Moderately intense laser pulses can confine the axes of molecules to axes that are fixed in space through the polarizability interaction. This process is termed laser-induced alignment. [1,2] A large number of studies have established that a key parameter for achieving a high degree of alignment is a low rotational temperature of the molecules explored. For samples of gas phase molecules, a...
For thirty years, slow electron velocity imaging, a.k.a. SEVI [1], has relied on the idea that the maximum intensity circles obtained when monoenergetic electrons are projected on a detection plane are a direct visualization of transverse velocities. Quantitatively, the squared radii of those circles would directly provide a measure of the electron energy [2].
When the projected electrons...
Precise manipulation of a quantum degenerate gas can work for a quantum sensing for investigation of atom surface interactions owing to their high-sensitivity to electromagnetic fields such as van der Waals and Casimir-Polder potentials [1, 2]. In the vicinity of dielectric surface, particularly in the evanescent field region, theoretical models suggest that transition probabilities of...
We have detected self-amplified spontaneous emission (ASE) from He atoms in $3^+\ ^1P^o$ doubly excited state. This resonance with 63.66 eV excitation energy autoionizes within 80 fs but may also decay by spontaneously emitting a 40.75-eV photon to populate the 1s3s 1Se atomic state with $3\times 10^{-4}$ probability [1,2]. Despite such a small fluorescence branching ratio, our recent...
Anyons [1,2] are low-dimensional quasiparticles that obey fractional statistics, hence interpolating between bosons and fermions. In two dimensions, they exist as elementary excitations of fractional quantum Hall states and they are believed to enable topological quantum computing. One-dimensional (1D) anyons have been theoretically proposed, but their experimental realization has proven to be...
Over the last years, our team has employed a combination of electrospray ionization with radiofrequency ion guiding and trapping, to prepare targets of mass-selected trapped gas-phase biomolecular ions for photoexcitation/photoionization experiments using synchrotron, free electron laser or conventional laser beams [1] but also for collision experiment using MeV ions [2]. A recurrent problem...
Associative ionisation (AI), a fundamental atomic collision process, plays a crucial role in atomic physics, plasma physics and astrophysics, contributing to the ionisation of atoms and the formation of molecules. In this work we study AI in low-energy hydrogen atom collisions, in particular the reaction $\mathrm{H}(1s) + \mathrm{H}(ns) \to \mathrm{H}_2^++e^-$ with $2 \leq n \leq 10$, using a...
Due to their complex structure, molecules are interesting systems for applications in various fields such as quantum chemistry or precision measurements. But it also implies more difficult cooling techniques than for atoms.
This experiment on Barium Fluoride (BaF) aims at decelerating a supersonic molecular beam by using the electric force on ions, which is much more intense than the...
Quantum control of a wide class of molecules is crucial for advancing a variety of quantum applications. The potential of polyatomic molecular ions in this context can be significantly enhanced using the toolbox provided by quantum information processing and quantum logic spectroscopy (QLS).
These techniques rely on the ability to determine the state of the molecule which is almost impossible...
Bloch oscillations are a striking feature of the counterintuitive motion of particles created by a lattice potential [1]. However, this phenomenon does not require the presence of a lattice, nor is it limited to single-particle physics. One can reproduce such an effect with a system, possibly many-body, that is translationally invariant, provided that the dispersion relation remains periodic...
The absorption spectrum of diffuse interstellar clouds displays a rich set of lines - the diffuse interstellar bands (DIBs). The origin of the DIBs is intensely investigated since their first observation in 1922 [1] and remains elusive even today. Already with the discovery of C$_{60}$, Kroto et al. [2] proposed C$_{60}$ as a possible carrier for the DIBs. This hypothesis was later confirmed...
1. Introduction
The X-ray spectral range can address atomic scale (nm) spatial resolution at ultrafast time (fs) scales, with element specificity and site-selective excitation. Non-linear wave mixing techniques in this range, in particular four-wave mixing (FWM) methods, can thus provide information on the structural and electronic dynamics of atomic and molecular systems with...
