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Precision measurement of atomic isotope shifts using a two-isotope entangled stateJun 13 2019Atomic isotope shifts (ISs) are the isotope-dependent energy differences in the atomic electron energy levels. These shifts serve an important role in atomic and nuclear physics, and particularly in the latter as signatures of nuclear structure. Recently ... More

In-situ Raman gain between hyperfine ground states in a potassium magneto-optical trapJun 13 2019We study optical gain in a gas of cold 39K atoms. The gain is observed during operation of a conventional magneto-optical trap without the need for additional fields. Measurements of transmission spectra from a weak probe show that the gain is due to ... More

Cooperative spontaneous emission via renormalization approach: Classical versus semi-classical effectsJun 13 2019We address the many-atom emission of a dilute cloud of two-level atoms through a renormalized perturbation theory. An analytical solution for the truncated coupled-dipole equations is derived, which contains an effective spectrum associated to the initial ... More

Microwave trap for atoms and moleculesJun 12 2019We demonstrate a trap that confines polarizable particles around the antinode of a standing-wave microwave field. The trap relies only on the polarizability of the particles far from any resonances, so can trap a wide variety of atoms and molecules in ... More

Perfect control of photoelectron anisotropy for randomly oriented ensembles of molecules by XUV REMPI and polarization shapingJun 12 2019We report two schemes to generate perfect anisotropy in the photoelectron angular distribution of a randomly oriented ensemble of polyatomic molecules. In order to exert full control over the anisotropy of photoelectron emission, we exploit interferences ... More

Observation of a large, resonant, cross-Kerr nonlinearity in a free-space Rydberg mediumJun 12 2019We report the experimental observation of a cross-Kerr nonlinearity in a free-space medium based on resonantly-excited, interacting Rydberg atoms and electromagnetically induced transparency. The nonlinearity is used to implement cross-phase modulation ... More

Final result of CUPID-0 phase-I in the search for the $^{82}$Se Neutrinoless Double Beta DecayJun 12 2019CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay (0$\nu$DBD) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking ... More

Phase-Noise and Amplitude-Noise Measurement of DACs and DDSsJun 12 2019This article proposes a method for the measurement of Phase Noise (PN, or PM noise) and Amplitude Noise (AN, or AM noise) of Digital-to-Analog Converters (DAC) and Direct Digital Synthesizers (DDS) based on modulation-index amplification. The carrier ... More

Transfer matrix theory of surface spin echo experiments with moleculesJun 11 2019${}^3$He spin-echo experiments have been used to study surface morphology, molecular and atomic surface diffusion, phonon dispersions, phason dispersions and even phase transitions of ionic liquids. However, the interactions between ${}^3$He atoms and ... More

Set-up for multi coincidence experiments of EUV to VIS photons and charged particles -- the solid angle maximization approachJun 11 2019The coincident detection of particles is a powerful method in experimental physics, enabling the investigation of a variety of projectile-target interactions. The vast majority of coincidence experiments is performed with charged particles, as they can ... More

The low-energy Goldstone mode in a trapped dipolar supersolidJun 11 2019A supersolid is a counter-intuitive state of matter that combines the frictionless flow of a superfluid with the crystal-like periodic density modulation of a solid. Since the first prediction in the 1950s, experimental efforts to realize this state have ... More

Establishing a relativistic model for atomic gravimetersJun 11 2019This work establishes a high-precision relativistic theoretical model: start from studying finite speed of light effect based on a coordinate transformation, and further extend the research methods to analyze the overall relativistic effects. This model ... More

Part-per-billion measurement of the $4^2S_{1/2} \rightarrow 3^2D_{5/2}$ electric quadrupole transition isotope shifts between $^{42,44,48}$Ca$^+$ and $^{40}$Ca$^+$Jun 10 2019We report a precise measurement of the isotope shifts in the $4^2$S$_{1/2} \rightarrow 3^2$D$_{5/2}$ electric quadrupole transition at 729~nm in the $^{40 - 42,44,48}$Ca$^+$. The measurement has been made via high-resolution laser spectroscopy of co-trapped ... More

