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Towards sampling complex actions

Path integrals with complex actions are encountered for many physical systems ranging from spin- or mass-imbalanced atomic gases and graphene to quantum chromo-dynamics at finite density to the non-equilibrium evolution of quantum systems. Many …

Entropic entanglement criteria in phase space

We derive inseparability criteria for the phase space representation of quantum states in terms of variants of Wehrl's entropy. In contrast to entropic criteria involving differential entropies of marginal phase space distributions, our criteria are …

Single-particle localization in a two-dimensional Rydberg spin system

We study excitation transport in a two-dimensional system of randomly assembled spins with power-law hopping in two dimensions. This model can be realized in cold atom quantum simulators with Rydberg atoms. In these experiments, due to the Rydberg …

Detecting entanglement structure in continuous many-body quantum systems

A prerequisite for the comprehensive understanding of many-body quantum systems is a characterization in terms of their entanglement structure. The experimental detection of entanglement in spatially extended many-body systems describable by quantum …

Glassy quantum dynamics of disordered Ising spins

We study out-of-equilibrium dynamics in the quantum Ising model with power-law interactions and positional disorder. For arbitrary dimension d and interaction range α≥d we analytically find a stretched exponential decay with stretch power β=d/α for …

Time-dependent variational principle for open quantum systems with artificial neural networks

We develop a variational approach to simulating the dynamics of open quantum many-body systems using deep autoregressive neural networks. The parameters of a compressed representation of a mixed quantum state are adapted dynamically according to the …

Nonlinear absorption in interacting Rydberg EIT spectra on two-photon resonance

We experimentally investigate the nonlinear transmission spectrum of coherent light fields propagating through a Rydberg-EIT medium with strong atomic interactions. In contrast to previous investigations, which have largely focused on resonant …

Entanglement detection in quantum many-body systems using entropic uncertainty relations

We study experimentally accessible lower bounds on entanglement measures based on entropic uncertainty relations. Experimentally quantifying entanglement is highly desired for applications of quantum simulation experiments to fundamental questions, …

Experimentally accessible bounds on distillable entanglement from entropic uncertainty relations

Entanglement is not only the resource that fuels many quantum technologies but also plays a key role for some of the most profound open questions of fundamental physics. Experiments controlling quantum systems at the single quantum level may shed …

Glassy Dynamics in a Disordered Heisenberg Quantum Spin System