Crystals of cold trapped ions are a promising platform for quantum technology and for studying the quantum many-body problem as a well-controlled toy many-body system. In modern state-of-the-art experiments, managing the entropy of large Coulomb crystals becomes challenging due to the exponential scaling of the Hilbert space with the number of trapped ions. In particular, as we demonstrate,...
Recent advancements in quantum optics have significantly enhanced our understanding of interactions between quantum emitters, driving progress in quantum technologies. Collective phenomena emerge when multiple quantum emitters interact via a shared electromagnetic mode, leading to effects like correlated decay and coherent photon exchange and the coupling of two-level quantum emitters to a...
Arrays of single atoms in optical tweezers are a strong contestant in the race for quantum computing and simulation platforms [1]. Besides their strengths - scalability, environmental isolation and adaptability - the system still lags speed when it comes to qubit manipulation and readout. This project aims to implement a new fast detection scheme to enable measurements on the microsecond...
Electron-ion collision experiments in a merged beams geometry (electron cooler) are well established at ion storage rings. A complete new range of experiments is possible if the geometry is changed to a crossed-beams setup in 90° angle between the electron and ion beams employing a dedicated free-electron target. The target bridges the gap between low-collision-energy experiments in electron...
The results of a newly developed version of the Molecular Convergent Close-Coupling (MCCC) method [1,2] of calculating cross sections for electron scattering on the H$_3^+$ molecule are reported. Integrated cross sections for dissociative electronic excitation and ionisation are presented, yielding good agreement with the experiment [3,4]. The causes of previous disagreements between theory...
Correlated strong-field double ionization exhibits a characteristic 'knee' structure in the double ionization yield as a function of intensity [1-3]. This feature arises because of the contribution from the nonsequential double ionization (NSDI) process, in which the electron-electron interaction rather than independent tunneling plays a key role.
Generally, NSDI enhancement is attributed...
Spin-squeezed states are a prototypical example of metrologically useful states where structured entanglement allows for enhanced sensing with respect to the one possible using classically correlated particles. Relevant aspects are both the efficient preparation of spin-squeezed states and the scalability of estimation precision with the number $N$ of probes. Recently, in the context of the...
Crossed molecular beam experiments serve as a robust approach for investigating the dynamics of elementary gas-phase reactions [1], with Velocity Map Imaging (VMI) enabling the determination of energy and angle-resolved differential cross-sections [2]. Building on our previous investigation of the reactive scattering between N$^+$ ions and O$_2$ neutrals, where two distinct product channels...
We present the determination of the intermolecular dissociation energies of M-Ar1-3 (Where M= Naphthalene, Naphthol and 2,2 PBI) complexes by measuring the sequential desorption energies of Ar atoms from the aromatic surface. The dispersion-dominated M-Ar1-3 complexes were produced in the gas phase and characterized using resonant two-photon ionization (R2PI) spectroscopy. The disappearance of...
We investigate binary dipolar supersolids as a platform for tunable Josephson junctions in atomtronics. By rotating a binary dipolar condensate, we induce the nucleation of quantized vortices, which act as self-assembled weak links between localized superfluid domains. In our work, we show that these weak links resemble Dayem bridges in superconductors and aperture arrays in liquid helium....
Atomic clocks realize unperturbed transition frequencies of atoms or ions. For clocks operated at room temperature, the Stark shift from thermal radiation of the environment causes the largest frequency shift and needs to be corrected for with high accuracy. In ion-based systems two methods have been employed to assess the sensitivity of the transition frequency to room-temperature blackbody...
We calculate the cross section and the rate constant for the process of dissociative positronium attachment to the F$_2$ molecule at thermal energies. The process results in an anomalously large positronium annihilation rate, which can possibly explain the observed rapid positronium annihilation in halogen gases.
