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Possibly in the slightly negative energy region of a Casimir mirror pair However, the effect is really small


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There may be scope in this question to mention the faster than light (FTL) capabilities of Tachyons (should they exist). If (in the language of Speacial Relativity) we apply the first postulate of SR to tachyons and there is an instantaneous transmission of information in one inertial frame then it would be true to say this occurs in all inertial frames. I ...


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As said in the commentaries, the first one comes from the Dirac formalism. Simply put, it deals with quantum states as vectors $\lvert a \rangle$ whose components contain the projections of the system into different eigenstates. For a system, the set of state eigenvectors $\lvert a_i \rangle$ must be linearly independent $\langle a_i \lvert a_j ...


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As you've seen, the word quadrature is overladen with many, none-too-precise meanings. Here the "quadratures" loosely refer to the position and momentum observables: $$\hat{x} = \frac{1}{\sqrt{2}}(a + a^\dagger)$$ $$\hat{p} = \frac{i}{\sqrt{2}}\,(a - a^\dagger)$$ where $a,\,a^\dagger$ are the lowering/ raising operators and I've normalized the two ...



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