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: The unifying framework of symmetry reveals properties of a broad range of physical systems

add to favorites email to friend print save as pdf

Related Stories

Animals first flex their muscles

3 hours ago

An unusual new fossil discovery of one of the earliest animals on earth may also provide the oldest evidence of muscle tissue – the bundles of cells that make movement in animals possible.

Introducing the multi-tasking nanoparticle

7 hours ago

Kit Lam and colleagues from UC Davis and other institutions have created dynamic nanoparticles (NPs) that could provide an arsenal of applications to diagnose and treat cancer. Built on an easy-to-make polymer, these particles ...

Eta Carinae: Our Neighboring Superstars

7 hours ago

(Phys.org) —The Eta Carinae star system does not lack for superlatives. Not only does it contain one of the biggest and brightest stars in our galaxy, weighing at least 90 times the mass of the Sun, it ...

Recommended for you

What time is it in the universe?

22 hours ago

Flavor Flav knows what time it is. At least he does for Flavor Flav. Even with all his moving and accelerating, with the planet, the solar system, getting on planes, taking elevators, and perhaps even some ...

Watching the structure of glass under pressure

Aug 28, 2014

Glass has many applications that call for different properties, such as resistance to thermal shock or to chemically harsh environments. Glassmakers commonly use additives such as boron oxide to tweak these ...

Inter-dependent networks stress test

Aug 28, 2014

Energy production systems are good examples of complex systems. Their infrastructure equipment requires ancillary sub-systems structured like a network—including water for cooling, transport to supply fuel, and ICT systems ...

Explainer: How does our sun shine?

Aug 28, 2014

What makes our sun shine has been a mystery for most of human history. Given our sun is a star and stars are suns, explaining the source of the sun's energy would help us understand why stars shine. ...

User comments : 0