135 citations · 397 across the 23 of their papers we have counts for
23 papers
Scalable and Versatile Identification for Hierarchical Structural Causal Models: A New Look at Project STAR
Janis Aiad, Aghiles Drali, Aymen El Ouadrhiri +6
The STAR (Student-Teacher Achievement Ratio) experiment (1985, Tennessee, USA) is a landmark hierarchical dataset designed to assess the impact of class size on student outcomes, w…
Reinforcement Learning to Harness Approximation Errors for Long-Time Quantum Simulation
Yu-Bo Shi, Markus Heyl, Roderich Moessner +2
Accurate digital quantum simulation at long times is limited by the accumulation of errors inherent to approximate simulation. Here we introduce RL-Trotter, a reinforcement-learnin…
From stable periodic orbits to many-body chaos: doubly tunable prethermalization via engineering of an emergent band structure
Jianan Wang, Yang Hou, Andrea Pizzi +3
We uncover a family of many-body periodic orbits in a periodically driven (Floquet) spin system away from the high-frequency limit. While linear stability analysis predicts that pe…
Floquet Superheating
Yang Hou, Andrea Pizzi, Huike Jin +3
Periodically driven many-body systems generally heat towards a featureless 'infinite-temperature' state. As an alternative to uniform heating in a clean system, here we establish a…
Emergent long-tail dynamics in driven magnets with dynamical frustration
Chenyue Guo, Hongzheng Zhao, Zi Cai
In this study, we show that dynamical frustration can spontaneously emerge in frustration-free magnetic systems under periodic driving. Specifically, we consider a classical spin s…
Complex and tunable heating in conformal field theories with structured drives via classical ergodicity breaking
Liang-Hong Mo, Roderich Moessner, Hongzheng Zhao
Emission and absorption of energy are fundamental aspects of non-equilibrium dynamics. The heating induced by driving a many-body system is perhaps the most straightforward diagnos…
Non-Hermitian delocalization in 1D via emergent compactness
Liang-Hong Mo, Zhenyu Xiao, Roderich Moessner +1
Potential disorder in 1D leads to Anderson localization of the entire spectrum. Upon sacrificing hermiticity by adding non-reciprocal hopping, the non-Hermitian skin effect compete…
Floquet-engineered Emergent Massive Nambu-Goldstone Modes
Yang Hou, Zhanpeng Fu, Roderich Moessner +2
We present a general framework to implement massive Nambu-Goldstone quasi-particles in driven many-body systems. The underlying mechanism leverages an explicit Lie group structure…
Learning effective Hamiltonians for adaptive time-evolution quantum algorithms
Hongzheng Zhao, Ao Chen, Shu-Wei Liu +3
Digital quantum simulation of many-body dynamics relies on Trotterization to decompose the target time evolution into elementary quantum gates operating at a fixed equidistant time…
Experimental observation of a time rondeau crystal: Temporal Disorder in Spatiotemporal Order
Leo Joon Il Moon, Paul Manuel Schindler, Yizhe Sun +6
Our understanding of phases of matter relies on symmetry breaking, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Rece…
Engineering Hierarchical Symmetries
Zhanpeng Fu, Roderich Moessner, Hongzheng Zhao +1
The capacity to custom tailor the properties of quantum matter and materials is a central requirement for enlarging their range of possible functionalities. A particularly promisin…
Adaptive Trotterization for time-dependent Hamiltonian quantum dynamics using piecewise conservation laws
Hongzheng Zhao, Marin Bukov, Markus Heyl +1
Digital quantum simulation relies on Trotterization to discretize time evolution into elementary quantum gates. On current quantum processors with notable gate imperfections, there…
Prethermalization in aperiodically kicked many-body dynamics
Jin Yan, Roderich Moessner, Hongzheng Zhao
Driven many-body systems typically experience heating due to the lack of energy conservation. Heating may be suppressed for time-periodic drives, but little is known for less regul…
Temporal disorder in spatiotemporal order
Hongzheng Zhao, Johannes Knolle, Roderich Moessner
Time-dependent driving holds the promise of realizing dynamical phenomenon absent in static systems. Here, we introduce a correlated random driving protocol to realize a spatiotemp…
Variational Quantum Gate Optimization at the Pulse Level
Sean Greenaway, Francesco Petiziol, Hongzheng Zhao +1
We experimentally investigate the viability of a variational quantum gate optimization protocol informed by the underlying physical Hamiltonian of fixed-frequency transmon qubits.…
Making Trotterization adaptive and energy-self-correcting for NISQ devices and beyond
Hongzheng Zhao, Marin Bukov, Markus Heyl +1
Simulation of continuous time evolution requires time discretization on both classical and quantum computers. A finer time step improves simulation precision, but it inevitably lea…
Prethermalization in periodically-driven nonreciprocal many-body spin systems
Adam J. McRoberts, Hongzheng Zhao, Roderich Moessner +1
We analyze a new class of time-periodic nonreciprocal dynamics in interacting chaotic classical spin systems, whose equations of motion are conservative (phase-space-volume-preserv…
Orthogonal Quantum Many-body Scars
Hongzheng Zhao, Adam Smith, Florian Mintert +1
Quantum many-body scars have been put forward as counterexamples to the Eigenstate Thermalization Hypothesis. These atypical states are observed in a range of correlated models as…
Rigorous Bounds on the Heating Rate in Thue-Morse Quasiperiodically and Randomly Driven Quantum Many-Body Systems
Takashi Mori, Hongzheng Zhao, Florian Mintert +2
The nonequilibrium quantum dynamics of closed many-body systems is a rich yet challenging field. While recent progress for periodically driven (Floquet) systems has yielded a numbe…
Random multipolar driving: tunably slow heating through spectral engineering
Hongzheng Zhao, Florian Mintert, Roderich Moessner +1
Driven quantum systems may realize novel phenomena absent in static systems, but driving-induced heating can limit the time-scale on which these persist. We study heating in intera…
Quantum Many-Body Scars in Optical Lattices
Hongzheng Zhao, Joseph Vovrosh, Florian Mintert +1
The concept of quantum many-body scars has recently been put forward as a route to describe weak ergodicity breaking and violation of the Eigenstate Thermalization Hypothesis. We p…
Engineered Nearest-Neighbour Interactions with Doubly Modulated Optical Lattices
Hongzheng Zhao, Johannes Knolle, Florian Mintert
Optical lattice systems provide exceptional platforms for quantum simulation of many-body systems. We focus on the doubly modulated Bose-Hubbard model driven by both time-dependent…
Floquet Time Spirals and Stable Discrete Time Quasi-Crystals in Quasi-Periodically Driven Quantum Many-Body Systems
Hongzheng Zhao, Florian Mintert, Johannes Knolle
We analyse quasi-periodically driven quantum systems that can be mapped exactly to periodically driven ones and find Floquet Time Spirals in analogy with spatially incommensurate s…