Experimental Quantum Cloning of Single Photons

Details Experimental Quantum Cloning of Single Photons Experimental Quantum Cloning of Single Photons

2002-05-23

arxiv.org/abs/quant-ph/0205149v1

Science 296, 712 (2002)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1126/science.1068972

Although perfect copying of unknown quantum systems is forbidden by the laws of quantum mechanics, approximate cloning is possible. A natural way of realizing quantum cloning of photons is by stimulated emission. In this context the fundamental quantum limit to the quality of the clones is imposed by the unavoidable presence of spontaneous emission. In our experiment a single input photon stimulates the emission of additional photons from a source based on parametric down-conversion. This leads to the production of quantum clones with near optimal fidelity. We also demonstrate universality of the copying procedure by showing that the same fidelity is achieved for arbitrary input states.

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