When fast positrons (e.g., those produced in $\beta ^+$ decay) thermalise and...
Electron emission from nanometer-scale metallic tips has gained significant interest due to field enhancement at the apex, enabling emission at lower intensities [1]. Laser-induced field emission from sharp tips has paved the way for ultrafast pulsed electron sources with high spatiotemporal resolution. While previous studies focused on light polarization and incidence angle effects [2], we...
Abstract:-
Chlorpyrifos (O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate) is one of the harmful pesticide that persist long time in the environment and effect human health. As a result of its accumulation in the environment and the effect it causes on human health its degradation into non-harmful substances is of high importance. In recent days, Plasma assisted degradation that...
Solvated electrons play important roles in the origin and formation of radiation damage in biological tissue as well as for large-scale chemical synthesis, where they are used as strong reducing agents. While in the former case solvated electrons are created by the interaction of liquids with ionizing radiation, in the latter case they are typically produced by the dissolution of alkali metals...
When galactic cosmic ray protons propagate through gas clouds in space they collide with atoms and molecules, transferring energy in the process. In order to calculate the photon flux produced as a result of these collisions knowledge of the rovibrationally resolved cross sections for excitation is required [ 1]. The most prevalent species in these environments is the hydrogen molecule....
Decoherence is usually considered detrimental in quantum information and quantum optics applications. However, the interplay between environment dynamics and unitary evolution can give rise to interesting quantum many-body phenomena and can even be harnessed to become a useful resource.
As it is well known, in dense atomic arrays coupled to a common radiation mode, collective spontaneous...
Solar wind sputtering is a key process driving material ejection from the lunar surface and contributing to the exosphere [1 – 5]. We present high-precision sputter yield measurements on Apollo 16 regolith samples, complemented by advanced 3D regolith modeling. Our results show that sputter yields for H and He ions at solar wind energies are nearly an order of magnitude lower than previously...
Metastable levels are responsible for parity forbidden lines occurring in many low-density astrophysical plasmas, found in e.g gaseous nebulae, planetary nebulae, protostars, stellar chromospheres. Line ratios from forbidden lines are a reliable tool for diagnostics of temperature and density of low-density astronomical objects.
We have applied the laser probe technique [1] to singly ionized...
Large momentum transfer techniques are essential tools to enhance the sensitivity of atom interferometers. So far, elastic scattering processes like Bloch Oscillations and sequential Bragg diffraction have proven to be effective means of implementing large momentum transfer. To fully exploit the potential of these methods, an accurate theoretical description is crucial. In this work, we utilize...
Traditionally, photoionization studies have been carried out in the frequency domain by measuring the cross-section and angular distributions of photoelectrons. Newly developed laser assisted interferometric techniques expand these studies into the time domain thus marking the advent of attosecond science [1]. Here we show that the attosecond time delay, also known as the Wigner time delay...
The Neutral Atom KAT-1 Collaboration is working on the realisation of a full-stack quantum computing solution, with a quantum processing unit (QPU) based on neutral atoms with Rydberg interactions, trapped in optical tweezer arrays. Out of a total of three QPU setups: a first generation 88Sr system in Amsterdam and the 2nd generation 88Sr setup in Eindhoven, this work...
Organic polymers have wide applications in the aereospace industry (e.g. in satellites and spacecrafts). However, when such materials are used in spacecraft external surfaces in Low Earth Orbit (LEO - up to 2000 km above Earth’s surface), they are subject to erosion due to exposure to the main atmospheric components at such altitudes, i.e. atomic oxygen (AO) and O$^+$ ion. Current...
Shortcuts to adiabaticity (STA) are powerful tools that can be used to control quantum systems with high fidelity. They work particularly well for single particle and noninteracting systems which can be described exactly and which possess invariant or self-similar dynamics. However, finding an exact STA for strongly correlated many-body systems can be difficult,as their complex dynamics may...
