Quantum imaging is a multifaceted field of research that promises highly efficient imaging in
extreme spectral ranges as well as ultralow‐light microscopy. Since the first proof‐of …

This report on progress explores recent advances in our theoretical and experimental
understanding of the physics of open quantum systems (OQSs). The study of such systems …

The concepts and ideas of coherent, nonlinear and quantum optics have been extended to
photon energies in the range of 10–100 kiloelectronvolts, corresponding to soft γ-ray …

We present an experimental demonstration of a stable, low-loss, large X-ray cavity operating
at 1.2 Å wavelength. The cavity consists of four separate high-reflectivity single crystal …

Conspectus Optical cavities have been established as a powerful platform for manipulating
the spectroscopy and photophysics of molecules. Molecules placed inside an optical cavity …

Despite tremendous progress in x-ray free-electron laser (FEL) science over the last decade,
future applications still demand fully coherent, stable x rays that have not been …

Coherent control of quantum dynamics is key to a multitude of fundamental studies and
applications. In the visible or longer-wavelength domains, near-resonant light fields have …

Entangled photons exhibit non-classical light–matter interactions that create new
opportunities in materials and molecular science. Notably, in entangled two-photon …

We present an x-ray regenerative amplifier free-electron laser design capable of producing
fully coherent hard x-ray pulses across a broad tuning range at a high steady state repetition …

Attosecond spectroscopy comprises several techniques to probe matter through electrons
and photons. One frontier of attosecond methods is to reveal complex phenomena arising …