[FoRK] Bell's Inequality Violation
jbone at place.org
Tue Aug 31 16:24:39 PDT 2004
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
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:
Source: University of Michigan
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