[FoRK] Bell's Inequality Violation

Jeff Bone jbone at place.org
Tue Aug 31 16:24:39 PDT 2004


	http://www.physorg.com/printnews.php?newsid=1022

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

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




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