Quantum technologies exploit entanglement to revolutionize computing, measurements, and
communications. This has stimulated the research in different areas of physics to engineer …

Cold atomic gases have become a paradigmatic system for exploring fundamental physics,
which at the same time allows for applications in quantum technologies. The accelerating …

We use a self-assembled two-dimensional Coulomb crystal of∼ 70 ions in the presence of
an external transverse field to engineer a simulator of the Dicke Hamiltonian, an iconic …

Compared to light interferometers, the flux in cold-atom interferometers is low and the
associated shot noise is large. Sensitivities beyond these limitations require the preparation …

Excited-state quantum phase transitions extend the notion of quantum phase transitions
beyond the ground state. They are characterized by closing energy gaps amid the spectrum …

We study experimentally accessible lower bounds on entanglement measures based on
entropic uncertainty relations. Experimentally quantifying entanglement is highly desired for …

We consider the role of detection noise in quantum-enhanced metrology in collective spin
systems and derive a fundamental bound for the maximum obtainable sensitivity for a given …

We introduce tqix. pis, a library of tqix, for quantum dynamics simulation of spin ensembles.
The library emulates a dynamic process by a quantum circuit, including initializing a …

We consider an antiferromagnetic Bose-Einstein condensate in a transverse magnetic field
with a fixed macroscopic magnetization. The system exhibits two different critical behaviors …

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 …