Answer by DaftWullie for How to change the sign of a phase: sending...
This very much depends on whether you know the phase $\alpha$ (which I assume is not intended to be the same as the amplitude $\alpha$!).If you do not know the phase $\alpha$, then the operation that...
View ArticleHow to change the sign of a phase: sending...
Say I have a qubit in the state (ignoring normalization) $$|\phi\rangle = \alpha|0\rangle + e^{i\alpha}\beta|1\rangle.$$How can I invert the sign of its phase, thus making it $$\alpha|0\rangle +...
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