Physicists study remote quantum networks

Nov 01, 2006

U.S. physicists say the operations of two remote quantum systems can be synchronized so changes in one system are conditional on what occurs in the other.

The research team led by Jeff Kimble of the California Institute of Technology says the synchronization provides a level of real-time control that hasn't previously been achieved.

Quantum networking plays a key role in a series of proposed quantum communication and information schemes that hold promise for secure information exchange, as well as the ability to solve certain tasks faster than any classical computer.

A practical quantum network requires synchronized operations to be performed on states stored in separated nodes. The authors address the specific task of producing a pair of identical photons from two quantum nodes. They make one node ready for emitting a single photon, but, before actually releasing the particle, wait for the other node to be ready.

That method, the researchers said, significantly increases the probability that two photons are fired simultaneously, when compared with a situation without such conditional control.

The physicists say they believe their technique could have important implications for the development of quantum networks.

The research appears in the journal Nature Physics.

Copyright 2006 by United Press International

Explore further: Information storage for the next generation of plastic computers

add to favorites email to friend print save as pdf

Related Stories

A quantum logic gate between light and matter

Apr 10, 2014

Scientists at Max Planck Institute of Quantum Optics, Garching, Germany, successfully process quantum information with a system comprising an optical photon and a trapped atom.

Hydrogen atoms under the magnifying glass

May 22, 2013

To describe the microscopic properties of matter and its interaction with the external world, quantum mechanics uses wave functions, whose structure and time dependence is governed by the Schrödinger equation. ...

Recommended for you

Better thermal-imaging lens from waste sulfur

13 hours ago

Sulfur left over from refining fossil fuels can be transformed into cheap, lightweight, plastic lenses for infrared devices, including night-vision goggles, a University of Arizona-led international team ...

How to test the twin paradox without using a spaceship

Apr 16, 2014

Forget about anti-ageing creams and hair treatments. If you want to stay young, get a fast spaceship. That is what Einstein's Theory of Relativity predicted a century ago, and it is commonly known as "twin ...

User comments : 0

More news stories

Better thermal-imaging lens from waste sulfur

Sulfur left over from refining fossil fuels can be transformed into cheap, lightweight, plastic lenses for infrared devices, including night-vision goggles, a University of Arizona-led international team ...

Male monkey filmed caring for dying mate (w/ Video)

(Phys.org) —The incident was captured by Dr Bruna Bezerra and colleagues in the Atlantic Forest in the Northeast of Brazil.  Dr Bezerra is a Research Associate at the University of Bristol and a Professor ...