Real time g monitoring with 100 kHz sampling rate.

We introduce a technique to determine photon correlations of optical light fields in real time. The method is based on ultrafast phase-randomized homodyne detection and allows us to follow the temporal evolution of the second-order correlation function g(0) of a light field. We demonstrate the capabilities of our approach by applying it to a laser diode operated in the threshold region.

Quantum chaos and breaking of all anti-unitary symmetries in Rydberg excitons.

Symmetries are the underlying principles of fundamental interactions in nature. Chaos in a quantum system may emerge from breaking these symmetries. Compared to vacuum, crystals are attractive for studying quantum chaos, as they not only break spatial isotropy, but also lead to novel quasiparticles with modified interactions.