Using an ensemble of atoms in an optical cavity, we engineer a family of nonlocal
Heisenberg Hamiltonians with continuously tunable anisotropy of the spin-spin couplings …

Bell correlations, indicating nonlocality in composite quantum systems, were until recently
only seen in small systems. Here, we demonstrate Bell correlations in squeezed states of 5× …

A complete treatment of open quantum systems made of identical particles has remained
elusive due to the intrinsic problem of these particles being individually unaddressable …

Multiparticle entanglement is of great significance for quantum metrology and quantum
information processing. We present here an efficient scheme for generating stable …

We derive a many-particle entanglement criterion for mixed states using a relation between
single-mode and many-particle nonclassicalities. The criterion relies on the measurement of …

How can we analyze quantum correlations in large and noisy systems without quantum state
tomography? An established method is to measure total angular momenta and employ the …

Atomic sensors, such as atomic clocks and atom interferometers, have to date achieved very
precise measurements of various quantities such as time, acceleration, gravitational fields …

This ongoing Ph. D. thesis presents original research that revolves around the
characterization and preservation of quantum resources in composite quantum systems. In …

We introduce a general scheme to detect various multiparticle entanglement structures from
global non-permutationally invariant observables. In particular, we derive bounds on the …