This is a rather astounding result. The authors have managed to cause deuterons-deuterons fusion in an array of nanowires via igniting it using only joule-level pulsed laser, i.e. not using the huge, gigantic lasers such as that as the National Ignition Facility.
This is an open-access paper and you can get the full version at this link.
And no, before you jump all over this one and think that this is the next fusion power generator, you need to think again. The authors are touting this as a viable (and cheaper) ultra-fast pulsed neutron source, which can be useful in many applications and studies.
 A. Curtis et al., Nature Communnications DOI: 10.1038/s41467-018-03445-