I know that a superposition is a state in which there are 50% and 50% (other % also) chances of two things to happen so why am I not in a superposition state?
Example, I am at rest and i now choose to be in motion so there can be a 50-50% chance of myself that i will be walking or running, so I think I am in a superposition state so can't we say that everything in this universe is in a superposition state?
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3Decoherence – John Rennie May 04 '15 at 17:51
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possible duplicate of Validity of naively computing the de Broglie wavelength of a macroscopic object – John Rennie May 04 '15 at 17:54
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1Hi Bhavesh, I've linked a possible duplicate, but there are many closely related questions on the site. See the search I've linked in my first comment. – John Rennie May 04 '15 at 17:55
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1Of course you're in a superpositioned state when you're at rest (or when you're running, or any other time). The state of rest is the sum of the states $A=(1/2)rest+(1/2)running$ and $B=(1/2)rest-(1/2)running$. – WillO May 04 '15 at 18:40
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Even if a suitable operator with that spectrum existed (it doesn't have to), at room temperature your coherence length would be much smaller than the size of a nucleus. – CuriousOne May 04 '15 at 19:43
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One possible interpretation of quantum mechanics is that everything actually is (and stays) in a state of superposition, you just don't notice because no measurement can tell the difference between being in a superposition sate and a "non-superposition state". This is (equivalent to) the many worlds interpretation. – Emil May 04 '15 at 20:32
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I just want to mention that only two different eigenstates of a measurement can be in superposition. – Eden Harder May 05 '15 at 06:11