Physics – Quantum Physics
Scientific paper
2004-04-22
Phys. Rev. Lett. 94, 030501 (2005)
Physics
Quantum Physics
4 pages, 4 figures, submitted
Scientific paper
10.1103/PhysRevLett.94.030501
Universal logic gates for two quantum bits (qubits) form an essential ingredient of quantum information processing. However, the photons, one of the best candidates for qubits, suffer from the lack of strong nonlinear coupling required for quantum logic operations. Here we show how this drawback can be overcome by reporting a proof-of-principle experimental demonstration of a non-destructive controlled-NOT (CNOT) gate for two independent photons using only linear optical elements in conjunction with single-photon sources and conditional dynamics. Moreover, we have exploited the CNOT gate to discriminate all the four Bell-states in a teleportation experiment.
Chen Yu-Ao
Du Jiangfeng
Pan Jian-Wei
Yang Tao
Zhang An-Ning
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