Single-photon interferometry and spectroscopy with two laser frequency combsJun 09 2019We demonstrate single-photon time-domain interference in a new realm. We observe interferences in the photon counting statistics with two separate mode-locked femtosecond lasers of slightly different repetition frequencies, each emitting a comb of evenly ... More

Simultaneous retrodiction of multi-mode optomechanical systems using matched filtersJun 08 2019Generation and manipulation of many-body entangled states is of considerable interest, for use in quantum simulation and information processing. Measurement and verification of the resulting many-body state presents a formidable challenge, however, which ... More

Cold, dense atomic ion clouds produced by cryogenic buffer gas coolingJun 08 2019We produce cold and dense clouds of atomic ions (Ca$^+$, Dy$^+$) by laser ablation of metal targets and cryogenic buffer gas cooling of the resulting plasma. We measure the temperature and density of the ion clouds using laser absorption spectroscopy. ... More

Robust Strategies for Affirming Kramers-Henneberger AtomsJun 08 2019Atoms exposed to high-frequency strong laser fields experience the ionization suppression due to the deformation of Kramers-Henneberger (KH) wave functions, which has not been confirmed yet in experiment. We propose a bichromatic pump-probe strategy to ... More

Spin-alignment noise in atomic vaporJun 07 2019In the conventional spin noise spectroscopy, the probe laser light monitors fluctuations of the spin orientation of a paramagnet revealed as fluctuations of its gyrotropy, i.e., circular birefringence. For spins larger than 1/2, there exists spin arrangement ... More

Zeeman-tunable Modulation Transfer SpectroscopyJun 07 2019Active frequency stabilization of a laser to an atomic or molecular resonance underpins many modern-day AMO physics experiments. With a flat background and high signal-to-noise ratio, modulation transfer spectroscopy (MTS) offers an accurate and stable ... More

Dicke subradiance and thermal decoherenceJun 07 2019Subradiance is the cooperative inhibition of the radiation by several emitters coupled to the same electromagnetic modes. It has been predicted by Dicke in 1954 and only recently observed in cold atomic vapors. Here we address the question to what extend ... More

Optical waveguiding by atomic entanglement in multilevel atom arraysJun 05 2019The optical properties of sub-wavelength arrays of atoms or other quantum emitters have attracted significant interest recently. For example, the strong constructive or destructive interference of emitted light enables arrays to function as nearly perfect ... More

The Momentum Representation of the Hydrogen Atom in Paraboloidal CoordinatesJun 05 2019We examine the procedure to construct the variables of use for the momentum representation in quantum mechanics. The momentum variables must be chosen properly conjugate to the corresponding position space variables, such that valid uncertainty relationships ... More

Multipolar and higher-order lattice shifts in the Sr and Mg clocksJun 05 2019The progress in optical clock with uncertainty at a level of $10^{-18}$ requires unprecedented precision in estimating the contribution of multipolar and higher-order effects of atom-field interactions. Previous theoretical and experimental results of ... More

Multimode collective scattering of light in free space by a cold atomic gasJun 05 2019We have studied collective recoil lasing by a cold atomic gas, scattering photons from an incident laser into many radiation modes in free space. The model consists of a system of classical equations for the atomic motion of N atoms, where the radiation ... More

Transition Probabilities in the Two-Level System with PT-Symmetric Non-Hermitian HamiltoniansJun 04 2019In this work, we investigate how to define in a consistent way the probabilities of the transitions between the "flavor" states of the two-level quantum system, which is described by a non-Hermitian but parity and time-reversal (PT) symmetric Hamiltonian. ... More

Field ionization rate for PIC codesJun 04 2019An improved formula is proposed for field ionization rate covering tunnel and barrier suppression regime. In contrast to the previous formula obtained recently in [I. Yu. Kostyukov and A. A. Golovanov, Phys. Rev. A 98, 043407 (2018)], it more accurately ... More

