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# Questions tagged [phase-kickback]

For questions about phase kick-back. For a detailed description of the mechanism, go through https://quantumcomputing.stackexchange.com/questions/2565 and the answers therein.

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### Obtaining phases of all basis states

I’m wondering that is there a way to separate phases of basis states from the magnitudes (namely putting phases on some new basis states with the same probability magnitude) if the exact values of ...
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### Is the $|-\rangle$ state the only one that can do the trick for Grover's algorithm?

$\newcommand{\qr}{|#1\rangle}$Grover algorithm's input is a superposition, representing the haystack, and the Bell state $\qr{-}$. The $\qr{-}$ seems utterly important: when I replaced $\qr{-}$ by,...
112 views

### Equivalent unitary transformations

Suppose $x \in \{0,1\}^n$. The standard way to make a query is with an oracle $O_x$ that given an input $|i,b \rangle$ returns $|i,b \oplus x_i \rangle$. Via the phase kick-back trick, this can be ...