement cell, and transported into a magnetically shielded room, where SQUID ... More

Discerning quantum memories based on electromagnetically-induced-transparency and Autler-Townes-splitting protocolsFeb 07 2019Electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) are similar,but different quantum optical phenomena: EIT results from a Fano interference, whereas ATS is described by the AC-Stark effect. Likewise, despite their close ... More

Constraining Rapidly Oscillating Scalar Dark Matter Using Dynamic DecouplingFeb 07 2019We propose and experimentally demonstrate a method for detection of light scalar Dark Matter (DM), through probing temporal oscillations of fundamental constants in an atomic optical transition. Utilizing the quantum information notion of Dynamic Decoupling ... More

Optical clock intercomparison with $6\times 10^{-19}$ precision in one hourFeb 07 2019Improvements in atom-light coherence are foundational to progress in quantum information science, quantum optics, and precision metrology. Optical atomic clocks require local oscillators with exceptional optical coherence due to the challenge of performing ... More

Measuring magnetic fields with magnetic field insensitive transitionsFeb 06 2019Magnetometry is an important tool prevalent in many applications such as fundamental research, material characterization and biological imaging. Atomic magnetometry conventionally makes use of two quantum states, the energy difference of which depends ... More

Relativistic Impulse Approximation in Compton ScatteringFeb 06 2019We apply the relativistic impulse approximation to Compton scattering of atomic systems described using Dirac-Fock wavefunctions. An "exact" numerical treatment is employed in the integration, and calculations of C, Cu, Ge, and Xe atoms have been carried ... More

Rydberg state ionization dynamics and tunnel ionization rates in strong electric fieldsFeb 06 2019Tunnel ionization rates of triplet Rydberg states in helium with principal quantum numbers close to 37 have been measured in electric fields at the classical ionization threshold of $\sim197$ V/cm. The measurements were performed in the time domain by ... More

Modeling atom-atom interactions at low energy by Jost-Kohn potentialsFeb 06 2019It is well-known that the zero-range contact potential approximation for the mean-field interaction of a many-atom system breaks down when the atoms interact through a scattering resonance. At present, there exists no standard model interaction potential ... More

Modeling atom-atom interactions at low energy by Jost-Kohn potentialsFeb 06 2019Feb 08 2019It is well-known that the zero-range contact potential approximation for the mean-field interaction of a many-atom system breaks down when the atoms interact through a scattering resonance. At present, there exists no standard model interaction potential ... More

Characterizing dissociative motion in time-resolved x-ray scattering from gas-phase diatomic moleculesFeb 05 2019Time-resolved x-ray scattering (TRXS) measures internuclear separations in a molecule following laser-induced photoexcitation. The molecular dynamics induced by the excitation laser may lie on one or several bound or dissociative electronic states. TRXS ... More

Microwave Rabi resonances beyond the small-signal regimeFeb 05 2019The coupling between microwave fields and atoms (or atom-like systems) is inherently weaker than for optical fields, making microwave signal manipulation for applications like quantum information processing technically challenging. In order to better ... More

Inclusion of Coulomb effects in laser-atom interactionsFeb 05 2019We investigate the role of the Coulomb interaction in strong field processes. We find that the Coulomb field of the ion makes its presence known even in highly intense laser fields, in contrast to the assumptions of the strong field approximation. The ... More

EBIT Observation of Ar Dielectronic Recombination Lines Near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy ClustersFeb 04 2019Motivated by possible atomic origins of the unidentified emission line detected at 3.55 keV to 3.57 keV in a stacked spectrum of galaxy clusters (Bulbul et al. 2014), an electron beam ion trap (EBIT) was used to investigate the resonant dielectronic recombination ... More

Laser refrigeration using exciplex resonances in gas filled hollow-core fibresFeb 04 2019We theoretically study prospects and limitations of a new route towards macroscopic scale laser refrigeration based on exciplex-mediated frequency up-conversion in gas filled hollow-core fibres. Using proven quantum optical rate equations we model the ... More

Proper time in atom interferometers: Diffractive versus specular mirrorsFeb 04 2019We compare a conventional Mach-Zehnder light-pulse atom interferometer based on diffractive mirrors with one that uses specular reflection. In contrast to diffractive mirrors that generate a symmetric configuration, specular mirrors realized, for example, ... More

