Mechanisms for the emergence of Gaussian correlations

  title={Mechanisms for the emergence of Gaussian correlations},
  author={Marek Gluza and Thomas Schweigler and Mohammadamin Tajik and Jo{\~a}o Sabino and Federica Cataldini and Frederik M{\o}ller and S. Ji and Bernhard Rauer and J{\"o}rg Schmiedmayer and Jens Eisert and Spyros Sotiriadis},
  journal={SciPost Physics},
We comprehensively investigate two distinct mechanisms leading to memory loss of non-Gaussian correlations after switching off the interactions in an isolated quantum system undergoing out-of-equilibrium dynamics. The first mechanism is based on spatial scrambling and results in the emergence of locally Gaussian steady states in large systems evolving over long times. The second mechanism, characterized as `canonical transmutation', is based on the mixing of a pair of canonically conjugate… 
1 Citations

Experimental Observation of Curved Light-Cones in a Quantum Field Simulator

We investigate signal propagation in a quantum field simulator of the Klein-Gordon model realized by two strongly coupled parallel one-dimensional quasi-condensates. By measuring local phononic fields



Decay and recurrence of non-Gaussian correlations in a quantum many-body system

This work presents the first experimental observation of such a dynamical emergence of Gaussian correlations in a quantum many-body system under non-interacting dynamics, and points to a natural way for Gaussian models to emerge in a wide class of (microscopically interacting) quantumMany-body systems.

Memory-preserving equilibration after a quantum quench in a one-dimensional critical model

One of the fundamental principles of statistical physics is that only partial information about a system's state is required for its macroscopic description. This is not only true for thermal

Correlations and dynamics of tunnel-coupled one-dimensional Bose gases

We present a series of experiments performed with two ultracold one-dimensional Bose gases (rubidium atoms) in a double well potential. Employing matter-wave interference, we can measure the

Equilibration in one-dimensional quantum hydrodynamic systems

We study quench dynamics and equilibration in one-dimensional quantum hydrodynamics, which provides effective descriptions of the density and velocity fields in gapless quantum gases. We show that

Probing quantum and thermal noise in an interacting many-body system

The probabilistic character of the measurement process is one of the most puzzling and fascinating aspects of quantum mechanics. In many-body systems quantum-mechanical noise reveals non-local

Thermalization and its mechanism for generic isolated quantum systems

It is demonstrated that a generic isolated quantum many-body system does relax to a state well described by the standard statistical-mechanical prescription, and it is shown that time evolution itself plays a merely auxiliary role in relaxation, and that thermalization instead happens at the level of individual eigenstates, as first proposed by Deutsch and Srednicki.

Correlation Functions of the Quantum Sine-Gordon Model in and out of Equilibrium.

It is found that correlations of excited states are markedly different from the thermal case, which can be explained by the integrability of the system.

Emergent Pauli blocking in a weakly interacting Bose gas

The relationship between many-body interactions and dimensionality is integral to numerous emergent quantum phenomena. A striking example is the Bose gas, which upon confinement to one dimension (1D)

Equilibration towards generalized Gibbs ensembles in non-interacting theories

Even after almost a century, the foundations of quantum statistical mechanics are still not completely understood. In this work, we provide a precise account on these foundations for a class of

Recurrences in an isolated quantum many-body system

These findings will enable the study of the coherent dynamics of large quantum systems even after they have reached a transient thermal-like state and demonstrate recurrences of coherence and long-range order in an interacting quantum many-body system containing thousands of particles.