November 19, 2012
Published by Bryan at November 19, 2012
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The invisible side of quantum spin

In both cases to detect a spin a probe must be used. The picture that emerges of spin is the well-known point particle having a single axis of quantization, defined by the orientation of the probe field. What happens when the probe is removed?
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October 26, 2012
Published by Bryan at October 26, 2012
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Spin and Quantum Computers

One day I am sure that physics will view Nature as real. Throughout history initial ideas of non-local effects, also called “action-at-a-distance”, have been repudiated and replaced with something more physically reasonable. The most well-known examples are the early attempts to understand gravity and electromagnetism. So it will be with non-locality between entangled particles.
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October 15, 2012
Published by Bryan at October 15, 2012
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Quantum Coherence – now Nature hides stuff from us.

The Heisenberg Uncertainty Principle does more than restrict what we can measure, it also result in us missing properties that are actually present.
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October 11, 2012
Published by Bryan at October 11, 2012
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The Bloch Sphere and Spin in Quantum Mechanics

This complementary nature of states with non-commuting operators, (σX, σY ,σZ), is the basis for the Copenhagen Interpretation of Quantum Mechanics (CI). It states, basically, that if the Z states exist then the X do not, and vice versa. I would rather conclude that it is impossible to determine experimentally if spin has more than one axis of quantization.
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July 3, 2012
Published by Bryan at July 3, 2012
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Complementarity between spin components in quantum mechanics

This example nicely shows several things about quantum mechanics. First quantum mechanics is a statistical theory of measurement. You only get the SG results after many spins have been filtered. Second, Heisenberg’s uncertainty relations tell us that you cannot devise an experiment that will measure both the Z and X polarization simultaneously. You can do it for one, but not the other, and vice versa.
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