• Fast adiabatic transport of single laser-cooled 9Be+ ions in a cryogenic Penning trap stack 

  Meiners, Teresa; Coenders, Julia A.; Brombacher, Johannes; Niemann, Malte; Cornejo, Juan M.; Ulmer, Stefan; Ospelkaus, Christian (Berlin ; Heidelberg : Springer, 2024)

  High precision mass and g-factor measurements in Penning traps have enabled groundbreaking tests of fundamental physics. The most advanced setups use multi-trap methods, which employ transport of particles between specialized ...
• MORe DWR: Space-time goal-oriented error control for incremental POD-based ROM for time-averaged goal functionals 

  Fischer, Hendrik; Roth, Julian; Wick, Thomas; Chamoin, Ludovic; Fau, Amelie (Amsterdam : Elsevier, 2024)

  In this work, the dual-weighted residual (DWR) method is applied to obtain an error-controlled incremental proper orthogonal decomposition (POD) based reduced order model. A novel approach called MORe DWR (Model Order ...
• A torsion balance as a weak-force testbed for novel optical inertial sensors 

  Bergmann, Gerald; Cordes, Carolin; Gentemann, Christoph; Händchen, Vitus; Qinglan, Wang; Yan, Hao; Danzmann, Karsten; Heinzel, Gerhard; Mehmet, Moritz (Bristol : IOP Publ., 2024)

  Torsion balances (TBs) are versatile instruments known for their ability to measure tiny forces and accelerations with high precision. We are currently commissioning a new TB facility to support the development and testing ...
• Coherent photo-thermal noise cancellation in a dual-wavelength optical cavity for narrow-linewidth laser frequency stabilisation 

  Dawel, Fabian; Wilzewski, Alexander; Herbers, Sofia; Pelzer, Lennart; Kramer, Johannes; Hild, Marek B.; Dietze, Kai; Krinner, Ludwig; Spethmann, Nicolas C. H.; Schmidt, Piet O. (Washington, DC : Optica, 2024)

  Optical resonators are used for the realisation of ultra-stable frequency lasers. The use of high reflectivity multi-band coatings allows the frequency locking of several lasers of different wavelengths to a single cavity. ...
• The Mullins–Sekerka problem via the method of potentials 

  Escher, Joachim; Matioc, Anca‐Voichita; Matioc, Bogdan‐Vasile (Weinheim : Wiley-VCH, 2024)

  It is shown that the two-dimensional Mullins–Sekerka problem is well-posed in all subcritical Sobolev spaces Hr (R) with r ϵ (3/2,2). This is the first result, where this issue is established in an unbounded geometry. The ...
• Single-Photon Level Dispersive Fourier Transform: Ultrasensitive Characterization of Noise-Driven Nonlinear Dynamics 

  Sader, Lynn; Bose, Surajit; Kashi, Anahita Khodadad; Boussafa, Yassin; Haldar, Raktim; Dauliat, Romain; Roy, Philippe; Fabert, Marc; Tonello, Alessandro; Couderc, Vincent; Kues, Michael; Wetzel, Benjamin (Washington, DC : ACS, 2023)

  Dispersive Fourier transform is a characterization technique that allows directly extracting an optical spectrum from a time domain signal, thus providing access to real-time characterization of the signal spectrum. However, ...
• Large-scale spatiotemporal calculation of photovoltaic capacity factors using ray tracing: A case study in urban environments 

  Bredemeier, Dennis; Schinke, Carsten; Niepelt, Raphael; Brendel, Rolf (Chichester : Wiley, 2023)

  Photovoltaics (PVs) on building facades, either building-integrated or building-attached, offer a large energy yield potential especially in densely populated urban areas. Targeting this potential requires the availability ...
• Nicolai maps with four-fermion interactions 

  Casarin, Lorenzo; Lechtenfeld, Olaf; Rupprecht, Maximilian (Berlin ; Heidelberg : Springer, 2023)

  Nicolai maps offer an alternative description of supersymmetric theories via nonlinear and nonlocal transformations characterized by the so-called ‘free-action’ and ‘determinant-matching’ conditions. The latter expresses ...
• A Casimir operator for a Calogero W algebra 

  Correa, Francisco; Leal, Gonzalo; Lechtenfeld, Olaf; Marquette, Ian (Bristol : IOP Publ., 2024)

  We investigate the nonlinear algebra W 3 generated by the 9 functionally independent permutation-symmetric operators in the three-particle rational quantum Calogero model. Decoupling the center of mass, we pass to a smaller ...
• Penning micro-trap for quantum computing 

  Jain, Shreyans; Sägesser, Tobias; Hrmo, Pavel; Torkzaban, Celeste; Stadler, Martin; Oswald, Robin; Axline, Chris; Bautista-Salvador, Amado; Ospelkaus, Christian; Kienzler, Daniel; Home, Jonathan (London [u.a.] : Nature Publ. Group, 2024)