$g$-factor of Boronlike Argon $^{40}\textrm{Ar}^{13+}$Jun 03 2019We have measured the ground-state $g$-factor of boronlike argon $^{40}\textrm{Ar}^{13+}$ with a fractional uncertainty of \SI{1.4e-9}{} with a single ion in the newly developed ALPHATRAP double Penning-trap setup. The here obtained value of $g=0.663\,648\,455\,32(93)$ ... More

Single-atom quantum probes for ultracold gases using nonequilibrium spin dynamicsJun 03 2019Quantum probes are atomic-sized devices mapping information of their environment to quantum mechanical states. By improving measurements and at the same time minimizing perturbation of the environment, they form a central asset for quantum technologies. ... More

Electron Correlation in the Lanthanides: $4f^2$ spectrum of Ce$^{2+}$Jun 03 2019Atoms and ions of Lanthanides have multiple opens shells along with an open $4f^k$ subshell. This paper studies the effect of electron correlation in such systems and how wave functions can be determined for the accurate prediction of atomic properties ... More

Dispersive readout of a weakly coupled qubit via the parity-time-symmetric phase transitionJun 03 2019For some cavity-quantum-electrodynamics systems, such as a single electron spin coupled to a passive cavity, it is challenging to reach the strong-coupling regime. In such a weak-coupling regime, the conventional dispersive readout technique cannot be ... More

Photoinduced Anomalous Coulomb Blockade and the Role of Triplet States in Electron Transport through an Irradiated Molecular Transistor II: Effects of Electron-Phonon Coupling and Vibrational RelaxationJun 03 2019We generalize our previous theory [Nano Lett. \textbf{18}, 5015-5023 (2018)] to investigate the influence of electron-phonon (e-p) coupling and vibrational relaxation on photoinduced \textit{anomalous Coulomb blockade}, which originates from the triplet ... More

$δ$-Quench measurement of quantum wavefunctionJun 02 2019Measurement of quantum state wavefunction not only acts as a fundamental part in quantum physics but also plays an important role in developing practical quantum technologies. Conventional quantum state tomography has been widely used to estimate quantum ... More

Electron affinities of At and its homologous elements Cl, Br, and IJun 01 2019The multiconfiguration Dirac-Hartree-Fock method is applied to study the electron affinities of At and its homologous elements Cl, Br, and I. Our method of calculation is validated through the comparison with the available experimental electron affinities ... More

Breit and QED effects on the 3d9 2D3/2 - 2D5/2 transition energy in Co-like ionsJun 01 2019The multiconfiguration Dirac-Hartree-Fock theory is used to calculate the 3d9 2D3/2 - 2D5/2 transition energy for Co-like ions with Z = 28-100. We investigate how electron correlation, frequency-independent and -dependent Breit interactions, as well as ... More

\emph{Ab initio} theory of nitrogen-vacancy center in diamondMay 31 2019Nitrogen-vacancy center in diamond is a solid state defect qubit with favorable coherence time up to room temperature which could be harnessed in several quantum enhanced sensor and quantum communication applications. The quantum control largely depends ... More

Stochastic amplitude fluctuations of bosonic dark matter and revised constraints on linear couplingsMay 31 2019Jun 04 2019If the dark matter is composed of virialized particles with mass $\lesssim 10$ eV, it is well described as a classical bosonic field. This field is stochastic in nature, where the field oscillation amplitude fluctuates following a Rayleigh distribution. ... More

Stochastic amplitude fluctuations of bosonic dark matter and revised constraints on linear couplingsMay 31 2019If the dark matter is composed of virialized particles with mass $\lesssim 10$ eV, it is well described as a classical bosonic field. This field is stochastic in nature, where the field oscillation amplitude fluctuates following a Rayleigh distribution. ... More

Holographic interference in atomic photoionization from a semiclassical standpointMay 31 2019A theoretical study of the interference pattern imprinted on the doubly differential momentum distribution of the photoelectron due to atomic ionization induced by a short laser pulse is developed from a semiclassical standpoint. We use the semiclassical ... More

