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Physics
Quantum Physics
Quantum Superposition While Observing Phenomena?
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[QUOTE="Simon Bridge, post: 5499533, member: 367532"] ... these last options describe 4 states that are only available if the overall state is not an entangled state, so you have written a contradiction. The entangled state you are thinking of is a superposition of the third and fourth ones. Think of the word "entangled" is a technical term that describes a class of total state ... sometimes used loosely to say that the individual states are not independent. It does not matter which order the cat states are measured or if the measurement is simultaneous... (note: it is always possible to find a reference frame where the measurements are simultaneous... the probabilities must still hold.) Nice clear lecture on the basics of entangled states [URL]http://www.lecture-notes.co.uk/susskind/quantum-entanglements/lecture-5/example-states/[/URL] - the notation |x,y> is just a state so |u,d> is a 2-particle state where the 1st one is spin-up and the second one is spin-down. The 4 independent cat states would be |aa>, |ad>, |da>, |dd>... much of the maths can be skimmed: just assume he did it right. The main point of the schrodinger cat experiment is to link the fates of the cats to a quantum system ... where the cat's fate is tied to a measurement of the system. Try this for an entangled particle system. [/QUOTE]
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Quantum Superposition While Observing Phenomena?
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