We report on our recent experiments performed with cold atoms strongly coupled to a single mode of a high-finesse optical cavity. We demonstrate an optical bistability between two hyperfine ground states of the atoms.

What is a physical subsystem? How classical physical subsystems localized in spacetime (causally independent) are identified from quantum ones?

In this talk we give a basic overview of the rich mathematical theory of redundant representations, i.e. frame theory, and its connection to disciplines outside mathematics (mentioned in the title).

Doubly-clamped nanostring resonators excel as high Q nanomechanical systems enabling room temperature quality factors of several 100,000 in the 10 MHz eigenfrequency range. Dielectric transduction via electrically induced gradient fields provides an…

No-go theorems (Bell, Kochen–Specker, …) formally show the departure of quantum theory from the classical worldview. These are formulated in the framework of ontological models and, if one accepts such framework, entail that quantum theory involves…

Mechanical resonators are great platform to explore mesoscopic physics of vibrations (phonons) in nonequilibrium and nonlinear regime.

Quantum theory has an epistemic horizon, i.e. exact values cannot be assigned simultaneously to incompatible physical quantities. As shown by Spekkens' toy theory, positing an epistemic horizon akin to Heisenberg's uncertainty principle in a…

A Planck scale inflationary era—in a quantum gravity theory predicting discreteness of quantum geometry at the fundamental scale—is compatible with observed features in the cosmic microwave background and allows for a hotter big bang which could…

While the action-reaction principle dictates all fundamental physical interactions, the dynamics we effectively observe in complex nonequilibrium systems ubiquitously breaks reciprocity, giving rise to intriguing new physical phenomena.

The Localizability Problem addresses the absence of a theoretical counterpart to the position observable in relativistic quantum systems.