Thermal QED theory for bound statesMay 31 2019In present paper the Quantum Electrodynamics theory at finite temperatures for the bound states is presented. To describe the thermal effects arising in a heat bath the Hadamard form of thermal photon propagator is employed. This form permits the simple ... More

Coulomb-induced ionization time lag after electrons tunnel out of a barrierMay 31 2019After electrons tunnel out of a laser-Coulomb-formed barrier, %formed by the strong laser field and the atomic Coulomb potential, the movement of the tunneling electron can be affected by the Coulomb tail. We show that this Coulomb effect induces a large ... More

Realization of phase locking in good-bad-cavity active optical clockMay 31 2019The residual cavity-pulling effect limits further narrowing of linewidth in dual-wavelength (DW) good-bad-cavity active optical clocks (AOCs). In this paper, we for the first time experimentally realize the cavity-length stabilization of the 1064/1470 ... More

New Global Potential Energy Surfaces of the ground 3A' and 3A' states of the H2O systemMay 30 2019This paper presents two new adiabatic, global potential energy surfaces (PESs) for the two lowest $^3A'$ and $^3A''$ electronic states of the O($^3P$)+H$_2$ system. For each of these states, ab initio electronic energies were calculated for more than ... More

Dual-Species, Multi-Qubit Logic Primitives for Ca+/Sr+ Trapped-Ion CrystalsMay 30 2019We demonstrate key multi-qubit quantum logic primitives in a dual-species trapped-ion system based on $^{40}$Ca+ and $^{88}$Sr+ ions, using two optical qubits with quantum-logic-control frequencies in the red to near-infrared range. With all ionization, ... More

Dissipation induced non-stationarity in a quantum gasMay 30 2019Non-stationary long-time dynamics was recently observed in a driven two-component Bose-Einstein condensate coupled to an optical cavity [N. Dogra, et al. arXiv:1901.05974] and analyzed in mean-field theory. We provide the full solution of the underlying ... More

Independent-subsystem interpretation of the double photoionization of pyrene and coroneneMay 29 2019It is shown that the M$^{2+}$ ion yield in the double photoionization of the aromatic hydrocarbons, pyrene and coronene, can be expressed as a superposition of a contribution from a resonance involving carbon atoms on the perimeter and coherent contributions ... More

Quantum interface for noble-gas spinsMay 29 2019Macroscopic quantum systems typically suffer from rapid loss of coherence via coupling to the environment. An ensemble of noble-gas nuclear spins is a unique isolated system that could maintain its coherence for many hours at room temperature and above. ... More

Battery Diagnostics with Sensitive MagnetometryMay 29 2019The ever-increasing demand for high-capacity rechargeable batteries highlights the need for sensitive and accurate diagnostic technology for determining the state of a cell, for identifying and localizing defects, or for sensing capacity loss mechanisms. ... More

Transverse optical pumping of spin statesMay 29 2019Optical pumping is an efficient method for initializing and maintaining atomic spin ensembles in a well-defined quantum spin state. Standard optical-pumping methods orient the spins by transferring photonic angular momentum to spin polarization. Generally ... More

Quantitative analysis of $p$-wave three-body losses via cascade processMay 29 2019We describe the three-body loss coefficient of identical fermions with $p$-wave interactions using a set of rate equations in which three-body recombination happens via an indirect process. Our theoretical treatment explains experimental results just ... More

Magnetic Feshbach resonances in ultracold collisions between Cs and Yb atomsMay 28 2019We investigate magnetically tunable Feshbach resonances in ultracold collisions between ground-state Yb and Cs atoms, using coupled-channel calculations based on an interaction potential recently determined from photoassociation spectroscopy. We predict ... More

Imaging the source of high-harmonics generated in atomic gas mediaMay 28 2019We report the application of the time gated ion microscopy technique in accessing online the position of the source of harmonics generated in atomic gas media. This is achieved by mapping the spatial extreme-ultraviolet (XUV)-intensity distribution of ... More

Transition rates for $3s3p^2\;^4P - 3s3p4s\;^4P^o$ transitions in Al IMay 27 2019Fully relativistic calculations have been performed for two multiplets, $3s3p^2\;^4P$ and $3s3p4s\;^4P^o$, in Al I. Wave functions were obtained for all levels of these multiplets using the GRASP programs. Reported are the E1 transitions rates for all ... More

