Alexander Baumgärtner
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View article: Generalization of Variadic Structures with Binders: A Tool for Structural Code Comparison
Generalization of Variadic Structures with Binders: A Tool for Structural Code Comparison Open
This paper introduces a novel anti-unification algorithm for the generalization of variadic structures with binders, designed as a flexible tool for structural code comparison. By combining nominal techniques for handling variable binding …
View article: Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions
Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions Open
Metastability and its relaxation mechanisms challenge our understanding of the stability of quantum many-body systems, revealing a gap between the microscopic dynamics of the individual components and the effective descriptions used for ma…
View article: High-fidelity entanglement and coherent multi-qubit mapping in an atom array
High-fidelity entanglement and coherent multi-qubit mapping in an atom array Open
Neutral atoms in optical tweezer arrays possess broad applicability for quantum information science, in computing, simulation, and metrology. Among atomic species, Ytterbium-171 is unique as it hosts multiple qubits, each of which is impac…
View article: Adiabatic echo protocols for robust quantum many-body state preparation
Adiabatic echo protocols for robust quantum many-body state preparation Open
Entangled many-body states are a key resource for quantum technologies. Yet their preparation through analog control of interacting quantum systems is often hindered by experimental imperfections. Here, we introduce the adiabatic echo prot…
View article: Pauli crystal superradiance
Pauli crystal superradiance Open
Pauli crystals are unique geometric structures of non-interacting fermions, resembling crystals, that emerge solely from Fermi statistics and confinement. Unlike genuine quantum crystals that arise from interparticle interactions, Pauli cr…
View article: Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions
Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions Open
Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases, reflecting the emergence of collective non-equilibrium behavior. We study such a transition in a Bose-Einstein condensate coupled to an optical…
View article: Bandstructure of a coupled BEC-cavity system: effects of dissipation and geometry
Bandstructure of a coupled BEC-cavity system: effects of dissipation and geometry Open
We present a theoretical model for a transversally driven Bose-Einstein condensate coupled to an optical cavity. We focus on the interplay between different coherent couplings, which can trigger a structural phase transition, known as the …
View article: A Python GPU-accelerated solver for the Gross-Pitaevskii equation and applications to many-body cavity QED
A Python GPU-accelerated solver for the Gross-Pitaevskii equation and applications to many-body cavity QED Open
TorchGPE is a general-purpose Python package developed for solving the Gross-Pitaevskii equation (GPE). This solver is designed to integrate wave functions across a spectrum of linear and non-linear potentials. A distinctive aspect of Torc…
View article: Codebase release 1.0 for TorchGPE
Codebase release 1.0 for TorchGPE Open
TorchGPE is a general-purpose Python package developed for solving the Gross-Pitaevskii equation (GPE). This solver is designed to integrate wave functions across a spectrum of linear and non-linear potentials. A distinctive aspect of Torc…
View article: Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions
Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions Open
Metastability and its relaxation mechanisms challenge our understanding of the stability of quantum many-body systems, revealing a gap between the microscopic dynamics of the individual components and the effective descriptions used for ma…
View article: Pulmonary Vein Isolation for Atrial Fibrillation: Comparison of a Very High-Power Very Short-Duration (vHPvSD) Ablation Protocol versus a Hybrid Ablation Approach—Procedural and Mid-Term Outcome Data
Pulmonary Vein Isolation for Atrial Fibrillation: Comparison of a Very High-Power Very Short-Duration (vHPvSD) Ablation Protocol versus a Hybrid Ablation Approach—Procedural and Mid-Term Outcome Data Open
Background: Pulmonary vein isolation (PVI) using radiofrequency ablation (RFA) is a standard-of-care treatment in the rhythm control strategy of symptomatic atrial fibrillation (AF). Ablation protocols, varying in the power and duration of…
View article: A Python GPU-accelerated solver for the Gross-Pitaevskii equation and applications to many-body cavity QED
A Python GPU-accelerated solver for the Gross-Pitaevskii equation and applications to many-body cavity QED Open
TorchGPE is a general-purpose Python package developed for solving the Gross-Pitaevskii equation (GPE). This solver is designed to integrate wave functions across a spectrum of linear and non-linear potentials. A distinctive aspect of Torc…
