New frontiers in out-of-equilibrium quantum many-body dynamics

The workshop New frontiers in out-of-equilibrium quantum many-body dynamics
brought together leading theorists and experimentalists from condensed
matter physics, quantum optics, quantum information, and statistical mechanics.
The scientific program highlighted the central themes of the field through
concrete advances and showcased the growing interplay between theory and
experiment. The workshop attracted the attendance of a significant number
of established leading scientists from world-leading organizations, and included
a total of 95 participants; there were 23 participants from Germany and 72
participants from abroad.
Talks such as Probing dynamics of correlated states with an analog-digital
quantum simulator and Gate-Based Quantum Simulation of Fermi-Hubbard Models
demonstrated the rapidly developing power of quantum simulation to study
strongly correlated matter. A number of contributions, including Measurementinduced
spectral transitions and measurement-induced spectral crossover and Decodable
phases of quantum many-body dynamics with coherent noise, explored
unitary and measurement-driven circuit dynamics, directly linking fundamental
physics to the design of quantum error correction protocols. Driven quantum
systems were well represented, with presentations like Prethermal Time-
Crystalline Corner Modes and Prethermalization by Random Multipolar Driving
on a 78-Qubit Superconducting Processor, which illustrated how periodic and
quasiperiodic drives can stabilize novel dynamical regimes such as time crystals.
The role of disorder and localization was discussed in talks such as Absence of
diffusion in strongly disordered quantum chains and Ultraslow Growth of Number
Entropy in an ℓ-Bit Model of Many-Body Localization, underlining their
continued importance in shaping nonequilibrium dynamics. The exploration
of new phases and transitions away from equilibrium was emphasized in contributions
such as Probing Non-Equilibrium Topological Order on a Quantum
Processor and Entanglement, topological order and glassiness in finite temperature
quantum phases.
Participants who introduced non-mainstream ideas include:
• Anushya Chandran (Boston University, USA): The Moving Born-Oppenheimer
Approximation
• Wen Wei Ho (National University of Singapore, Singapore): Geometric
quantum drives: Hyperbolically driven quantum systems and beyond
• Markus Heyl (University of Augsburg, Germany): Active quantum flocks
In addition, Curt von Keyserlingk (King’s College London, United Kingdom)
gave a colloquium on Subexponential Decay of Local Correlations from
Diffusion-Limited Dephasing, which was accessible to non-specialists while offering
new insights for experts alike. Ulrich Schneider (University of Cambridge,
United Kingdom) presented puzzling experimental results on non-equilibrium
dynamics in frustrated optical lattices that continue to challenge both theory
and numerics.
Among the emerging young researchers who participated in the workshop
and gave talks were
• Claudia Artiaco, who introduced the Local-Information Time Evolution
algorithm;
• Philipp Preiss, talking about Gate-Based Quantum Simulation of Fermi-
Hubbard Models with applications to quantum chemistry;
• Brice Bakkali-Hassani, introducing long-lived circular Rydberg states as
an alternative platform for quantum simulation;
• Federico Balducci, who talked about symmetry re-breaking in an effective
theory of quantum coarsening;
• Ryusuke Hamazaki, presenting recent work on Measurement-induced spectral
transitions and measurement-induced spectral crossover.
Taken together, the workshop provided a vivid snapshot of the state of the
art in nonequilibrium quantum science. By grounding broad themes such as
entanglement dynamics, disorder effects, and nonequilibrium phases in specific
experimental and theoretical advances, the meeting successfully bridged theory
and experiment and charted promising directions for future exploration.