All Outputs (89)

Topographic Control of Order in Quasi-2D Granular Phase Transitions (2021)
Journal Article

We experimentally investigate the nature of 2D phase transitions in a quasi-2D granular fluid. Using a surface decorated with periodically spaced dimples we observe interfacial tension between coexisting granular liquid and crystal phases. Measuremen... Read More about Topographic Control of Order in Quasi-2D Granular Phase Transitions.

Reinforcement learning of rare diffusive dynamics (2021)
Journal Article

We present a method to probe rare molecular dynamics trajectories directly using reinforcement learning. We consider trajectories that are conditioned to transition between regions of configuration space in finite time, such as those relevant in the... Read More about Reinforcement learning of rare diffusive dynamics.

Solvable class of non-Markovian quantum multipartite dynamics (2021)
Journal Article

We study a class of multipartite open quantum dynamics for systems with an arbitrary number of qubits. The non-Markovian quantum master equation can involve arbitrary single or multipartite and time-dependent dissipative coupling mechanisms, expresse... Read More about Solvable class of non-Markovian quantum multipartite dynamics.

Theory of classical metastability in open quantum systems (2021)
Journal Article

We present a general theory of classical metastability in open quantum systems. Metastability is a consequence of a large separation in timescales in the dynamics, leading to the existence of a regime when states of the system appear stationary, befo... Read More about Theory of classical metastability in open quantum systems.

Large Deviations at Level 2.5 for Markovian Open Quantum Systems: Quantum Jumps and Quantum State Diffusion (2021)
Journal Article

We consider quantum stochastic processes and discuss a level 2.5 large deviation formalism providing an explicit and complete characterisation of fluctuations of time-averaged quantities, in the large-time limit. We analyse two classes of quantum sto... Read More about Large Deviations at Level 2.5 for Markovian Open Quantum Systems: Quantum Jumps and Quantum State Diffusion.

Symmetry-induced fluctuation relations in open quantum systems (2021)
Journal Article

We derive a general scheme to obtain quantum fluctuation relations for dynamical observables in open quantum systems. For concreteness, we consider Markovian nonunitary dynamics that is unraveled in terms of quantum jump trajectories and exploit tech... Read More about Symmetry-induced fluctuation relations in open quantum systems.

Optimal sampling of dynamical large deviations via matrix product states (2021)
Journal Article

The large deviation statistics of dynamical observables is encoded in the spectral properties of deformed Markov generators. Recent works have shown that tensor network methods are well suited to compute accurately the relevant leading eigenvalues an... Read More about Optimal sampling of dynamical large deviations via matrix product states.

A reinforcement learning approach to rare trajectory sampling (2021)
Journal Article

Very often when studying non-equilibrium systems one is interested in analysing dynamical behaviour that occurs with very low probability, so called rare events. In practice, since rare events are by definition atypical, they are often difficult to a... Read More about A reinforcement learning approach to rare trajectory sampling.

Exact solution of the Floquet-PXP cellular automaton (2020)
Journal Article

We study the dynamics of a bulk deterministic Floquet model, the Rule 201 synchronous one-dimensional reversible cellular automaton (RCA201). The system corresponds to a deterministic, reversible, and discrete version of the PXP model, whereby a site... Read More about Exact solution of the Floquet-PXP cellular automaton.

Matrix product state of multi-time correlations (2020)
Journal Article

For an interacting spatio-temporal lattice system we introduce a formal way of expressing multi-time correlation functions of local observables located at the same spatial point with a time state, i.e. a statistical distribution of configurations obs... Read More about Matrix product state of multi-time correlations.

Symmetry-induced fluctuation relations for dynamical observables irrespective of their behavior under time reversal (2020)
Journal Article

We extend previous work to describe a class of fluctuation relations (FRs) that emerge as a consequence of symmetries at the level of stochastic trajectories in Markov chains. We prove that given such a symmetry, and for a suitable dynamical observab... Read More about Symmetry-induced fluctuation relations for dynamical observables irrespective of their behavior under time reversal.

Nonequilibrium Quantum Many-Body Rydberg Atom Engine (2020)
Journal Article

The standard approach to quantum engines is based on equilibrium systems and on thermo-dynamic transformations between Gibbs states. However, non-equilibrium quantum systems offer enhanced experimental flexibility in the control of their parameters a... Read More about Nonequilibrium Quantum Many-Body Rydberg Atom Engine.

Classical stochastic discrete time crystals (2019)
Journal Article

© 2019 American Physical Society. We describe a general and simple paradigm for discrete time crystals (DTCs), systems with a stable subharmonic response to an external driving field, in a classical thermal setting. We consider, specifically, an Isin... Read More about Classical stochastic discrete time crystals.

Using matrix product states to study the dynamical large deviations of kinetically constrained models (2019)
Journal Article

Here we demonstrate that tensor network techniques | originally devised for the analysis of quantum many-body problems | are well suited for the detailed study of rare event statistics in kinetically constrained models (KCMs). As concrete examples we... Read More about Using matrix product states to study the dynamical large deviations of kinetically constrained models.

Theory for Glassy Behavior of Supercooled Liquid Mixtures (2019)
Journal Article

We present a model for glassy dynamics in supercooled liquid mixtures. Given the relaxation behavior of individual supercooled liquids, the model predicts the relaxation times of their mixtures as temperature is decreased. The model is based on dynam... Read More about Theory for Glassy Behavior of Supercooled Liquid Mixtures.

Accelerated relaxation and suppressed dynamic heterogeneity in a kinetically constrained (East) model with swaps (2019)
Journal Article

We introduce a kinetically constrained spin model with a local softness parameter, such that spin flips can violate the kinetic constraint with an (annealed) site-dependent rate. We show that adding MC swap moves to this model can dramatically accele... Read More about Accelerated relaxation and suppressed dynamic heterogeneity in a kinetically constrained (East) model with swaps.

Exact large deviation statistics and trajectory phase transition of a deterministic boundary driven cellular automaton (2019)
Journal Article

We study the statistical properties of the long-time dynamics of the rule 54 reversible cellular automaton (CA), driven stochastically at its boundaries. This CA can be considered as a discrete-time and deterministic version of the Fredrickson-Anders... Read More about Exact large deviation statistics and trajectory phase transition of a deterministic boundary driven cellular automaton.

Strong zero modes in a class of generalized Ising spin ladders with plaquette interactions (2019)
Journal Article

© 2019 American Physical Society. We study a class of spin-1/2 quantum ladder models with generalized plaquette interactions in the presence of a transverse field. We show that in certain parameter regimes, these models have strong zero modes respons... Read More about Strong zero modes in a class of generalized Ising spin ladders with plaquette interactions.

Physical swap dynamics, shortcuts to relaxation, and entropy production in dissipative Rydberg gases (2019)
Journal Article

Dense Rydberg gases are out-of-equilibrium systems where strong density-density interactions give rise to effective kinetic constraints. They cause dynamic arrest associated with highly constrained many-body configurations, leading to slow relaxation... Read More about Physical swap dynamics, shortcuts to relaxation, and entropy production in dissipative Rydberg gases.

Ordering, Flexibility and Frustration in Arrays of Porphyrin Nanorings (2019)
Journal Article

The regular packing of atoms, molecules and nanoparticles provides the basis for the understanding of structural order within condensed phases of matter. Typically the constituent particles are considered to be rigid with a fixed shape. Here we show,... Read More about Ordering, Flexibility and Frustration in Arrays of Porphyrin Nanorings.