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Published Online March 27, 2008
Science DOI: 10.1126/science.1155441

Reports

Submitted on January 21, 2008
Accepted on March 3, 2008

Silica-on-Silicon Waveguide Quantum Circuits

Alberto Politi 1, Martin J. Cryan 1, John G. Rarity 1, Siyuan Yu 1, Jeremy L. O'Brien 1*

1 Centre for Quantum Photonics, H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol, BS8 1UB, UK.

* To whom correspondence should be addressed.
Jeremy L. O'Brien , E-mail: Jeremy.OBrien{at}bristol.ac.uk

Quantum technologies based on photons will likely require an integrated optics architecture for improved performance, miniaturization, and scalability. We demonstrate high-fidelity silica-on-silicon integrated optical realizations of key quantum photonic circuits, including two-photon quantum interference with a visibility of 94.8 ± 0.5%; a controlled-NOT gate with an average logical basis fidelity of 94.3 ± 0.2%; and a path entangled state of two photons with fidelity of >92%. These results show that it is possible to directly "write" sophisticated photonic quantum circuits onto a silicon chip, which will be of benefit to future quantum technologies based on photons, including information processing, communication, metrology, and lithography, as well as the fundamental science of quantum optics.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Shor's Quantum Factoring Algorithm on a Photonic Chip.
A. Politi, J. C. F. Matthews, and J. L. O'Brien (2009)
Science 325, 1221
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An Entanglement Filter.
R. Okamoto, J. L. O'Brien, H. F. Hofmann, T. Nagata, K. Sasaki, and S. Takeuchi (2009)
Science 323, 483-485
   Abstract »    Full Text »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)