Transition rates for $3s3p^2\;^4P - 3s3p4s\;^4P^o$ transitions in Al IMay 27 2019Jun 04 2019Fully relativistic calculations have been performed for two multiplets, $3s3p^2\;^4P$ and $3s3p4s\;^4P^o$, in Al I. Wave functions were obtained for all levels of these multiplets using the GRASP programs. Reported are the E1 transitions rates for all ... More

Ultracold collisions of Cs in excited hyperfine and Zeeman statesMay 27 2019We investigate Cs+Cs scattering in excited Zeeman and hyperfine states. We calculate the real and imaginary parts of the s-wave scattering length; the imaginary part directly provides the rate coefficient for 2-body inelastic loss, while the real part ... More

Triply magic conditions for microwave transition of optically trapped alkali-metal atomsMay 27 2019We report the finding of ``triply magic'' conditions (the magic frequency and magic intensity of optical dipole trap beam plus the magic magnetic field) for the microwave transitions of optically trapped alkali-metal atoms. The differential light shift ... More

Microring resonators on a membrane optical circuit for atom-light interactionsMay 27 2019We describe the design and fabrication of a scalable atom-light photonic interface based on a silicon nitride microring resonator on a transparent silicon dioxide-nitride multi-layer membrane. This new photonic platform is fully compatible with freespace ... More

Adiabatic and high-fidelity quantum gates with hybrid Rydberg-Rydberg interactionsMay 27 2019Rydberg blockaded gate is a fundamental ingredient for scalable quantum computation with neutral Rydberg atoms. However the fidelity of such a gate is intrinsically limited by a blockade error coming from a Rydberg level shift that forbids its extensive ... More

Two-qubit entangling gates within arbitrarily long chains of trapped ionsMay 24 2019May 28 2019Ion trap systems are a leading platform for large scale quantum computers. Trapped ion qubit crystals are fully-connected and reconfigurable, owing to their long range Coulomb interaction that can be modulated with external optical forces. However, the ... More

Two-qubit entangling gates within arbitrarily long chains of trapped ionsMay 24 2019Ion trap systems are a leading platform for large scale quantum computers. Trapped ion qubit crystals are fully-connected and reconfigurable, owing to their long range Coulomb interaction that can be modulated with external optical forces. However, the ... More

Analytical treatment of the interaction quench dynamics of two bosons in a two-dimensional harmonic trapMay 24 2019We investigate the quantum dynamics of two bosons, trapped in a two-dimensional harmonic trap, upon quenching arbitrarily their interaction strength thereby covering the entire energy spectrum. Utilizing the exact analytical solution of the stationary ... More

Emission of twin jets from a driven matter-wave soliton in a quasi-one-dimensional geometryMay 24 2019The modulation of the interaction between the atoms in a matter-wave soliton in a quasi-one-dimensional optical trap triggers an emission of correlated atom jets. We characterize the dependence of jet properties on the frequency, amplitude and length ... More

Error-Mitigated Quantum Gates Exceeding Physical Fidelities in a Trapped-Ion SystemMay 24 2019Various quantum applications can be reduced to estimating expectation values, which are inevitably deviated by operational and environmental errors. Although errors can be tackled by quantum error correction, the overheads are far from being affordable ... More

Electromagnetically-induced transparency, absorption, and microwave field sensing in a Rb vapor cell with a three-color all-infrared laser systemMay 23 2019A comprehensive study of three-photon electromagnetically-induced transparency (EIT) and absorption (EIA) on the rubidium cascade $5S_{1/2} \rightarrow 5P_{3/2}$ (laser wavelength 780~nm), $5P_{3/2} \rightarrow 5D_{5/2}$ (776~nm), and $5D_{5/2}\rightarrow ... More

