Physics – Quantum Physics
Scientific paper
2010-07-15
Nature Photonics, Advance online publication 30 May 2010
Physics
Quantum Physics
24 pages, 4 figures, 1 table
Scientific paper
10.1038/NPHOTON.2010.123
The heralded generation of entangled states is a long-standing goal in quantum information processing, because it is indispensable for a number of quantum protocols. Polarization entangled photon pairs are usually generated through spontaneous parametric down-conversion, but the emission is probabilistic. Their applications are generally accompanied by post-selection and destructive photon detection. Here, we report a source of entanglement generated in an event-ready manner by conditioned detection of auxiliary photons. This scheme benefits from the stable and robust properties of spontaneous parametric down-conversion and requires only modest experimental efforts. It is flexible and allows the preparation efficiency to be significantly improved by using beamsplitters with different transmission ratios. We have achieved a fidelity better than 87% and a state preparation efficiency of 45% for the source. This could offer promise in essential photonics-based quantum information tasks, and particularly in enabling optical quantum computing by reducing dramatically the computational overhead.
Bao Xiao-Hui
Chen Kaiyou
Chen Yu-Ao
Goebel Alexander
Li Che-Ming
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