Scientists demonstrate all-fiber quantum logic

May 28, 2009
This is an image of a photonic crystal fiber. Credit: Alex Clark

A team of physicists and engineers have demonstrated all-fibre quantum logic, where single photons are generated and used to perform the controlled-NOT quantum logic gate in optical fibres with high fidelity.

The only quantum technology in practical use today is 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 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 could be used in less mature quantum technologies such as computing, communication and advanced measurement, as well as in the fundamental science of .

More information: The team reported its results in the March 2009 issue of Physical Review A (Vol 79, No 3).

‘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. link.aps.org/abstract/PRA/v79/e030303

Source: University of Bristol (news : web)

Explore further: Photonic quantum technologies could be only light years away

Related Stories

Silicon chips for optical quantum technologies

March 27, 2008

A team of physicists and engineers has demonstrated exquisite control of single particles of light – photons – on a silicon chip to make a major advance towards the long sought after goal of a super-powerful quantum computer.

Recommended for you

Uncovering the secrets of water and ice as materials

December 7, 2016

Water is vital to life on Earth and its importance simply can't be overstated—it's also deeply rooted within our conscience that there's something extremely special about it. Yet, from a scientific point of view, much remains ...

Blocks of ice demonstrate levitated and directed motion

December 7, 2016

Resembling the Leidenfrost effect seen in rapidly boiling water droplets, a disk of ice becomes highly mobile due to a levitating layer of water between it and the smooth surface on which it rests and melts. The otherwise ...

The case for co-decaying dark matter

December 5, 2016

(Phys.org)—There isn't as much dark matter around today as there used to be. According to one of the most popular models of dark matter, the universe contained much more dark matter early on when the temperature was hotter. ...

3 comments

Adjust slider to filter visible comments by rank

Display comments: newest first

ShotmanMaslo
not rated yet May 28, 2009
cool..
NeilFarbstein
1 / 5 (1) May 28, 2009
really cool
SincerelyTwo
not rated yet May 29, 2009
i like the picture

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.