Compensation of the trap-induced quadrupole interaction in trapped Rydberg ionsFeb 04 2019The quadrupole interaction between the Rydberg electronic states of a Rydberg ion and the radio frequency electric field of the ion trap is analyzed. Such a coupling is negligible for the lowest energy levels of a trapped ion but it is important for a ... More

An Optical Tweezer Array of Ultracold MoleculesFeb 01 2019Arrays of single ultracold molecules promise to be a powerful platform for many applications ranging from quantum simulation to precision measurement. Here we report on the creation of an optical tweezer array of single ultracold CaF molecules. By utilizing ... More

Laser-Assisted Self-Induced Feshbach resonance for ultracold polar molecule formationFeb 01 2019We propose a new type of Feshbach resonance occurring when two different ultracold atoms in their ground state undergo an s-wave collision in the presence of a continuous-wave laser light. The atoms collide in the dissociation continuum of the molecular ... More

Determining temperature and Rabi frequency regarding trapped ions in Doppler cooling: An analytic investigationFeb 01 2019Doppler cooling with lasers is essential to ions' trapping and also a preliminary step towards achievement of ultracold ions. Due to lack of effective tools, experimentally monitoring the ions' temperature and the laser-ion coupling is difficult in Doppler ... More

Defect-free assembly of 2D clusters of more than 100 single-atom quantum systemsFeb 01 2019Feb 05 2019We demonstrate the defect-free assembly of versatile target patterns of up 111 neutral atoms, building on a 361-site subset of a micro-optical architecture that readily provides thousands of sites for single-atom quantum systems. By performing up to 80 ... More

Peculiarities of Wigner times delay in slow elastic electron scattering by potential well with arising discrete levelsFeb 01 2019Feb 04 2019We generalize here the one-level consideration in our recent paper arXiv:1901.00411 [1] to the case when an electron collides with a potential that have any number of s bound states. We investigate peculiarities in the Wigner time delay behavior for slow ... More

Randomness expansion secured by quantum contextualityFeb 01 2019The output randomness from a random number generator can be certified by observing the violation of quantum contextuality inequalities based on the Kochen-Specker theorem. Contextuality can be tested in a single quantum system, which significantly simplifies ... More

Random to chaotic temperature transition in low-field Fano-Feshbach resonances of cold thulium atomsFeb 01 2019Here, we report on the observation of a random to chaotic temperature transition in the spacing of Fano-Feshbach resonances in the ultracold polarized gas of thulium atoms. This transition is due to the appearance of so-called d-resonances, which are ... More

New limit on an exotic parity-odd spin- and velocity-dependent interaction using an optically polarized vaporJan 31 2019Exotic spin-dependent interactions between fermions have recently attracted attention in relation to theories beyond the Standard Model of particle physics. The exotic interactions can be mediated by new fundamental spin-0 or spin-1 bosons which may explain ... More

The Frozen Core Approximation and Nuclear Screening Effects in Single Electron Capture CollisionsJan 31 2019Fully Differential Cross Sections (FDCS) for single electron capture from helium by heavy ion impact are calculated using a frozen core 3-Body model and an active electron 4-Body model within the first Born approximation. FDCS are presented for H+, He2+, ... More

Multi-functional surface ion trap for effective cooling and large-scale trapping of ionsJan 31 2019Scaling up the number of trapped ions and effective cooling ions in surface ion traps is a central challenge in the research of trapped-ion systems. In this paper, we propose a novel surface ion trap design that enables innate principle-axes rotation ... More

Stark spectroscopy of Rydberg atoms in an atom-ion hybrid trapJan 30 2019We report on Rydberg spectroscopy of ultracold atoms in an atom-ion hybrid trap for probing the electric fields in a mixture of atoms and ions. We obtain spectra which exhibit excitation gaps corresponding to avoided level crossings in the Stark map. ... More

Asymptotic and interpolation series for the Coulomb three-body systems with unit chargesJan 30 2019Accurate mass-interpolation and mass-asymptotic formulas are derived for one- and two-center three-body ions with unit charges. The derived formulas are applied to predict accurate numerical values of the total energies of the ground (bound) $1^{1}S(L ... More

