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CZ Gate

The CZ gate (or CPhase gate) is two-qubit operation defined as:

 CZ=(100001000010000−1)\ CZ = \begin{pmatrix} 1 & 0 & 0 & 0 \ 0 & 1 & 0 & 0 \ 0 & 0 & 1 & 0 \ 0 & 0 & 0 & -1 \end{pmatrix}