Quantum-logic protocols have emerged as an important tool for characterization of trapped atomic and molecular ions with complex energy-level structures. In such schemes, the internal state of the target ion is mapped onto a state of a co-trapped logic ion with accessible transitions, typically via shared motional modes.
Here, we report on quantum-logic state detection of $N_2^+$ with...
The observation of quantum phenomena often necessitates sufficiently pure states, a requirement that can be challenging to achieve. In this study, our goal is to prepare a non-classical state originating from a mixed state, utilizing dynamics that preserve the initial low purity of the state. We generate a quantum superposition of displaced thermal states within a microwave cavity using only...
We have performed a full sticking dynamics of H atom on graphenic surface using mixed quantum classical dynamics. These dynamics calculations are parametrized using DFT-VdW-rvv10 functional to obtain potential and phonon modes.
Using this dynamics, for the first time, we have shown the H atom being chemisorbed and physorbed at the same time.
In the astrophysical context, our results show...
Radiotherapy remains a cornerstone of breast cancer treatment, with IMRT offering precise dose delivery while sparing healthy tissues. Treatment planning systems (TPS) frequently incor-porate a smoothing function for intensity-modulated radiation therapy (IMRT) plans. This enables users to modify the intricacy of the beam fluence pattern in the x-y direction. Smoothing factor is a key...
We present ionization cross sections in collisions between electron and positron impact with Ar(3p) target. The calculations were performed classically using the three body CTMC approxi-mation. We found that the ionization probabilities as a function of impact parameter show differ-ent distributions for electron and positron impact. For the case of positron impact the distribution is...
Over the last two decades, a drift of interest in molecular science has steered towards the creation and manipulation of ultracold molecules. The intricate internal structure of molecules due to the presence of rotational and vibrational degrees of freedom attracts more attention because of their application in quantum simulation, precision measurement, and ultracold chemistry. To date, a...
Ion-molecule reactions play a fundamental role in the chemical evolution of the Universe, driving the formation of increasingly complex organic molecules in various astrophysical environments. Reactions of ions with molecules are particularly dominant in the diffuse interstellar medium, in molecular clouds and in the photon-dominated regions, as the proportion of ionized molecules is...
Mixtures of noble gases are regularly present in the active media of high-power gas lasers and in a variety of UV and VUV radiation sources, including excimer lamps and microplasma cell arrays. In addition to atoms and atomic ions, the plasmas of these mixtures contain homonuclear and heteronuclear molecular ions of inert gases. An important feature of heteronuclear BA$^{+}$ ions is the...
Scintillating materials are finding their application as radiation detectors in many fields of human activity, such as medicine (TOF-PET), high-energy and space research, border crossing safety controls and others. The most used and studied materials so far are solid-state systems, such as CsI:Tl, Bi4Ge3O12, Y(Lu)3Al5O12:Ce, (Lu,Y)2SiO5:Ce and others. In recent years, distributed radiation...
We present a theoretical study of weakly bound quantum systems in ultracold Bose-Fermi mixtures, focusing on their halo character and universal scaling behavior [1,2]. Using Variational Monte Carlo (VMC) and Diffusion Monte Carlo (DMC) methods, we compute ground-state binding energies and spatial distributions of few-body states formed near a Feshbach resonance in the...
We present results of calculations of attosecond delays [1] in molecules containing heavy atoms and a methodology for inclusion of relativistic effects.
We focus on streaking delays in iodoalkanes at high photon energies around 100 eV, which probe the iodine 4d shell. In collaboration with the experimental group of R. Kienberger of TU Munich our ultimate aim is to understand streaking from...
Using wave properties of matter, cold atoms can become tiny quantum sensors with high stability and sensitivity to inertial quantities, such as rotation or acceleration. The principle of a cold-atom gravimeter is the following: cold atoms (a few μK) free fall in an ultra-high vacuum chamber, submitted to the Earth gravity g. While they are falling, one can probe the atoms with lasers in a...
