According to quantum field theory, empty space—the ground state with all real excitations
removed—is not empty, but filled with quantum-vacuum fluctuations. Their presence can …

In many states of the quantum electromagnetic field, including the vacuum state,
entanglement exists between different space-time regions—even spacelike separated ones …

Following recent progress in the experimental application of electro-optic sampling to the
detection of the quantum fluctuations of the electromagnetic-field ground state and …

Over the past few decades, THz technology has made considerable progress, evidenced by
the performance of current THz sources and detectors, as well as the emergence of several …

We revisit the mathematics of exactly solvable Unruh-DeWitt detector models, interacting
with massless scalar fields under instantaneous interactions, to construct a relativistic …

We propose a multichannel version of quantum electro-optic sampling involving
monochromatic field modes. It allows for multiple simultaneous measurements of arbitrarily …

Quantum resources construct new avenues to explore the cosmos. Considering bipartite-
qubit detectors subjected to scalar fields in an expanding spacetime, quantum resources …

Entanglement plays crucial roles in quantum optics, providing a prerequisite for these recent
unprecedented leaps. Nevertheless, the study of quantum entanglement under the influence …

The influence of measurement back action on electro-optic sampling of electromagnetic
quantum fluctuations is investigated. Based on a cascaded treatment of the nonlinear …

Employing a nonperturbative approach based on an instantaneous interaction between a
two-level Unruh-DeWitt detector and a massive scalar field, we investigate the ability of the …