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Erik Geesmann (Leibniz Universität Hannover)05/10/2026, 10:30
Hybrid tweezer arrays of molecules and atoms represent a novel and promising platform for quantum science and technology. Optical tweezers enable highly flexible and dynamic trapping configurations. With their rich internal level structures and long rotational state coherence times, molecules are well suited for storing quantum information and can serve as excellent qubits. Their interactions...
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Bahar Öztürk (uni-muenchen)05/10/2026, 10:45
In atom–cavity platforms, fast readout of individual atom states remains a key bottleneck for scalability the system. We implement a cavity array microscope — a parallel atom–cavity interface for simultaneous, cavity-enhanced readout and atom–photon interfacing in a rubidium–ytterbium Rydberg array — to improve readout times and networking rates. Rather than pursuing a short, high-finesse...
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Maximilian Kob (5th Institute of Physics, University of Stuttgart)05/10/2026, 11:00
We report on progress towards a fully dynamical optical tweezer platform employing a fast, phase-only spatial light modulator (SLM) within the QRydDemo experiment, a neutral-atom quantum computing demonstrator based on the Strontium fine-structure qubit [1,2]. Due to intensity flickering along sequences of Gerchberg–Saxton-based holograms, smooth transitions between frames are generated using...
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Nessa Baum05/10/2026, 11:45
Optical tweezers are a powerful tool for the manipulation of neutral atoms in ultracold quantum gases. In particular single atom optical tweezers have become an established technique in state of the art quantum gas experiments. Thus retrofitting existing experimental setups with single atom tweezers allows for exploration of novel physics beyond original experimental capabilities. However, in...
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Jan Erik Axmann (Leibniz Universität Hannover)05/10/2026, 12:00
Photon collection plays an important role in super-resolution microscopy, where localization precision strongly depends on the number of detected photons. Here, we present a new lens system combining a semi spherical solid immersion lens with an aspherical relay lens, designed to achieve an effective numerical aperture above 2.0 and near-unity collection efficiency. In addition to improving...
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Thomas Benedikt Beck (University Bonn)05/10/2026, 12:15Talk
Optical cavities are among the most powerful tools for enhancing atom–light coupling and constitute a key building block for future quantum technologies based on light–matter interfaces. Rydberg atoms, with their strong and tunable interactions, are a particularly attractive non-linear medium for such interfaces. We present the design and construction of a low-finesse, rectangular,...
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Jule Brosig (Universität Tübingen)05/10/2026, 13:45Talk
Quantum simulation with single Rydberg atoms in an optical tweezer array is a powerful tool for investigating complex quantum systems. During the excitation of the atoms, however, technical and physical imperfections lead to decoherence in the system. In our case, a limiting technical imperfection is the phase noise of the laser used for the single-photon Rydberg excitation. A physical...
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Varad Dhodapkar (Heidelberg University)05/10/2026, 14:00Talk
Our time-reversal protocol is implemented in a dipolar interacting, isolated many-body spin system represented by Rydberg states in an atomic gas. This protocol can be used in measurement of out-of-time-order correlators (OTOCs) since time reversal is essential for an OTOC which requires backward evolution of a system which can then be used to measure the extent of information scrambling in...
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Moritz Linnebacher05/10/2026, 14:15Talk
Isolated, dipole–dipole-interacting Rydberg atoms realise effective pseudospin Hamiltonians dominated by exchange interactions. Reversing the sign of the exchange term enables time-reversal protocols and thus provides a route towards measuring out-of-time-order correlators (OTOCs). However, additional higher-order terms in the effective Hamiltonian, arising from couplings to off-resonant...
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06/10/2026, 10:00
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Sofiia Kokhanska (Institute of Spintronics and Quantum Information, Faculty of Physics and Astronomy, Adam Mickiewicz University)06/10/2026, 10:30
Nonclassical correlations between different bosonic modes constitute one of the key signatures of quantum behavior in hybrid quantum systems and play an important role in quantum information processing, quantum communication, and quantum sensing. In particular, inter-mode quantum correlations provide valuable insight into the transfer and redistribution of quantum excitations in coupled...
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Andreas Weber (Department Physik, Universität Basel)06/10/2026, 10:45
Hybrid quantum systems that combine complementary physical platforms offer a promising route toward devices capable of simultaneously storing, processing, and transmitting quantum information.[1] In our experiment, we combine a spin-polarized ultracold atomic ensemble and a membrane optomechanical system to realize such a hybrid platform. We engineer coherent interactions between the two...
