In order to be able to carry out useful arithmetic operations, quantum gates are required, for example optical components such as mirrors, lens and optical fibers. Light particles prepared in a certain manner which serve as carriers of quantum information can be manipulated on them.
"In standard quantum computers, one prepares the data so that it has zeros and ones at the same time. Then my device comes which manipulates the whole thing i.e. my gates which do something in sequence. And then comes my output, I mean the results”, explains Philip Walther of the University of Vienna. The idea was to construct a machine enabling the superimposition of the quantum gates. This would mean that the light particles do not know whether the state is “zero” or “one”, or which path they have to take through the quantum computer.
The researchers put these ideas into practice by developing a small prototype in the laboratory. Now the task is to increase the number of superimposed gates and to find out for which demands the new concept is most appropriately suited.
Service: The publication on the Internet: http://dx.doi.org/10.1038/ncomms8913