Triple differntial cross section for electron impact ionization of hydrogen atomMay 23 2019The electron impact ionization of atomic hydrogen is calculated for incident elrctron energy 76.46 eV. The Hartree-Fock approximation is used to calculate the initial state which includes both bound and continum wave functions. The final state continuum ... More

Can three-body recombination purify a quantum gas?May 23 2019Three-body recombination in quantum gases is traditionally associated with heating, but it was recently found that it can also cool the gas. We show that in a partially condensed three-dimensional homogeneous Bose gas three-body loss could even purify ... More

Sub-cycle time resolution of multi-photon momentum transfer in strong-field ionizationMay 23 2019During multi-photon ionization of an atom it is well understood how the involved photons transfer their energy to the ion and the photoelectron. However, the transfer of the photon linear momentum is still not fully understood. Here, we present a time-resolved ... More

Metrology of time-domain soft X-ray attosecond pulses and re-evaluation of pulse durations of three recent experimentsMay 23 2019Attosecond pulses in the soft-X-ray (SXR) to water-window energy region offer the tools for creating and studying target specific localized inner-shell electrons or holes in materials, enable monitoring or controlling charge and energy flows in a dynamic ... More

Collimated UV light generation by two-photon excitation to a Rydberg state in Rb vaporMay 23 2019We use two continuous-wave (CW) laser beams of 780 nm and 515 nm to optically drive $^{85}$Rb atoms in a heated vapor cell to a low-lying Rydberg state 10D$_{5/2}$. We observe a collimated ultraviolet (UV) beam at 311 nm, corresponding to the transition ... More

New bounds from positronium decays on massless mirror dark photonsMay 22 2019Jun 03 2019We present the results of a search for a hidden mirror sector in positronium decays with a sensitivity comparable with the bounds set by the prediction of the primordial He$^{4}$ abundance from Big Bang Nucleosynthesis. No excess of events compatible ... More

New bounds from positronium decays on massless mirror dark photonsMay 22 2019We present the results of a search for a hidden mirror sector in positronium decays with a sensitivity comparable with the bounds set by the prediction of the primordial He$^{4}$ abundance from Big Bang Nucleosynthesis. No excess of events compatible ... More

Interference of Clocks: A Quantum Twin ParadoxMay 22 2019The phase of matter waves depends on proper time and is therefore susceptible to special-relativistic (kinematic) and gravitational time dilation (redshift). Hence, it is conceivable that atom interferometers measure general-relativistic time-dilation ... More

Measuring the temperature and heating rate of a single ion by imagingMay 22 2019We present a technique based on high resolution imaging to measure the absolute temperature and the heating rate of a single ion trapped at the focus of a deep parabolic mirror. We collect the fluorescence light scattered by the ion during laser cooling ... More

Implementation of gauge-invariant time-dependent configuration interaction singles method for three-dimensional atomsMay 22 2019We present a numerical implementation of the gauge-invariant time-dependent configuration interaction singles (TDCIS) method [Appl. Sci. 8, 433 (2018)] for three-dimensional atoms. In our implementation, orbital-like quantity called channel orbital [Phys. ... More

Critical transport and vortex dynamics in a thin atomic Josephson junctionMay 21 2019We study the onset of dissipation in an atomic Josephson junction between Fermi superfluids in the molecular Bose-Einstein condensation limit of strong attraction. Our simulations identify the critical population imbalance and the maximum Josephson current ... More

Extreme nuclear magnetic resonance: zero field, single spins, dark matter...May 21 2019An unusual regime for liquid-state nuclear magnetic resonance (NMR) where the magnetic field strength is so low that the $J$-coupling (intramolecular spin-spin) interactions dominate the spin Hamiltonian opens a new paradigm with applications in spectroscopy, ... More

Absolute frequency measurement of rubidium 5S-6P transitionsMay 21 2019We report on measurements on the 5S-6P rubidium transition frequencies for rubidium isotopes with an absolute uncertainty of better than \SI{450}{kHz} for the 5S $\rightarrow$ 6P$_{1/2}$ transition and \SI{20}{kHz} for the 5S $\rightarrow$ 6P$_{3/2}$ ... More

