Researchers violate Bell’s inequality with an atom and a photon

Aug 31, 2004
Researchers violate Bell’s inequality with an atom and a photon

Researchers at the University of Michigan have reported the first Bell’s inequality violation measurement of a single entangled atom-photon pair.

Entanglement is a fundamental yet mysterious feature of quantum physics, said David Moehring, a physics graduate student who co-authored the paper entitled, “Experimental Bell Inequality Violation with an Atom and a Photon,” which appeared in Physical Review Letters this month.

Entanglement is a quantum mechanical phenomenon in which the quantum states of two or more objects must be described as a single inseparable entity, even though the objects may be spatially separated.

Quantum entanglement is demonstrated by inserting experimental results into a mathematical inequality called Bell’s inequality. If the results violate the inequality, entanglement has been demonstrated, and the results support the non-locality of quantum mechanics.

Non-locality means that even though particles are separated, they are considered one unit. When acting on one part you affect the other part instantaneously, as opposed to the amount of time needed for information to travel at the speed of light as is necessary.

The entangled hybrid system represents a step toward realizing quantum computing because of the way the two particles work together, Moehring said.

Ions can hold information for a long time, acting as storage, which is necessary to retrieve data from a quantum computer. Photons, on the other hand, travel extremely fast, and it is therefore very difficult to store a photon’s data. So, the photons represent the communication channel, and the ions represent the memory.

“We combined the two particles and we used the best that each had to offer,” said Moehring.

The recent paper advances research first published by physics professor Chris Monroe’s group, which includes Moehring, in the March edition of Nature. That paper discussed the first observation of entanglement of a photon and an atom.

For information on the trapped ion quantum computing lab, see: http: //iontrap.physics.lsa.umich.edu/

Source: University of Michigan

Explore further: Nanoionics: A versatile system for constructing ion-conducting channels on monolayers

Related Stories

Ears, grips and fists take on mobile phone user ID

7 hours ago

A research project has been under way to explore a biometric authentication system dubbed Bodyprint, with interesting test results. Bodyprint has been designed to detect users' biometric features using the ...

More than 2,200 confirmed dead in Nepal earthquake

7 hours ago

A powerful aftershock shook Nepal on Sunday, making buildings sway and sending panicked Kathmandu residents running into the streets a day after a massive earthquake left more than 2,200 people dead.

Magnitude 6.7 aftershock hits Nepal, causes panic

8 hours ago

A powerful aftershock shook Nepal on Sunday, making buildings sway and sending panicked Kathmandu residents running into the streets a day after a massive earthquake left at least 1,900 people dead.

Nepal quake: Nearly 1,400 dead, Everest shaken (Update)

18 hours ago

Tens of thousands of people were spending the night in the open under a chilly and thunderous sky after a powerful earthquake devastated Nepal on Saturday, killing nearly 1,400, collapsing modern houses and ...

Recommended for you

A new wrinkle for cell culture

Apr 23, 2015

Using a technique that introduces tiny wrinkles into sheets of graphene, researchers from Brown University have developed new textured surfaces for culturing cells in the lab that better mimic the complex ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

jonnyboy
3 / 5 (2) Apr 10, 2009
"When acting on one part you affect the other part instantaneously, as opposed to the amount of time needed for information to travel at the speed of light as is necessary."

In other words, the firburtz, when connected to the listangg generates a field that is non-localized in this space time continuum

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.