State-of-the-art atomic clocks are based on the precise detection of the energy difference
between two atomic levels, which is measured in terms of the quantum phase accumulated …

Optical atomic clocks are a driving force for precision measurements due to the high
accuracy and stability demonstrated in recent years. While further improvements to the …

Coherent control of high–quality factor optical transitions in atoms has revolutionized
precision frequency metrology. Leading optical atomic clocks rely on the interrogation of …

The unprecedented stability and accuracy of optical atomic clocks extend their role not only
in frequency metrology but also in fundamental physics and geodesy. In particular, excellent …

Superradiant lasers operate in the bad-cavity regime, where the phase coherence is stored
in the spin state of an atomic medium rather than in the intracavity electric field. Such lasers …

When an inverted ensemble of atoms is tightly packed on the scale of its emission
wavelength or when the atoms are collectively strongly coupled to a single cavity mode, their …

Large atomic ensembles coupled to a single optical resonator mode can be steered to
strongly enhanced or suppressed collective emission via phase controlled excitation …

We realize a two-stage, hexagonal pyramid magneto-optical trap (MOT) with strontium, and
demonstrate loading of cold atoms into cavity-enhanced 1D and 2D optical lattice traps, all …

We demonstrate the direct quantum nondemolition detection of a millihertz linewidth optical
atomic transition. We observe the modification of the phase and amplitude of a probe field …

Some 50 years ago, physicists, and after them the entire world, started to found their time
reference on atomic properties instead of motions of the Earth that have been in use since …