Ion friction at small values of the Coulomb logarithmMay 21 2019Transport properties of high-energy-density plasmas are influenced by the ion collision rate. Traditionally, this rate involves the Coulomb logarithm, $\ln\Lambda$. Typical values of $\ln\Lambda$ are $\approx 10~\mbox{to}~20$ in kinetic theories where ... More

Energy and radiative properties of the (3)1Π and (5)1Σ+ states of RbCs: Experiment and theoryMay 21 2019We combined high-resolution Fourier-transform spectroscopy and large-scale electronic structure calculation to study energy and radiative properties of the high-lying (3)1{\Pi} and (5)1{\Sigma}+ states of the RbCs molecule. The laser-induced (5)1{\Sigma}+(4)1{\Sigma}+(3)1{\Pi}-A(2)1{\Sigma}+ ... More

Photoelectron circular dichroism with Lissajous-type bichromatic fields: One- vs two-photon ionization of chiral moleculesMay 21 2019Angular distribution of photoelectrons released by the ionization of randomly-oriented molecules with two laser fields of carrier frequencies $\omega$ and $2\omega$, which are linearly polarized in two mutually-orthogonal directions, is analyzed in the ... More

Tailoring the Enhancement of and Interference among Higher Order Multipole Transitions in Molecules with a Plasmonic NanoantennaMay 21 2019Spontaneous emission of quantum emitters can be modified by engineering their optical environment. This allows a resonant nanoantenna to significantly modify the radiative properties of a quantum emitter. In this article, we go beyond the common electric ... More

Double ionization of three-electron atom: electronic correlation effectsMay 20 2019We study the effects of spin degrees of freedom and wave function symmetries on double ionization in three-electron systems. Each electron is assigned one spatial degree of freedom, and the resulting three-dimensional Schr\"odinger equation is integrated ... More

Quantum Transport of Rydberg Exciton with Synthetic Spin-Exchange InteractionsMay 20 2019We present a scheme for engineering quantum transport dynamics of spin excitations in a chain of laser-dressed Rydberg atoms, mediated by synthetic spin-exchange arising from diagonal van der Waals interaction. The dynamic tunability and long-range interaction ... More

Controlling the dipole blockade and ionization rate of Rydberg atoms in strong electric fieldsMay 20 2019We study a novel regime of the Rydberg excitation blockade using highly Stark-shifted, yet long-living, states of Rb atoms subject to electric fields above the classical ionization limit. Such states allow tuning the dipole-dipole interaction strength ... More

Strong-field photoelectron holography beyond the electric dipole approximation: a semiclassical analysisMay 20 2019Strong-field photoelectron holography denotes the interference of various electron paths in laser-induced ionization of atoms, leading to interference patterns in the final momentum distribution. For a quantitative description of holography beyond the ... More

Bethe logarithm for helium atomMay 20 2019The Bethe logarithm for a large set of states of the helium atom is calculated with a precision of 12-14 significant digits. The numerical data is obtained for the case of infinite mass of a nucleus. Then we study mass dependence and provide coefficients ... More

X-ray spectra of the Fe-L complexMay 20 2019The Hitomi results on the Perseus cluster lead to improvements in our knowledge of atomic physics which are crucial for the precise diagnostic of hot astrophysical plasma observed with high-resolution X-ray spectrometers. However, modeling uncertainties ... More

Elastic scattering of three ultracold bosonsMay 17 2019Elastic scattering of three bosons at low energy is a fundamental problem in the many-body description of ultracold Bose gases, entering via the three-body scattering hypervolume $D$. We study this quantity for identical bosons that interact via a pairwise ... More

Polychromatic, continuous-wave mirrorless lasing from monochromatic pumping of cesium vaporMay 16 2019We report on studies of simultaneous continuous-wave mirrorless lasing on multiple optical transitions, realized by pumping hot cesium vapor with laser light resonant with the 6$S_{1/2}\rightarrow 8$P$_{3/2}$ transition. The multiplicity of decay paths ... More

