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Martina GISTI (University of Bonn)12/10/2026, 18:00
We extend the concept of operator charge in the context of an abelian U (1) symmetry and apply this framework to symmetry-preserving matrix product operators (MPOs), enabling the description of operators projected onto specific sectors of the corresponding symmetry. Leveraging this representation, we study the effect of interactions on the scrambling of information in an integrable Heisenberg...
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Kriti BAWEJA (University of Bonn)12/10/2026, 18:08
We show how the effects of large numbers of measurements on many-body quantum ground and thermal states can be studied using Quantum Monte Carlo (QMC). Density matrices generated by measurement in this setting feature products of many local nonunitary operators, and by expanding these density matrices as sums over operator strings we arrive at a generalized stochastic series expansion (SSE)....
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Jannis KASTELL (University of Bonn)12/10/2026, 18:16
We develop a Quantum Monte Carlo method based on the Replica trick in order to calculate Renyi Negativities of any order. These quantities serve as multipartite and mixed state Entanglement measures. This method has been succesful in estimating Entanglement Entropies and is extended to Renyi Negativities. Subjecting the replicas to a non equilibrium protocol transforming their configuration...
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Manish Kumar (IISER Bhopal)12/10/2026, 18:24
Mobility edges (MEs) that separate localized, multifractal, and ergodic states in energy are a central concept in understanding Anderson localization. In this work, we study the effect of an additional constant offset on the mobility-edge formation in the one-dimensional all-bands-flat (ABF) diamond chain with a quasiperiodic potential. We show that this offset can transform anomalous mobility...
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Dr Saurav PANDEY (Ben Gurion University of the Negev)12/10/2026, 18:32
The PXP chain is the standard example of weak ergodicity breaking: a Neel product state fails to thermalise, returning periodically for long times, and the return is attributed to a tower of nearly equally spaced eigenstates. How nearly equally spaced they are, and whether the resulting revivals survive in the thermodynamic limit, has not been settled. We solve the forward-scattering...
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Prof. Kazuki YAMAMOTO (Osaka Metropolitan Uni)12/10/2026, 18:40
Open quantum systems under measurement have now been extensively studied because they exhibit interesting nonequilibrium dynamics absent in isolated quantum systems. Of particular interest is the physics of quantum trajectories, where one tracks the monitored dynamics with the measurement outcomes (i.e., quantum jumps) retained. Indeed, such quantum trajectories concerning many-body systems...
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Konrad PAWLIK (Jagiellonian University)12/10/2026, 18:48
Macroscopic conservation laws fundamentally bottleneck the time evolution of isolated quantum many-body states. We demonstrate that time-evolved states in ergodic disordered models act as typical states drawn from an instantaneous Scrooge ensemble $\rho(t)$—an ensemble that maximizes randomness subject to restriction on local charge profiles. Analytical predictions from this framework...
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Maria ZELENAYOVA (Stockholm University)12/10/2026, 18:56
I will present how different spin-1 models give rise to various types of fragmentation. The key to understanding when complex versus real spectra emerge is the interplay between the range and type of interactions. Interestingly, I will also present a toy model demonstrating how a complex spectrum can be mapped onto a system with open boundaries, despite the model itself having periodic boundaries.
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Vighnesh Dattatraya NAIK (University of Augsburg)12/10/2026, 19:04
State-of-the-art quantum simulation platforms, such as those in Rydberg atomic systems or trapped ions, are inherently long-range interacting, yet little is known about how their unique excitations govern out-of-equilibrium dynamics in two dimensions. Numerically simulating this real-time evolution in 2D, however, poses a serious computational bottleneck. In this Letter, we overcome these...
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Dr Nitin GUPTA (Jagiellonian University)12/10/2026, 19:12
Krylov complexity - a measure of operator growth through Heisenberg time evolution via the Lanczos-constructed Krylov basis - has proven useful as a probe of quantum chaos and dynamical phase transitions, but we ask whether it can also detect topological phase transitions, motivated by the fact that both the change in level statistics and the change in underlying geometry accompanying such...
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Dr Kristian Knakkergaard NIELSEN (Niels Bohr Institute, University of Copenhagen)12/10/2026, 19:20
We demonstrate strong non-ergodic behavior in the XY model on coupled chains, where domain-wall initial states retain an inhomogeneous magnetization profile for arbitrarily long times. We find that this effect arises due to zero modes protected by chiral symmetry. Using an analysis based on the Lanczos algorithm, we identify evidence for a localization transition in the thermodynamic limit at...
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