This morning’s Observer column.

For a long time, the world looked upon quantum physicists with a kind of bemused affection. Sure, they might be wacky, but boy, were they smart! And western governments stumped up large quantities of dosh to enable them to build the experimental kit they needed for their investigations. A huge underground doughnut was excavated in the suburbs of Geneva, for example, and filled with unconscionable amounts of heavy machinery in the hope that it would enable the quark-hunters to find the Higgs boson, or at any rate its shadowy tracks.

All of this was in furtherance of the purest of pure science – curiosity-driven research. The idea that this stuff might have any practical application seemed, well, preposterous to most of us. But here and there, there were people who thought otherwise (among them, as it happens, Richard Feynman). In particular, these visionaries wondered about the potential of harnessing the strange properties of subatomic particles for computational purposes. After all, if a particle can be in two different states at the same time (in contrast to a humdrum digital bit, which can only be a one or a zero), then maybe we could use that for speeded-up computing. And so on.

LATER: Gary Marcus has a nice sceptical piece about quantum computing in the New Yorker.

This morning’s Observer column.

Although there are already some very sophisticated applications of 3D printing in industry (in aircraft manufacture, for example), most of the stuff produced by 3D printing in the public domain looks pretty naff to the layperson’s eye. The Texas gun, for example, looks naive and unsophisticated when compared to, say, a Walther PPK. One can just imagine James Bond’s incredulous sneer if Q were to offer it to him.

But for those who have followed the work of Harvard scholar Clayton Christensen over the years, the sheer crudity of the printed object is what rings bells because it evokes the possibility of disruptive change…

LATER: It turns out that the Feds are onto it:

On Thursday, Defense Distributed founder Cody Wilson received a letter from the State Department Office of Defense Trade Controls Compliance demanding that he take down the online blueprints for the 3D-printable “Liberator” handgun that his group released Monday, along with nine other 3D-printable firearms components hosted on the group’s website Defcad.org. The government says it wants to review the files for compliance with arms export control laws known as the International Traffic in Arms Regulations, or ITAR. By uploading the weapons files to the Internet and allowing them to be downloaded abroad, the letter implies Wilson’s high-tech gun group may have violated those export controls.

“Until the Department provides Defense Distributed with final [commodity jurisdiction] determinations, Defense Distributed should treat the above technical data as ITAR-controlled,” reads the letter, referring to a list of ten CAD files hosted on Defcad that include the 3D-printable gun, silencers, sights and other pieces. “This means that all data should be removed from public acces immediately. Defense Distributed should review the remainder of the data made public on its website to determine whether any other data may be similarly controlled and proceed according to ITAR requirements.”