Quantum Simulation and Quantum Computing with Ultracold Fermionic Atoms in Optical Lattices

• Immanuel Bloch

Room: H030

Talk

• Michael Knap

Room: H030

Spin-resolved microscopy of strontium SU(N) Fermi-Hubbard systems

• Leticia Tarruell

Room: H030

Quantum and classical algorithms for many-body Gibbs states

• Dima Abanin

Room: H030

Simulating particle collisions using quantum computers

• Roland Farrell

Room: H030

Observation of hadron scattering in a lattice gauge theory on a quantum computer

• Julian Schuhmacher

Room: H030

Hybrid Analog-Digital Quantum Simulation with Ultracold Fermions

• Philipp Preiss

Room: H030 Understanding strongly correlated many-fermion systems remains one of the central open challenges in condensed matter physics. Quantum gas microscopes have enabled major advances in this direction by providing analog quantum simulators with single-site- and single-atom-resolved control and detection. However, compared to digital quantum information processors, analog platforms remain limited in local control and programmability. A promising route forward is provided by hybrid approaches that combine analog simulation with digital quantum control. These paradigms aim to unite the scalability and intrinsic entanglement of analog systems with the programmability and flexibility of gate-based operations, enabling improved capabilities for state preparation and readout. In this talk, I will present novel approaches that integrate optical lattice implementations of Fermi–Hubbard systems with programmable methods for state initialization and gate-based manipulation and readout. I will show how hybrid tweezer/lattice architectures enable the initialization of fully programmable Hubbard states in their motional ground states [1]. I will further discuss recently developed schemes based on optical superlattices that allow the construction of arbitrary single-particle unitaries [2] and provide a route toward implementing variational eigensolver protocols for molecular structure problems from quantum chemistry [3]. As a first experimental step toward gate-based manipulation of correlated fermionic states, we have recently demonstrated high-fidelity collisional gates in optical superlattices [4]. References [1] N. Jain et al., arXiv: 2512.09849 (2026) [2] A. Roth et al., arXiv:2603.04210 (2026) [3] F. Gkristis et al., PRX Quantum 6, 010318 (2025) [4] P. Bojović et al., arXiv:2506.14711 (2025)

Microscopic Dynamics of False Vacuum Decay in the 2+1D Quantum Ising Model

• Umberto Borla

Room: H030 False vacuum decay is a prominent phenomenon relevant to elementary particle physics and early-universe cosmology. Understanding its microscopic dynamics is currently a major challenge and research thrust. Recent advances in numerical techniques allow for the extraction of related signatures in tractable systems in two spatial dimensions over intermediate timescales. Here, we focus on the 2 + 1D quantum Ising model, where a longitudinal field is used to energetically separate the two $\mathbb{Z}_2$ symmetry-broken ferromagnetic ground states, turning them into a “true” and “false” vacuum. Using tree tensor networks, we simulate the microscopic dynamics of a spin-down domain in a spin-up background after a homogeneous quench, with parameters chosen so that the domain corresponds to a bubble of the true vacuum in a false-vacuum background. We identify how the ultimate fate of the bubble—indefinite expansion or collapse—depends on its geometrical features and on the microscopic parameters of the Ising Hamiltonian. We further provide a realistic quantum-simulation scheme, aimed at probing bubble dynamics on atomic Rydberg arrays.

Observation of constructive interference at the edge of quantum ergodicity

• Nikita Astrakhantsev

Room: H030

Studying doped magnet with a Rydberg quantum simulator

• Antoine Browaeys

Room: H030

Talk

• Hannes Pichler

Room: H030

New tools for resource-efficient digital simulation with atom arrays

• Jake Covey

Room: H030 Arrays of neutral atoms in optical tweezers are an excellent setting for simulating the dynamics of quantum matter. Programmable control over each atom and their interactions in the array offers new capabilities for compiling Hamiltonians that are not amenable to direct analog simulations with global control, and it offers the possibility to perform simulations at the logical level to obviate physical errors. I will present two platforms that offer new capabilities to enable such digital simulations in a resource-efficient manner. First, with ytterbium-171 atom arrays, I will present methods to (1) encode multiple qubits within each atom, and (2) overcome the bottleneck of atom transport via a novel “streaming” architecture where atoms move with constant velocity. Second, with metastable helium-3 atom arrays, I will present methods to utilize the fermionic quantum statistics in addition to the motion of atoms in harmonic tweezer traps to natively encode itinerant fermions and Fermi-Bose interactions in a programmable simulator.

State preparation and detection for quantum simulation of particle collisions

• Federica Surace

Room: H030

Quantum computing with metastable atomic qubits

• Johannes Zeiher

Room: H030

Superconducting Pairing Correlations on a 98-qubit Trapped-Ion Quantum Computer

• Henrik Dreyer

Room: H030

What can AI agents do for quantum physics?

