University of Bristol makes quantum chip programming available over the net

Online simulator: http://cnotmz.appspot.com/

examples are in the how-to guide complete with pretty screenshots.

http://www.bristol.ac.uk/physics/research/quantum/qcloud/pro...

Can an optical physicist comment on how the phase-shifting is accomplished? What do they mean by "phase"? (I would have expected this to mean polarization phase, but this chip seems to be based not on polarization but on relative phase shift?)

Also, that CNOT gate is… weird. How can post-selecting scale, if each CNOT gate in the circuit reduces the chance of a successful run by 89%?

Another also, the interpretation of the CNOT gate given in the tutorial seems reversed – photon mode 1 corresponds to control input 1; mode 2 corresponds to control input 0, at least according to the simulator.

It incorrectly binds touch event instead of click events for my PC.

If anyone else runs into this issue, you will need to bind the events from the javascript console:

gc.addEventListener('mousemove', mouseMoved, false); gc.addEventListener('mousedown', mouseDown, false);

>"If quantum computing does become a practical technology, there will be a relatively small number of quantum computers, which people will access remotely."

'I think there is a world market for about five computers.'