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Quasiparticle engineering and entanglement propagation in a quantum many-body system
TLDR
First, the entanglement distributed by quasiparticles as they trace out light-cone-like wavefronts is observed, and second, using the ability to tune the interaction range in the system, information propagation is observed in an experimental regime where the effective-light-cone picture does not apply.
Real-time dynamics of lattice gauge theories with a few-qubit quantum computer
TLDR
This work reports the experimental demonstration of a digital quantum simulation of a lattice gauge theory, by realizing (1 + 1)-dimensional quantum electrodynamics (the Schwinger model) on a few-qubit trapped-ion quantum computer and explores the Schwinger mechanism of particle–antiparticle generation by monitoring the mass production and the vacuum persistence amplitude.
A quantum annealing architecture with all-to-all connectivity from local interactions
TLDR
This work presents a scalable architecture with full connectivity, which can be implemented with local interactions only, and can be understood as a lattice gauge theory, where long-range interactions are mediated by gauge constraints.
Many-body localization in a quantum simulator with programmable random disorder
Interacting quantum systems are expected to thermalize, but in some situations in the presence of disorder they can exist in localized states instead. This many-body localization is studied
Measuring multipartite entanglement via dynamic susceptibilities
Entanglement plays a central role in our understanding of quantum many body physics, and is fundamental in characterising quantum phases and quantum phase transitions. Developing protocols to detect
Tomography of band insulators from quench dynamics.
TLDR
A simple scheme for tomography of band-insulating states in one- and two-dimensional optical lattices with two sublattice states that maps out the Berry curvature in the entire Brillouin zone and extracts topological invariants such as the Chern number is proposed.
Can one trust quantum simulators?
TLDR
It is found that disorder can decrease the reliability of an analog quantum simulator of this model, although large errors in local observables are introduced only for strong levels of disorder.
Relating Out-of-Time-Order Correlations to Entanglement via Multiple-Quantum Coherences.
TLDR
It is formally demonstrated that the multiple-quantum coherence spectra, a specific family of OTOCs well known in NMR, can be used as an entanglement witness and as a direct probe of multiparticle entanglements.
Measuring multipartite entanglement through dynamic susceptibilities
Philipp Hauke, 2, ∗ Markus Heyl, 2, 3 Luca Tagliacozzo, 5 and Peter Zoller 2 Institute for Theoretical Physics, University of Innsbruck, 6020 Innsbruck, Austria Institute for Quantum Optics and
Direct Observation of Dynamical Quantum Phase Transitions in an Interacting Many-Body System.
TLDR
This work investigates and measures dynamical quantum phase transitions in a string of ions simulating interacting transverse-field Ising models, and establishes a link between DQPTs and the dynamics of other quantities such as the magnetization.
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