Osmium is the element of the Periodic Table with the atomic number Z equal to
76. In Tokamaks with divertors made of tungsten (Z = 74), it will be produced in the neutron-induced transmutation of the latter. Therefore one can expect that their sputtering may generate ionic impurities of all possible charge states in the fusion plasma. As a consequence, these could contribute to radiation...
Two-Dimensional Optical Spectroscopy (2DOS) is a third-order nonlinear optical spectroscopic technique capable of correlating excitations between states in molecular and material systems (1, 2). The technique makes use of three light pulses, two pump pulses and a probe pulse, which when incident on the system generates a third-order signal that can be heterodyne detected by the probe pulse or...
In recent years, shielding of ultracold molecules [1, 2] from close collisions inside an optical dipole trap has brought remarkable achievements in cooling molecules to quantum degeneracy [3, 4]. Shielding can be achieved by an external static electric field or a near-resonant microwave. This external field also allows the creation of weakly bound tetratomic molecules (“tetramers”) from a pair...
Ultrastable lasers locked to Fabry-Perot resonators are an important part of optical clocks, providing narrow bandwidth radiation for the excitation of clock transitions and acting as flywheel during deadtimes. The best systems operated at both room and cryogenic temperatures are limited by Brownian thermal noise of the dielectric mirror coatings [1-2]. Crystalline AlGaAs mirror coatings due...
In the following work I will present the spectral properties of acrolein in gas phase and in water studied using adaptive Quantum Thermal Bath (adQTB) method. In this work we show using this method we can possibly recover some of the peaks missed in simple molecular dynamics model and also the broadening of the spectrum. Though QTB and Wigner type methods give some broadening, they are not in...
Photon-stimulated desorption or photodesorption by UV photons is a fundamental process playing a role in interstellar environments and the surface icy satellites in our solar system. Photodesorption has been proposed to provide an efficient non-thermal desorption route of the interstellar ices present in the cold regions of the ISM, contributing to molecular gas phase abundances measured by...
As one of the building blocks of DNA, dAMP is vital for life as we know it. Previous studies have been performed that focused on the study of the breakup process of the molecule from CID [1] or from photofragmentation [2]. A spectrum of the relative fragmentation cross section of deprotonated dAMP was previously done [3] at room temperature. In our current work we have measured a spectrum of...
In the interstellar medium (ISM) and circumstellar environments, photoionization or the photoelectric effect emerges as a prevalent phenomenon. In regions exposed to UV photons, either stellar or secondary photons induced by cosmic rays, polycyclic aromatic hydrocarbons (PAHs) liberate electrons through the photoelectric effect, efficiently contributing to the heating budget of the gas. In...
Collective atomic or solid-state excitations present important advantages for encoding qubits, such as strong directional coupling to light. Unfortunately, they are plagued by inhomogeneities between the emitters, which make the qubit decay into a quasi-continuum of dark states. In most cases, this process is non-Markovian. Through a simple and resource-efficient formalism, we unveil a regime...
We investigate the application of quantum annealing on the D-Wave Advantage 2 platform for both combinatorial optimization and quantum many-body physics. First, we explore room scheduling optimization for sports camps at the Australian Institute of Sport, formulating the problem as a binary integer programming task. By comparing classical, hybrid, and quantum annealing approaches, we assess...
We investigate intrinsic quantum correlations—such as polarization and quadrature entanglement—in the ultraviolet dual-comb output generated from a Cr:ZnS-based system operating at 2.4 μm. Using nonlinear crystals such as periodically poled lithium niobate (PPLN), we have coherently interfered harmonics up to the 7th order (330–390 nm) with sub-femtosecond timing precision and observed stable...
Neutral atoms trapped in optical potentials have emerged as a rapidly progressing platform for quantum information processing. Alkaline-earth and alkaline-earth-like atoms are particularly attractive due to their long-lived qubit states, the theoretically well-understood hyperfine structure, and the ability to precisely control their interactions with external fields. Among these systems,...