Zero-energy proton dissociation of H$_2^+$ through stimulated Raman scatteringJan 30 2019We show that (near-)zero energy proton emission from H$_2^+$ in strong two-color and broadband laser fields is dominated by a stimulated Raman scattering process taking place on the electronic ground state. It is furthermore shown that in the (near-)zero ... More

Spectral caustic in two-color high harmonic generation: role of Coulomb effectsJan 29 2019The high-order harmonic spectrum generated in two-color intense laser field under certain conditions has a pronounced maximum caused by the so called spectral caustic. Using a numerical solution of the 3D time-dependent Schr\"odinger equation we study ... More

Near-Unitary Spin Squeezing in 171YbJan 29 2019Feb 01 2019We report nearly unitary spin squeezing between the magnetic sublevels of the ground state of $^{171}$Yb, an atom with an optical clock transition. The collective spin of ${\sim}10^3$ atoms inside a cavity is squeezed using light detuned from the system's ... More

Electron correlations in the antiproton energy loss distribution in HeJan 29 2019We present ab-initio calculations of the electronic differential energy transfer (DET) cross-sections for antiprotons with energies between $3$keV and $1$MeV interacting with helium. By comparison with simulations employing the mean-field description ... More

Measurement of $7p\ ^2P_{1/2}^o$ branching fractions with laser-cooled $^{226}\mathrm{Ra}^+$Jan 28 2019The unstable radium nucleus is appealing for probing new physics due to its high mass, octupole deformation and energy level structure. Ion traps, with long hold times and low particle numbers, are excellent for work with radioactive species, such as ... More

Measurement of ultra-low heating rates of a single antiproton in a cryogenic Penning trapJan 28 2019We report on the first detailed study of motional heating in a cryogenic Penning trap using a single antiproton. Employing the continuous Stern-Gerlach effect we observe cyclotron quantum transition rates of 6(1) quanta/h and an electric field noise spectral ... More

Atomic H over plane: effective potential and level reconstructionJan 27 2019The behavior of atomic H in a semi-bounded space $z \geq 0$ with the condition of "not going through" the boundary (the surface $z=0$) for the electronic wavefunction (WF) is considered. It is shown that in a wide range of "not going through" condition ... More

Dark resonance formation with magnetically-induced transitions: extension of spectral range and giant circular dichroismJan 26 2019Dark resonances were formed via electromagnetically induced transparency for the first time involving magnetically-induced $\Delta F = \pm2$ atomic transitions of alkali metal atom, which are forbidden at zero magnetic field. The probability of these ... More

A magneto-optic trap using a reversible, solid-state alkali-metal sourceJan 26 2019We demonstrate a novel way to form and deplete a vapor-cell magneto-optic trap (MOT) using a reversible, solid-state alkali-metal source (AMS) via an applied polarized voltage. Using ~100 mW of electrical power, a trapped-atom number of 5x10^6 has been ... More

Heisenberg-Scaling Measurement Protocol for Analytic Functions with Quantum Sensor NetworksJan 25 2019We generalize past work on quantum sensor networks to show that, for $d$ input parameters, entanglement can yield a factor $\mathcal O(d)$ improvement in mean squared error when estimating an analytic function of these parameters. We show that the protocol ... More

Observation of spin-structure of ultralong-range Rydberg moleculesJan 25 2019We present an experimental and theoretical study of spin coupling effects in a complex Rydberg molecular energy level structure. Specifically, we explore $^{87}$Rb$_2$ bound states below the $16P_{3/2}+5S_{1/2}$ dissociation threshold. The given complexity ... More

Compact bulk-machined electromagnets for quantum gas experimentsJan 25 2019We present an electromagnet combining a large number of windings in a constrained volume with efficient cooling. It is based on bulk copper where a small pitch spiral is cut out and impregnated with epoxy, forming an ensemble which is then machined at ... More

Controlling cold atom-ion collisions using a Rydberg stateJan 25 2019We present a method to control the cold collision between an ultracold atom and a trapped ion. A laser is used to excite the ground state atom to a repulsive Rydberg potential level at a certain atom-ion distance. In this way the ion is effectively surrounded ... More