• Florian Marquardt

Room: H030

Talk

• Dries Sels

Room: H030

Ultra-high resolution spectral functions using complex-time Krylov spaces

• Sebastian Paeckel

Room: H030

Quantum simulation with neutral atoms: from analog to digital

• Sasha Geim

Room: H030

Emergent Gauge Theories and Universal Codes from Analog and Digital Quantum Dynamics

• Ruben Verresen

Room: H030

An infinite hierarchy of multi-copy quantum learning advantages

• Richard Kueng

Room: H030 Learning properties of quantum states from measurement data is a fundamental challenge in quantum information. The sample complexity of such tasks depends crucially on the measurement primitive. While shadow tomography achieves sample-efficient learning by allowing entangling measurements across many copies, it requires prohibitively deep circuits. At the other extreme, two-copy measurements already yield exponential advantages over single-copy strategies in tasks such as Pauli tomography. In this work we show that such sharp separations extend far beyond the two-copy regime: for every prime c we construct explicit learning tasks of degree c, which are exponentially hard with (c - 1)-copy measurements but efficiently solvable with c-copy measurements. Our protocols are not only sample-efficient but also realizable with shallow circuits. Extending further, we show that such finite-degree tasks exist for all square-free integers c, pointing toward a general principle underlying their existence. Together, our results reveal an infinite hierarchy of multi-copy learning problems, uncovering new phase transitions in sample complexity and underscoring the role of reliable quantum memory as a key resource for exponential quantum advantage.

Probing Complex Quantum Dynamics with Pauli Path Spectroscopy

• Andreas Elben

Room: H030

Open quantum many-body systems: thermalization and efficient mixing

• Álvaro Alhambra

Room: H030

Many-body memories

• Ethan Lake

Room: H030

Quenches across the Bose Glass transition

• Ulrich Schneider

Room: H030

Fading ergodicity

• Lev Vidmar

Room: H030

Creating and Exploring Bose-Einstein Condensates of Dipolar Molecules

• Sebastian Will

Room: H030

Ergodicity breaking meets criticality in a gauge-theory quantum simulator

• Ana Hudomal

Room: H030

Preparing injective PEPs with gapped parent Hamiltonians.

• Rahul Trivedi

Room: H030 Projected entangled pair states (PEPs) describe area law states that are believed to be ground states of gapped Hamiltonians in 2 and higher dimension. I will present a few results concerning a class of PEPs which additionally satisfy an injectivity condition - these PEPs can describe states that are not topologically ordered but are still ground states of gapped local Hamiltonians. First, I will show that all such PEPs can be prepared with polylog(N) depth geometrically local circuits from a trivial product state: In addition to providing a state-preparation algorithm, this provides the first formal proof that injective PEPs with gapped parent Hamiltonian are in the same phase as a product state. Next, I will consider certain simple dissipative strategies to prepare these PEPs and provide results on how a rapid-mixing dissipative algorithm with several rigorous guarantees can be devised to prepare these PEPs.

Running Quantum Computers in Discovery Mode

• Benedikt Placke

Room: H030 We propose using quantum computers in conjunction with classical machine learning to discover instances of interesting quantum many-body dynamics. Concretely, an “interest function” is defined for a given circuit (family) instance that can be evaluated on a quantum computer. The circuit is then adapted by a classical learning agent to maximize interest. We illustrate this approach using two examples and show numerically that, within a sufficiently general circuit family, two simple interest functions based on (i) classifiability of evolved states and (ii) spectral properties of the unitary circuit, are maximized by discrete time crystals (DTCs) and dual-unitary circuits, respectively. For (i), we simulate the adaptive optimization and show that it indeed finds DTCs with high probability, and we evaluate the interest function on a quantum device beyond the (easily) classically simulable regime. Our results show substantial gradients even at large system size and hence provide evidence showing that the interest function is indeed amenable to numerical optimization. This suggests that learning agents with access to quantum-computing resources can discover new phenomena in many-body quantum dynamics, and establishes the design of good interest functions as a future research paradigm for quantum many-body physics.

Floquet superheating

• Hongzheng Zhao

Room: H030

Non-ergodic dynamics in SU(2) lattice gauge theory: scars, fragmentation, and disorder-free localization

• Giovanni Cataldi

Room: H030 Non-Abelian lattice gauge theories provide a setting where local constraints reshape far-from-equilibrium quantum many-body dynamics and can obstruct thermalization. In a (1+1)D SU(2) lattice gauge theory with dynamical matter, three non-ergodic phenomena are identified, each with a different origin. In regimes where the gauge-invariant dynamics is otherwise ergodic, low-overhead product-state quenches exhibit robust quantum many-body scarring, seen as long-lived coherent oscillations in local observables and pronounced fidelity revivals enabled by non-Abelian meson and baryon–antibaryon excitations. In a separate region of parameters, the gauge-invariant model becomes nonthermal yet delocalized due to Hilbert-space fragmentation into disconnected Krylov subsectors. Finally, when static SU(2) background charges are introduced to encode gauge superselection sectors, and the system is initialized in a coherent superposition of these sectors, disorder-free localization emerges even where a fixed sector is ergodic: spatial matter inhomogeneities persist at long times, and entanglement exhibits MBL-like (logarithmic) growth. These results provide a unified benchmark suite for non-ergodic far-from-equilibrium dynamics in non-Abelian constrained systems and are compatible with digital quantum simulation on existing qudit platforms.