The above image is ‘the set of bell-diagonal states in a coordinate system where the corner of the tetrahedron lie in four corners of a cube.’ It is from today’s homepage of Quantiki, a website about quantum information from the University of Cambridge. The ‘about’ page of this participatory science project explains:

Quantiki is currently an experimental project hosted by the University of Cambridge’s Centre for Quantum Computation. The intention is to provide an encyclopedia for quantum information that can be edited by the community (a wiki).

Participation is encouraged from both specialists and amateurs, and anyone can edit entries. We hope to create a resource that can serve the interested public, students, and experts. While quantiki aims to be more specialised than corresponding entries in the Wikipedia, we hope that the two projects will reinforce each other.

The name is (clearly) derived from a combination of “quantum” and “wiki”, playing on Contiki, the name of a boat and a book about the expedition made with the boat. Hopefully we’ll have an exciting voyage with this, but one that doesn’t end up crashing!