Uncertainties on atomic data. A case study: N IVJan 24 2019We consider three recent large-scale calculations for the radiative and electron-impact excitation data of N IV, carried out with different methods and codes. The scattering calculations employed the relativistic Dirac $R$-matrix (DARC) method, the intermediate ... More

Broadband lasers for photo-ionization and repumping of trapped ionsJan 24 2019A frequency-stable, broadband laser is presented for experiments on trapped ions. Since the design is based on widely available semiconductor optical amplifier technology, similar lasers can be realized for virtually any wavelength in the near-infrared, ... More

Coherent and dissipative dynamics of entangled few-body systems of Rydberg atomsJan 24 2019Feb 07 2019Experimentally observed quantum few-body dynamics of neutral atoms excited to a Rydberg state are numerically analyzed with Lindblad master equation formalism. For this, up to five rubidium atoms are trapped with optical tweezers, arranged in various ... More

Transient supersolid properties in an array of dipolar quantum dropletsJan 23 2019We study theoretically and experimentally the emergence of supersolid properties in a dipolar Bose-Einstein condensate. The theory reveals a ground state phase diagram with three distinct regimes - a regular Bose-Einstein condensate, incoherent and coherent ... More

Quantum state tomography across the exceptional point in a single dissipative qubitJan 23 2019Open systems with gain and loss, described by non-Hermitian Hamiltonians, have been a subject of intense research recently. In classical systems, the effect of exceptional-point degeneracies on their dynamics has been observed through remarkable phenomena ... More

The interplay between thermal Rydberg gases and plasmasJan 23 2019We investigate the phenomenon of bistability in a thermal gas of cesium atoms excited to Rydberg states. We present both measurements and a numerical model of the phenomena based on collisions. By directly measuring the plasma frequency, we show that ... More

Mollow triplet in cold atomsJan 23 2019In this paper, we measure the spectrum of light scattered by a cold atomic cloud driven by a strong laser beam. The experimental technique is based on heterodyne spectroscopy coupled to single-photon detectors and intensity correlations. At resonance, ... More

Sub-nanometer optical linewidth of thulium atoms in rare gas crystalsJan 22 2019We investigate the 1140 nm magnetic dipole transition of thulium atoms trapped in solid argon and neon. These solids can be straightforwardly grown on any substrate at cryogenic temperatures, making them prime targets for surface sensing applications. ... More

Time-reversed and coherently-enhanced memory: A single-mode quantum atom-optic memory without a cavityJan 22 2019The efficiency of an ensemble-based optical quantum memory depends critically on the strength of the atom-light coupling. An optical cavity is an effective method to enhance atom-light coupling strength, with the drawback that cavities can be difficult ... More

Implementing the three-particle quantization condition including higher partial wavesJan 21 2019We present an implementation of the relativistic three-particle quantization condition including both $s$- and d-wave two-particle channels. For this, we develop a systematic expansion about threshold of the three-particle divergence-free K matrix, $\mathcal{K}_{\mathrm{df,3}}$, ... More

Attoclock revisited on electron tunnelling timeJan 21 2019The last decade has seen an intense renewed debate on tunnelling time, both from a theoretical and an experimental perspective. Here, we review recent developments and new insights in the field of strong-field tunnel ionization related to tunnelling time, ... More

The $g$ factor of bound electrons as a test for physics beyond the Standard ModelJan 21 2019The use of high-precision measurements of the $g$ factor of few-electron ions and its isotope shifts is put forward as a probe for physics beyond the Standard Model. The contribution of a hypothetical fifth fundamental force to the $g$ factor is calculated ... More

Bayesian Analysis of Femtosecond Pump-Probe Photoelectron-Photoion Coincidence Spectra with Fluctuating Laser IntensitiesJan 21 2019This paper employs Bayesian probability theory for analyzing data generated in femtosecond pump-probe photoelectron-photoion coincidence (PEPICO) experiments. These experiments allow investigating ultrafast dynamical processes in photoexcited molecules. ... More

