Phys. Rev. A 64, 012315 (2001) [5 pages]Optical realization of universal quantum cloningReceived 22 January 2001; published 13 June 2001 Beyond the no-cloning theorem, the universal symmetric quantum cloning machine was first addressed by Bužek and Hillery. Here, we realized the 1⃗2 qubit Bužek-Hillery cloning machine with linear optical devices. This method relies on the representation of several qubits by a single photon. We showed that the fidelities between the two output qubits and the original qubit are both 5/6 (which proved to be the optimal fidelity of 1⃗2 qubit universal cloner) for arbitrary input pure states. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.64.012315
DOI:
10.1103/PhysRevA.64.012315
PACS:
03.67.-a, 03.65.Ta
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