ECAMP 15

We report on experiments with highly intense femtosecond laser pulses with tailored polarization to study entanglement of spatially separated atoms on femtosecond time scales.

Previously, it has been shown that circularly polarized light favors electrons with a certain magnetic quantum number in strong field ionization [1]. This preference was used to prepare and detect ring currents in...

X-ray free-electron lasers (XFELs) open new avenues towards studying collective x-ray emission and nonlinear x-ray matter interaction. In this talk I will present recent advancements on the experimental and theoretical exploration of collective spontaneous x-ray emission (x-ray superfluorescence) following ultrafast inner-shell photoinization. X-ray superfluorescence has been demonstrated in...

Chirality—the property of an object that cannot be superimposed on its mirror image—is ubiquitous in nature. Like our hands, opposite versions of the same chiral molecule (R and S enantiomers) behave identically unless they interact with another chiral object. Molecular chirality is rapidly becoming essential in nanotechnology [1], e.g. for developing molecular motors and spintronic devices....

We report precise measurements of inter-species interactions in a bosonic optical lattice clock based on $^{88}$Sr atoms [1]. We observe a nonlinear behavior of the clock density shift, showing features deriving from many-body physics beyond the mean-field theory,even without reaching the quantum degeneracy. This findings enable a cancellation of the density shift systematic effect through a...

Interferometers based on ultracold atoms enable an absolute measurement of inertial forces with unprecedented precision. However, their resolution is fundamentally restricted by quantum fluctuations. Improved resolutions with entangled or squeezed atoms were demonstrated in internal-state measurements for thermal and quantum-degenerate atoms and, recently, for momentum-state interferometers...