Theory and Experiment

Chalmers University of Technology

The Optical Telecommunications Group (GTO) is home to the research programs of six faculty members and a state-of-the-art laboratory on optical fiber transmission. We conduct advanced research in high-rate fiber-optic transmission, optical network architectures, advanced lasers for communications, integrated photonics, and distributed optical fiber sensors.

Ultrafast manipulation of coherent phases by long-wavelength photoexcitation

The photoexcitation within time windows shorter than the characteristic times of the relaxation processes drives matter into highly off-equilibrium transient regimes characterized by anomalous energy distribution between electrons, ions, and spins. This can strongly perturb the interaction among the different degrees of freedom and thereby results in the formation of metastable “phases”, not always reachable under quasi-equilibrium adiabatic transformations.

Low-temperature atomic systems manifest phenomena that are strikingly different from classical mechanics. Quantum mechanics implies that energy levels are discrete and this is the foundation of the current definition of the second.

Accuracy and precision of optical clocks are entering a regime where not only single-atom quantum mechanics is crucial, but also quantum many-body phenomena play a relevant role. When going beyond mean-field or perturbative theoretical approaches, their study generically requires massively parallel computation on HPC resources.


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