It looks like quantum computing could now be one step closer to some form of practicality, as a team of researchers from the University of Queensland have announced that they've created a light-based quantum circuit that's capable of performing basic calculations. According to ZDNET Australia, that was done by using a laser to send "entangled" photons through a linear optical circuit, which allowed them to create a circuit consisting of four "qubits," (or quantum bits, pictured at right), which in turn allowed them to calculate the prime roots of fifteen, three and five. Somewhat interestingly, the university's research is funded in part by none other than DARPA, which the researchers themselves admit may be due to the technology's potential for cracking otherwise uncrackable codes.

[Via Slashdot, image courtesy of Wikimedia Commons]

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Researchers create light-based quantum circuit that does math