Arrays of optical tweezers based on 3D-printed microlens arraysMay 16 2019We present a novel tweezer system combining rapid prototyping of user defined microlens arrays with spatial light modulation for site-selective addressing. Using 3D femtosecond direct laser writing we manufacture a microlens array comprising 97 lenslets ... More

Concepts for direct frequency-comb spectroscopy of $^{229\text{m}}$ThMay 16 2019May 26 2019Direct laser spectroscopy of $^{229\text{m}}$Th was already discussed back in the 1990s, followed by the proposal for a nuclear optical clock in 2003. However, it was not until very recently that the $^{229\text{m}}$Th energy was constrained to sufficient ... More

Concepts for direct frequency-comb spectroscopy of $^{229\text{m}}$ThMay 16 2019Direct laser spectroscopy of $^{229\text{m}}$Th was already discussed back in the 1990s, followed by the proposal for a nuclear optical clock in 2003. However, it was not until very recently that the $^{229\text{m}}$Th energy was constrained to sufficient ... More

Trapping laser excitation during collisions limits the lifetime of ultracold moleculesMay 16 2019The lifetime of nonreactive ultracold bialkali gases was thought to be limited by sticky collisions that amplify three-body loss. We show that the sticking times were previously overestimated and cannot explain the observed loss. Instead, we consider ... More

Localization versus subradiance in three-dimensional scattering of lightMay 16 2019We study the scattering modes of a light in a three-dimensional disordered medium, above the critical density for Anderson localization. Contrary to the usual conductor-insulator transition picture, localized modes represent a minority of modes, even ... More

A quasiclassical method for calculating the density of states of ultracold collision complexesMay 16 2019We derive a quasiclassical expression for the density of states (DOS) of an arbitrary, ultracold, N-atom collision complex, for a general potential energy surface (PES). We establish the accuracy of our quasiclassical method by comparing to exact quantum ... More

Measurements of the branching ratios for $6P_{1/2}$ decays in $^{138}$Ba$^+$May 16 2019Measurement of the branching ratios for $6P_{1/2}$ decays to $6S_{1/2}$ and $5D_{3/2}$ in $^{138}$Ba$^+$ are reported with the decay probability from $6P_{1/2}$ to $5D_{3/2}$ measured to be $p=0.268177\pm(37)_\mathrm{stat}-(20)_\mathrm{sys}$. This result ... More

Observing topological charges and dynamical bulk-surface correspondence with ultracold atomsMay 16 2019In quenching a topological phase across phase transition, the dynamical bulk-surface correspondence emerges that the bulk topology of $d$-dimensional ($d$D) phase relates to the nontrivial pattern of quench dynamics emerging on $(d-1)$D subspace, called ... More

A Scalable Quantum Computing Platform Using Symmetric-Top MoleculesMay 15 2019We propose a new scalable platform for quantum computing (QC) -- an array of optically trapped symmetric-top molecules (STMs) of the alkaline earth monomethoxide (MOCH$_3$) family. Individual STMs form qubits, and the system is readily scalable to 100 ... More

State-selective single-electron capture in 30 keV N3+-He collisionsMay 15 2019The Cold-target recoil-ion momentum spectroscopy (COLTRIMS) has been employed to study the single-electron capture processes in collisions of N3+ ions with He atoms at an impact energy of 30 keV. The relative differential cross sections for the capture ... More

Exit momentum and instantaneous ionization rate of nonadiabatic tunneling ionization in elliptically polarized laser fieldsMay 15 2019Based on the strong-field approximation, we obtain analytical expressions for the initial momentum at the tunnel exit and instantaneous ionization rate of tunneling ionization in elliptically polarized laser fields with arbitrary ellipticity. The tunneling ... More

RMT: R-matrix with time-dependence. Solving the semi-relativistic, time-dependent Schrodinger equation for general, multi-electron atoms and molecules in intense, ultrashort, arbitrarily polarized laser pulsesMay 15 2019RMT is a program which solves the time-dependent Schrodinger equation for general, multielectron atoms, ions and molecules interacting with laser light. As such it can be used to model ionization (single-photon, multi-photon and strong-field), recollision ... More