Editorials in 2017

The exploitation of non-Hermitian quantum physics concepts in classical photonics has spawned much research activity during 2017. We conclude the year with a focus issue on parity–time symmetry and concepts with overlapping goals, in particular topological and non-reciprocal photonics.

The Nobel Prize-winning observation of gravitational waves has required laser interferometry to be pushed to extreme limits of sensitivity.

The opening of the superconducting European X-ray free-electron laser in Hamburg, Germany provides exciting opportunities for exploring a completely new world of science.

More than half a century after describing interference of discrete states with a continuum, Ugo Fano's work is as relevant as ever. And Fermi beat him to it.

The International Day of Light, which will be held on 16 May every year, is a day for celebrating and highlighting the importance of light.

The official opening of the SESAME synchrotron in Jordan on 16 May marked an important landmark for science in the Middle East. It is also set to become the world's first solar-powered accelerator.

Ronald Drever may be most famous for co-founding the LIGO project and his gravitational-wave research, but his contributions to laser stabilization have had broad impact on the photonics community.

Excitement over positive industry forecasts, high attendance and a quality programme was dampened by travel restrictions to the United States.

Lasers play a pivotal role in photonics, but claims of lasing are not always as robust and informative as they should be. A new trial policy at Nature Photonics aims to rectify this shortcoming.

As Nature Photonics turns 10 years old, we reflect on how times have changed and offer a message of thanks to our authors, reviewers and readers.