Four qubits quantum computer

http://www.zdnet.com.au/news/hardware/soa/Light-based-quantum-circuit-does-basic-maths/0,130061702,339284517,00.htm

The quantum circuit pioneered by the Queensland researchers involves using a laser to send “entangled” photons through a linear optical circuit, White explained. Using this technology the group was able to create a circuit involving four qubits, which allowed them to calculate the prime roots of fifteen, three and five — such calculations will eventually be used to crack common data encryption keys.

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