Sea salt aerosols are among the most abundant natural aerosols and play a significant role for the climate. They mainly consist of sodium chloride, which is involved in chemical reactions in the atmosphere with atmospherically relevant trace gases. Such reactions are simulated in our experiments.
We use electrospray ionization (ESI) to produce gas-phase sodium chloride cluster ions....
Reconstruction of Quantum Gates using Quantum Process Tomography
*Arash Dezhang Fard$^{1,2}$, Yujie Sun$^{1}$, Marek Kopciuch$^{4}$, Adam Miranowicz$^{4}$, Szymon Pustelny$^{1,3}$
$^1$Marian Smoluchowski Institute of Physics, Jagiellonian University in Krakow, 30-348 Krakow, Poland
$^2$Doctoral School of Exact and Natural Sciences, Jagiellonian University in Krakow, 30-348 Krakow,...
Focused electron beam-induced deposition (FEBID) is a direct-write technique for depositing nanostructures on the surface in the sub-10 nm regime [1]. Due to their magnetic properties, iron nanostructures have the potential to be used in magnetic storage devices, and nano-sensing [2]. For use in FEBID, the iron atoms are surrounded by suitable ligands to ensure the volatility of the precursor....
The plasmas of noble gas mixture, routinely used as the active media of the powerful gas lasers, as well as of the sources of UV- and VUV-range radiation, contains, apart from the electrons, atomic ions and neutral atoms, also a fraction of homonuclear and heteronuclear molecular ions. Such heteronuclear ions have moderate to small dissociation energies in the range from 13.1 to 647 meV (for...
In recent years, the detection rate of molecules in the interstellar medium (ISM) has been accelerating (CDMS 2024) [1]. This is in large part thanks to significant advances in detection techniques and astronomical data processing. Nitriles (or cyanides) are among the most abundant chemical species in the ISM. They are key species in prebiotic chemistry and their role in the so-called RNA...
Antiprotonic atoms are exotic objects where one or more electrons have been replaced by antiprotons [1]. Numerous phenomena can be observed using such atoms, making them very interesting objects for experimental and theoretical studies. Creating such objects requires an efficient source of antiprotons, such as the ELENA ring at CERN [2]. The delivered antiprotons can be captured and stored in...
We theoretically and experimentally demonstrate the generation of attosecond vortex pulse trains, i.e. a succession of attosecond pulses with a helical wavefront, resulting from the coherent superposition of a comb of high-order harmonics carrying the same orbital angular momentum (OAM)[1]. The control of spin and OAM degrees of freedom in extreme ultraviolet attosecond pulses brings new...
We develop a compact optical frequency reference system based on the two-photon transition between the 5S$_{1/2}$, F=2 state and 5S$_{5/2}$, F=4 states of $^{87}$Rb atoms in a microfabricated chip-cell, which was successfully implemented for frequency stabilization of a self-referenced SBS microcomb [1]. A 1556 nm laser (DFB1550p, Thorlabs) was used in conjunction with a second-harmonic...
Attosecond spectroscopy have been mostly performed to date using table-top experimental set ups employing high-harmonic generation (HHG) techniques. The success of this technology was recognized with the Nobel Prize in Physics in 2023. Additionally, in the last decade, free electron laser (FEL) facilities have been commissioned all over the world, generating high brilliance and high intense...
The structure and morphology of interstellar water ice analogues play a crucial role in molecular adsorption and surface chemistry, influencing processes such as H₂ adsorption in cold astrophysical environments. In this study, we investigate the physical properties of amorphous solid water (ASW) ices deposited at 10 K under ultra-high vacuum using the COSPINU2 setup. Employing a multi-probe...