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Alexandre Huot de Saint-Albin (Basel University)06/10/2026, 11:00
Quantum feedback is a powerful technique for controlling quantum systems. The conventional strategy relies on quantum-limited measurements followed by classical processing and feedback actuation onto the system. However, quantum mechanics also allows coherent feedback of quantum signals. Such coherent feedback may exploit the information stored in non-commuting observables, while circumventing...
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Paula Turkiewicz (Adam Mickiewicz University)06/10/2026, 11:15
Neuromorphic computing aims to perform machine-learning tasks directly in physical hardware, exploiting the system's own dynamics instead of digital simulation. Wanjura and Marquardt recently proposed realizing neural networks in a physical system based on linear wave scattering, showing that a nonlinear activation function can emerge from purely linear optics [1]. Here, we test this idea by...
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Magnus Michael Rusch (Universität Tübingen)06/10/2026, 11:45Talk
We present the current status of our experimental setup for imaging ${}^6$Li atoms in near-resonant optical tweezers.
The tweezers are generated using light at a wavelength of $674.6 \text{ nm}$, close to the ${}^6$Li $D$-line resonance at $671 \text{ nm}$. This configuration provides a promising platform for combination with an optical lattice operating at $841 \text{ nm}$. The chosen...
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David Gopalan (RPTU Kaiserslautern-Landau)06/10/2026, 12:00Talk
Ultracold quantum gases are versatile model systems for quantum simulation, since both the quantum gas itself and its surrounding potential landscape can be controlled with high precision [1].
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The generation of nearly arbitrary optical potentials is made possible through Digital Micromirror Devices (DMDs), which consist of arrays of individually tiltable micrometer-sized mirrors.
Here, I... -
Om Pote (Johannes Gutenberg Universität-Mainz)06/10/2026, 12:15Talk
Abstract
The preparation of excited many-body eigenstates is a central challenge in quantum simulation. In the Fermi–Hubbard model, the double well constitutes a local building block of a many body extended system. In this thesis, a controlled scheme for preparing two-particle eigenstates of a repulsively interacting fermions in a double-well system is developed and experimentally...
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Kaveri Jagtap (Leibniz Universität Hannover)07/10/2026, 10:00
Measurements are the cornerstone of physics. Precision measurements and sensing at mid-infrared (MIR) wavelengths remain complicated by the limited availability of low-noise detectors between 1000 and 10000 nm. Warm alkali metal vapors have long served as a versatile, low-cost platform for spectroscopy and nonlinear optics.
Here we explore hot atomic rubidium vapor to drive the...
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Luise Heiland07/10/2026, 10:15
Quantum computers based on neutral atoms hold great potential for revolutionary discoveries across research and industry. However, scaling these systems requires precise, real-time control of laser power to manipulate atomic qubits reliably. Integrated photonics – especially based on electro-optically active materials such as LTOI – has emerged as a platform to pulse laser light used to...
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Sudhir Suresh Babu (Max Planck Institute of Quantum Optics)07/10/2026, 10:30
Probing the Standard Model with Atomic Deuterium
Hydrogen-like systems have a unique advantage for probing bound-state QED, as their energies can be computed from first principles. By comparing the transition frequencies of various energy levels, one can test the consistency of QED and also extract fundamental quantities, such as the Rydberg constant and nuclear radii, that are not...
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Mehrzad Firoozi (Leibniz Universität Hannover)07/10/2026, 10:45
Quantum random number generators (QRNGs) exploit inherently unpredictable quantum effects to generate genuine randomness, making them valuable for cryptographic and scientific applications. One promising approach is based on homodyne detection of the vacuum state. In this work, we develop a QRNG using this technique and evaluate both the raw and postprocessed random sequences using the AIS...
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Vicente Yael Baca Montero (RPTU Kaiserslautern Landau)07/10/2026, 11:30Talk
In recent years, radio-frequency (RF) magnetic fields have become increasingly important tools in ultracold-atom and quantum-gas experiments. Because many of these experiments rely on glass-cell vacuum chambers, where stable ultra-high vacuum (UHV) is critical, it is essential to verify that the presence of an RF coil (or any source of time-dependent magnetic fields) does not compromise vacuum...
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Juan Antonio Luna Gutierrez (RPTU Kaiserslautern and University of Hamburg)07/10/2026, 11:45Talk
The superradiant phase transition takes place when an ensemble of ultracold atoms collectively coupled to a single-mode cavity is transversally driven by a classical coherent pump. Above a critical drive strength, the system transitions from a normal to a superradiant phase, building up a non-zero cavity field while the atoms form a crystalline pattern. In this work, we extend this standard...
