Quantum Entanglement - The Weirdness Of Quantum Mechanics
Ανέβηκε στις 13 Φεβ 2010
http://www.facebook.com/ScienceReason ... Quantum Mechanics (Chapter 6): Quantum Entanglement - The Weirdness Of Quantum Mechanics.
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Quantum
entanglement, also called the quantum non-local connection, is a
property of a quantum mechanical state of a system of two or more
objects in which the quantum states of the constituting objects are
linked together so that one object can no longer be adequately described
without full mention of its counterpart—even if the individual objects
are spatially separated in a spacelike manner.
The property of
entanglement was understood in the early days of quantum theory,
although not by that name. Quantum entanglement is at the heart of the
EPR paradox developed by Albert Einstein, Boris Podolsky, and Nathan
Rosen in 1935. This interconnection leads to non-classical correlations
between observable physical properties of remote systems, often referred
to as nonlocal correlations.
Quantum mechanics holds that
observables, for example spin, are indeterminate until some physical
intervention is made to measure an observable of the object in question.
In the singlet state of two spin, it is equally likely that any given
particle will be observed to be spin-up or spin-down.
Measuring
any number of particles will result in an unpredictable series of
measurements that will tend to a 50% probability of the spin being up or
down. However, the results are quite different if this experiment is
done with entangled particles. For example, when two members of an
entangled pair are measured, their spin measurement results will be
correlated.
Two (out of infinitely many) possibilities are that
the spins will be found to always have opposite spins (in the
spin-anti-correlated case), or that they will always have the same spin
(in the spin-correlated case). Measuring one member of the pair
therefore tells you what spin the other member would have if it were
also measured. The distance between the two particles is irrelevant.
• http://en.wikipedia.org/wiki/Quantum_...
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Cassiopeia Project is an effort to make high quality science videos
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Please SUBSCRIBE to Science & Reason:
• http://www.youtube.com/Best0fScience
• http://www.youtube.com/ScienceTV
• http://www.youtube.com/FFreeThinker
---
Quantum
entanglement, also called the quantum non-local connection, is a
property of a quantum mechanical state of a system of two or more
objects in which the quantum states of the constituting objects are
linked together so that one object can no longer be adequately described
without full mention of its counterpart—even if the individual objects
are spatially separated in a spacelike manner.
The property of
entanglement was understood in the early days of quantum theory,
although not by that name. Quantum entanglement is at the heart of the
EPR paradox developed by Albert Einstein, Boris Podolsky, and Nathan
Rosen in 1935. This interconnection leads to non-classical correlations
between observable physical properties of remote systems, often referred
to as nonlocal correlations.
Quantum mechanics holds that
observables, for example spin, are indeterminate until some physical
intervention is made to measure an observable of the object in question.
In the singlet state of two spin, it is equally likely that any given
particle will be observed to be spin-up or spin-down.
Measuring
any number of particles will result in an unpredictable series of
measurements that will tend to a 50% probability of the spin being up or
down. However, the results are quite different if this experiment is
done with entangled particles. For example, when two members of an
entangled pair are measured, their spin measurement results will be
correlated.
Two (out of infinitely many) possibilities are that
the spins will be found to always have opposite spins (in the
spin-anti-correlated case), or that they will always have the same spin
(in the spin-correlated case). Measuring one member of the pair
therefore tells you what spin the other member would have if it were
also measured. The distance between the two particles is irrelevant.
• http://en.wikipedia.org/wiki/Quantum_...
---
The Cassiopeia Project - making science simple!
The
Cassiopeia Project is an effort to make high quality science videos
available to everyone. If you can visualize it, then understanding is
not far behind.
• http://www.cassiopeiaproject.com
.
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