We present the study of dilute Bose-Bose mixture of two hyperfine states of $^{39}$K confined by an external harmonic potential in one spatial direction extending the recent research of some of the authors [1] towards the two-dimensional limit, in which the liquid phase is formed whenever the intraspecies interactions are repulsive and the interspecies one is attractive [2].
First, we...
Light shift, or ac Stark shift, plays an important role in vapor cell frequency standards, and substantial efforts have focused on minimizing its impact on frequency stability. Its temperature dependence is, on the other hand, generally considered negligible compared to the pressure shift arising from buffer gas collisions. Thus, it is of primary concern to find the so called inversion...
Accurately reproducing the discrete spectral peaks observed in solid-state high-order harmonic generation (HHG) typically requires the explicit inclusion of dephasing effects [1, 2]. Here, we contrast numerical simulations with analytical modeling to clarify how dephasing affects both the spectral structure and the driver field dependence of the harmonics, with particular emphasis on the...
In a series of combined experimental studies and molecular dynamics simulations on linear and cyclic dipeptides in gas phase we identified pathways that may provide effective mechanisms for their survival to temperature variation or exposition to radiation in space [1]. The most intriguing result is that these molecules may either ‘protect’ themselves turning the linear structure into a cyclic...
This research project investigates the development and use of the triatomic molecule YbCaF for measuring the magnetic quadrupole moment (MQM) of the Yb-173 nucleus. This property is of interest as it breaks CP symmetry, contributing to the understanding of matter-antimatter asymmetry. The YbCaF molecule is ideal for this: the quadrupole-deformed Yb-173 nucleus enhances the size of the MQM for...
We present our current progress towards a quantum gas microscope apparatus for experiments with ultracold dysprosium atoms exhibiting long-range dipole-dipole interactions (DDI). In addition to its large permanent magnetic dipole moment, Dy offers a set of closely-spaced opposite parity states (OPS), that can be dressed by microwave radiation to give rise to a tunable electric DDI. This...
The full understanding and modeling of few-body systems remains a long-standing challenge in several areas of science, particularly in quantum physics. The ability to create and manipulate dilute gases at ultracold temperatures, composed of particles with kinetic energies E = k$_B$T << 1 mK opened novel opportunities in this respect. The growing availability of quantum gases of ultracold polar...
Ultracold coherent control of molecular collisions at a Förster resonance
The advent of ground-state controlled ultracold dipolar molecules in dense gases has opened many exciting perspectives for the field of ultracold matter. When the molecules are dipolar, their extremely controllable properties have inspired many...
Phonon antibunching or phonon blockade effect (PBE), a hallmark of quantum mechanical behavior in vibrational systems, offers promising prospects in quantum information processing and phonon-based quantum computing. In this work, we explore the phenomenon of phonon antibunching in a system comprising two coupled nanomechanical resonators (NAMRs) interacting with a two-level system (TLS). We...
We investigate a cold ensemble of magnetically trapped $^{87}$Rb atoms, that can be magnetically transported into a high-finesse optical cavity. Within the cavity, the atoms are either kept in the magnetic trap, or transferred into a cavity-sustained optical dipole trap [1]. The cloud can be diagnosed by the scattering of a transverse laser into the cavity, where the resulting cavity field is...
Synopsis High-order Harmonic Generation (HHG) driven by few-cycle near-infrared (NIR) pulses produces a comb of spectrally broad odd harmonics in the eXtreme Ultra-Violet (XUV) range. Owing to the spectral width of the harmonics, electron wave packets (EWPs) singly photoionized to the continuum interfere with EWPs tak-ing a two-photon path (XUV+NIR). We analytically discuss the...
Supersolids are exotic states of matter that spontaneously break two symmetries: gauge invariance through the phase-locking of the wavefunction, and translational symmetry owing to the emergence of a crystalline structure. In a first part, we report on the theoretical study and experimental observation of vortices in a dipolar supersolid of Dysprosium [1]. When rotated, the supersolid phase...