View article: Complex continued fractions, Kleinian and extremal theory for cusp excursions
Complex continued fractions, Kleinian and extremal theory for cusp excursions Open
For the each of the five Euclidean rings of complex quadratic integers, we consider a complex continued fraction algorithm with digits in the ring. We show for each algorithm that the maximal digit obeys a Fréchet distribution. We use this…
View article: Multimode-polariton superradiance via Floquet engineering
Multimode-polariton superradiance via Floquet engineering Open
We consider an ensemble of ultracold bosonic atoms within a near-planar cavity, driven by a far detuned laser whose phase is modulated at a frequency comparable to the transverse cavity mode spacing. We show that a strong, dispersive atom-…
View article: Report on 2011.12309v3
Report on 2011.12309v3 Open
We consider an ensemble of ultracold bosonic atoms within a near-planar cavity, driven by a far detuned laser whose phase is modulated at a frequency comparable to the transverse cavity mode spacing.We show that a strong, dispersive atom-p…
View article: First order phase transition between two centro-symmetric superradiant crystals
First order phase transition between two centro-symmetric superradiant crystals Open
We observe a structural phase transition between two configurations of a superradiant crystal by coupling a Bose-Einstein condensate to an optical cavity and applying imbalanced transverse pump fields. The transition can be interpreted as …
View article: Measuring the dynamics of a first order structural phase transition between two configurations of a superradiant crystal
Measuring the dynamics of a first order structural phase transition between two configurations of a superradiant crystal Open
We observe a structural phase transition between two configurations of a superradiant crystal by coupling a Bose-Einstein condensate to an optical cavity and applying imbalanced transverse pump fields. We find that this first order phase t…
View article: Constraint Solving over Multiple Similarity Relations
Constraint Solving over Multiple Similarity Relations Open
Similarity relations are reflexive, symmetric, and transitive fuzzy relations. They help to make approximate inferences, replacing the notion of equality. Similarity-based unification has been quite intensively investigated, as a core comp…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi></mml:math>-Band Induced Self-Organization and Dynamics with Repulsively Driven Ultracold Atoms in an Optical Cavity
-Band Induced Self-Organization and Dynamics with Repulsively Driven Ultracold Atoms in an Optical Cavity Open
We investigate a Bose-Einstein condensate strongly coupled to an optical cavity via a repulsive optical lattice. We detect a stable self-ordered phase in this regime, and show that the atoms order through an antisymmetric coupling to the P…
View article: Two-mode Dicke model from nondegenerate polarization modes
Two-mode Dicke model from nondegenerate polarization modes Open
We realize a non-degenerate two-mode Dicke model with competing interactions\nin a Bose-Einstein condensate (BEC) coupled to two orthogonal polarization\nmodes of a single optical cavity. The BEC is coupled to the cavity modes via\nthe sca…
View article: Development of application‐oriented competency frameworks: Empirical findings from the validation of such a framework by means of an employer survey
Development of application‐oriented competency frameworks: Empirical findings from the validation of such a framework by means of an employer survey Open
This paper describes the development of application‐oriented competency frameworks using the example of a project to develop such a framework for existing study programs in the domain of business and law at a Swiss university of applied sc…
View article: Unranked Anti-Unification with Hedge and Context Variables
Unranked Anti-Unification with Hedge and Context Variables Open
In this work we study anti-unification for unranked terms and hedges, permitting context and hedge variables. Hedges are sequences of unranked terms. The anti-unification problem of two hedges s and q is concerned with finding their genera…
View article: Unranked second-order anti-unification
Unranked second-order anti-unification Open
In this work we study anti-unification for unranked terms and hedges, permitting context and hedge variables. Hedges are sequences of unranked terms. The anti-unification problem of two hedges s˜ and q˜ is concerned with finding their gene…
View article: Higher-Order Pattern Anti-Unification in Linear Time
Higher-Order Pattern Anti-Unification in Linear Time Open
We present a rule-based Huet's style anti-unification algorithm for simply typed lambda-terms, which computes a least general higher-order pattern generalization. For a pair of arbitrary terms of the same type, such a generalization always…