Press release issued 28 May 2009
The only quantum technology in practical use today is quantum cryptography and is currently limited in the distance over which secure communication may occur.
More sophisticated quantum networks will require multiple nodes with the ability to implement small-scale quantum processing in order to increase the range of quantum communications. Such networks will rely on optical fibre links, making fibre-based photon generation and information processing of key technological importance.
Jeremy O’Brien, Professor of Physics and Electrical Engineering at Bristol University and colleagues, have shown it is possible for a high-fidelity fibre controlled-NOT gate to operate with fibre heralded single-photon sources.
Professor O’Brien speaking about the research, said: “On the basis of a simple model we are able to conclude that imperfections are primarily due to the photon sources, meaning that the gate itself works with very high fidelity.”
“Such all fibre quantum information processing will likely have important applications in future quantum networks.”
All-fibre quantum information processing could be used in less mature quantum technologies such as computing, communication and advanced measurement, as well as in the fundamental science of quantum optics.
The team reported its results in the March 2009 issue of Physical Review A (Vol 79, No 3).
Please contact Joanne Fryer for further information.
‘All-optical-fiber polarization-based quantum logic gate’, Alex S. Clark, Jérémie Fulconis, John G. Rarity, William J. Wadsworth, and Jeremy L. O‘Brien, Physical Review A (Volume 79, No 3), published 26 March 2009.
For further information go to the University of Bristol’s Centre for Quantum Photonics
Such all fibre quantum information processing will likely have important applications in future quantum networks.