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08/10/2026, 10:00
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M. Ludwig08/10/2026, 10:30Talk
Trapped ions are widely used for optical clocks [1], quantum computing [2], and tests of fundamental physics [3], offering optical transitions from the ultraviolet to the infrared. However, conventional free-space optics limit alignment stability and scalability, constraining the full exploitation of these systems. Photonic integration addresses these limitations by replacing bulky free-space...
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Christian Miguel Karres (Johannes Gutenberg Universität-Mainz)08/10/2026, 10:45Talk
Alongside high-fidelity logic gates and quantum-error correction (QEC), scalability remains a primary benchmark for practical quantum computation (QC). Shuttling-based trapped-ion architectures represent one of the most advanced platforms for executing quantum algorithms. However, implementations relying on linear ion traps have limited scalability and significant shuttling overhead....
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Yu Wang (University of Ülm)08/10/2026, 11:00Talk
Buckminsterfullerene C₆₀ is a benchmark large molecule — highly symmetric, rigid, and readily sublimed and ionized — making its cation C₆₀⁺ one of the most accessible large molecular ions to produce. It is also the first identified molecular carrier of the diffuse interstellar bands, assigned through cold gas-phase spectroscopy, so buffer-gas cooling of C₆₀⁺ in RF traps directly underpins such...
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Florian Rickert (Universität Hamburg)08/10/2026, 11:45Talk
As quantum computers advance, the need for quantum networks becomes more apparent. In order to realize a quantum internet, we need to connect processors over long distances. With quantum cryptography, security levels in communication could then be raised to unprecedented levels.
Due to the exponential loss of photons in fibers over long distances, an optical quantum network relies on...
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Felix Rohe (Universität des Saarlandes)08/10/2026, 12:00Talk
Telecom quantum light sources such as quantum dots, as well as weak coherent laser pulses have recently been gaining importance for quantum repeater applications, by entangling the photons with quantum memory nodes, possessing long spin coherence times [1]. However, since most of the quantum memories exhibit an optical interface in the visible or near-infrared, telecom-to-visible quantum...
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Linus Ehre (Saarland University)08/10/2026, 12:15Talk
Quantum networks play an important role in quantum information science as they promise secure communication as well as applications in distributed quantum computing and quantum metrology. To expand them over large distances, however, quantum repeaters based on entanglement distribution are required to minimize optical fiber losses. This increases the demand for efficient interfaces between...
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Joscha Locher (Universität Basel)08/10/2026, 13:45Talk
Large-scale quantum networks require a scalable, mass-producible memory platform. Ground-state atomic vapor memories are a promising candidate: room-temperature operation makes them experimentally simple, and they have been shown to perform well across a range of figures of merit. Their noise performance is compatible with preserving the non-classical photon-number statistics of retrieved...
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Marco Arnds (Universität Hamburg)08/10/2026, 14:00Talk
Quantum key distribution (QKD), which generates a cryptographic
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key via a quantum channel, has paved the way for physically secure
communication. Over the last decades, most efforts in developing QKD
focused on long-distance implementations, which are costly and challenging due to exponential losses of photons in quantum channels. An alternative approach is hybrid cryptography, where key... -
Yajie Liang08/10/2026, 14:15
Quantum mechanics (QM) textbooks shape our foundational understanding as students, serve as our primary references as researchers, and guide our strategies as teaching assistants. But how well do these texts actually reflect the modern quantum landscape? This study analyzes the didactic structures of university-level QM textbooks across nations and eras by mapping the placement of mathematical...
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Bahar Öztürk (uni-muenchen)Poster
We present the design and construction of a dual-element neutral-atom platform combining Rb-87 and Yb-171 for scalable quantum information processing and distribution. Encoding data and ancilla qubits in distinct atomic species suppresses optical crosstalk, enables faster two-qubit gates, and yields functionally specialized qubits within a single array. The apparatus pairs a compact...
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Om PotePoster
We report on the development of a quantum simulation platform based on Rydberg-excited
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⁴⁰Ca⁺ ions confined in a Penning trap [1,2]. The platform is designed to study long-time
quantum dynamics, collective behavior, and nonequilibrium phenomena in open many-body
systems on timescales far beyond those accessible with conventional trapped-ion simulators
[3].
Exciting ions to Rydberg states...
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