Analytic Evaluation of two-electron Atomic Integrals involving Extended Hylleraas-CI functions with STO basisJan 20 2019Some typical overlap/potential energy integrals which occur in the use of extended Hylleraas-configuration interaction (E-Hy-CI) functions with Slater-type orbital (STO) basis for two-electron atomic structure calculations, have been evaluated analytically. ... More

Improved estimate of the collisional frequency shift in Al$^+$ optical clocksJan 19 2019Collisions between background gas particles and the trapped ion in an atomic clock can subtly shift the frequency of the clock transition. The uncertainty in the correction for this effect makes a significant contribution to the total systematic uncertainty ... More

Classical versus quantum views of intense laser pulse propagation in gasesJan 18 2019We study the behavior of reduced models for the propagation of intense laser pulses in atomic gases. The models we consider incorporate ionization, blueshifting, and other nonlinear propagation effects in an ab initio manner, by explicitly taking into ... More

Nuclear Charge Radii of $^{10,11}$BJan 18 2019The first determination of the nuclear charge radius by laser spectroscopy for a five-electron system is reported. This is achieved by combining high-accuracy ab initio mass-shift calculations and a high-resolution measurement of the isotope shift in ... More

Sensing magnetic fields with non-gaussian quantum fluctuationsJan 18 2019The precision of a quantum sensor can overcome its classical counterpart when its constituants are entangled. In gaussian squeezed states, quantum correlations lead to a reduction of the quantum projection noise below the shot noise limit. However, the ... More

Using nonequilibrium thermodynamics to optimize the cooling of a dilute atomic gasJan 18 2019Optimizing thermodynamic processes far from equilibrium is a challenge. We report the experimental optimization of cooling and thermalization of a gas of few noninteracting Cesium atoms confined in a nonharmonic optical dipole trap. To this end, we combine ... More

Quasi-1D ultracold rigid-rotor collisions : reactive and non-reactive casesJan 18 2019We study polar alkali dimer scattering in a quasi-1D geometry for both reactive and non-reactive species. Elastic and reactive rates are computed as a function of the amplitude of a static electric field within a purely long-range model with suitable ... More

Visible and Ultraviolet Laser Spectroscopy of ThFJan 18 2019The molecular ion ThF$^+$ is the species to be used in the next generation of search for the electron's Electric Dipole Moment (eEDM) at JILA. The measurement requires creating molecular ions in the eEDM sensitive state, the rovibronic ground state $^3\Delta_1$, ... More

Electron correlation and Breit interaction effects on the one- and two-electron one-photon transitions in double K hole states of He-like ions($10\!\leq\!Z\!\leq\!47$)Jan 17 2019The x-ray energies and transition rates of single and double electron radiative transitions from double K hole state $2s2p$ to $1s2s$ and $1s^{2}$ configuration of 11 He-like ions ($10\!\leq\!Z\!\leq\!47$) are evaluated using fully relativistic multi-configuration ... More

Single-shot Non-destructive Detection of Rydberg Atom Ensembles by Transmission Measurement of a Microwave CavityJan 17 2019Rydberg atoms are at the core of an increasing number of experiments, which frequently rely on destructive detection methods, such as field ionization. Here, we present an experimental realization of single-shot non-destructive detection of ensembles ... More

Coulomb anti-blockade in a Rydberg dressed gasJan 16 2019We perform a comprehensive investigation of the coupling between a Rydberg-dressed atomic gas and an ultra-cold plasma. Using simultaneous time-resolved measurements of both neutral atoms and ions, we show that plasma formation occurs via a Coulomb anti-blockade ... More

Dynamical Multielectron Correlation in High-Harmonic GenerationJan 16 2019We theoretically investigate multielectron correlation in high-harmonic generation (HHG), using full-dimensional \emph{ab initio} all-electron calculations of alkali atoms. The correlation effects manifest themselves as a resonance peak and a double-plateau ... More

A Dynamic 'Double Slit' Experiment in a Single AtomJan 15 2019A single-atom 'double-slit' experiment is realized by photo-ionizing Rubidium atoms using two independent low power lasers. The photoelectron wave of well-defined energy recedes to the continuum either from the 5P or 6P states in the same atom, resulting ... More