  Trapped ions in radio-frequency traps are among the leading approaches for realizing quantum computers, because of high-fidelity quantum gates and long coherence times1–3. However, the use of radio-frequencies presents ...
• Modeling trends and periodic components in geodetic time series: a unified approach 

  Kermarrec, Gaël; Maddanu, Federico; Klos, Anna; Proietti, Tommaso; Bogusz, Janusz (Berlin ; Heidelberg : Springer, 2024)

  Geodetic time series are usually modeled with a deterministic approach that includes trend, annual, and semiannual periodic components having constant amplitude and phase-lag. Although simple, this approach neglects the ...
• Numerical Modeling and Open-Source Implementation of Variational Partition-of-Unity Localizations of Space-Time Dual-Weighted Residual Estimators for Parabolic Problems 

  Thiele, J.P.; Wick, T. (New York, NY [u.a.] : Springer Science + Business Media B.V., 2024)

  In this work, we consider space-time goal-oriented a posteriori error estimation for parabolic problems. Temporal and spatial discretizations are based on Galerkin finite elements of continuous and discontinuous type. The ...
• Error bounds for Lie group representations in quantum mechanics 

  van Luijk, Lauritz; Galke, Niklas; Hahn, Alexander; Burgarth, Daniel (Bristol : IOP Publ., 2024)

  We provide state-dependent error bounds for strongly continuous unitary representations of connected Lie groups. That is, we bound the difference of two unitaries applied to a state in terms of the energy with respect to ...
• A monolithic space–time temporal multirate finite element framework for interface and volume coupled problems 

  Roth, Julian; Soszyńska, Martyna; Richter, Thomas; Wick, Thomas (Amsterdam [u.a.] : North-Holland, 2024)

  In this work, we propose and computationally investigate a monolithic space–time multirate scheme for coupled problems. The novelty lies in the monolithic formulation of the multirate approach as this requires a careful ...
• An exact model for enhancing/suppressing primordial fluctuations 

  Domènech, Guillem; Vargas, Gerson; Vargas, Teófilo (London : IOP, 2024)

  Enhancements of primordial curvature fluctuations in single field inflation often involve departures from attractor trajectories in the phase space. We study enhancement/suppression of primordial fluctuations in one of the ...
• LISA Galactic Binaries with Astrometry from Gaia DR3 

  Kupfer, Thomas; Korol, Valeriya; Littenberg, Tyson B.; Shah, Sweta; Savalle, Etienne; Groot, Paul J.; Marsh, Thomas R.; Le Jeune, Maude; Nelemans, Gijs; Pala, Anna F.; Petiteau, Antoine; Ramsay, Gavin; Steeghs, Danny; Babak, Stanislav (London : Institute of Physics Publ., 2024)

  Galactic compact binaries with orbital periods shorter than a few hours emit detectable gravitational waves (GWs) at low frequencies. Their GW signals can be detected with the future Laser Interferometer Space Antenna ...
• The Covariance Metric in the Blaschke Locus 

  Dai, Xian; Eptaminitakis, Nikolas (New York, NY : Springer, 2024)

  We prove that the Blaschke locus has the structure of a finite dimensional smooth manifold away from the Teichmüller space and study its Riemannian manifold structure with respect to the covariance metric introduced by ...
• Ultraviolet supercontinuum generation using a differentially-pumped integrated glass chip 

  Wanie, Vincent; Barbato, Pasquale; Hahne, Josina; Ryabchuk, Sergey; Wahid, Ammar Bin; Amorim, David; Månsson, Erik P.; Trabattoni, Andrea; Osellame, Roberto; Martínez Vázquez, Rebeca; Calegari, Francesca (Bristol : IOP Publishing, 2024)

  We investigate the generation of ultrabroadband femtosecond ultraviolet (UV) radiation via third-order harmonic generation in highly confined gas media. A dual-stage differential-pumping scheme integrated into a glass ...
• Convolutional neural network for retrieval of the time-dependent bond length in a molecule from photoelectron momentum distributions 

  Shvetsov-Shilovski, N.I.; Lein, M. (Bristol : IOP Publ., 2024)

  We apply deep learning for retrieval of the time-dependent bond length in the dissociating two-dimensional H+2 molecule using photoelectron momentum distributions. We consider a pump-probe scheme and calculate electron ...
• Exploring the fundamental limits of integrated beam splitters with arbitrary phase via topology optimization 

  Nanda, Abhishek; Kues, Michael; Calà Lesina, Antonio (Washington, DC : Soc., 2024)

  Optical beam splitters are essential for classical and quantum photonic on-chip systems. In integrated optical technology, a beam splitter can be implemented as a beam coupler with two input and two output ports. The output ...

View more