cirq.ZZ

cirq.ZZ = cirq.ZZ

The Z-parity gate, possibly raised to a power.

The ZZ**t gate implements the following unitary:

(Z⊗Z)^t = [1 . . .]
          [. w . .]
          [. . w .]
          [. . . 1]

where w = e^{i \pi t} and '.' means '0'.