Make RZZ a subclass of ParityPhase.

pyzx/circuit/gates.py

@@ -725,24 +725,6 @@ def to_graph(self, g, q_mapper, c_mapper):
         for gate in self.to_basic_gates():
             gate.to_graph(g, q_mapper, c_mapper)
 
-class RZZ(Gate):
-    name = 'RZZ'
-    qasm_name = 'rzz'
-    print_phase = True
-    def __init__(self, control: int, target: int, phase: FractionLike) -> None:
-        self.target = target
-        self.control = control
-        self.phase = phase
-
-    def to_basic_gates(self):
-        return [CNOT(control=self.control,target=self.target),
-                ZPhase(self.target,phase=self.phase),
-                CNOT(control=self.control,target=self.target)]
-
-    def to_graph(self, g, q_mapper, c_mapper):
-        for gate in self.to_basic_gates():
-            gate.to_graph(g, q_mapper, c_mapper)
-
 class CPhase(CRZ):
     name = 'CPhase'
     qasm_name = 'cp'
@@ -820,6 +802,16 @@ def tcount(self):
         return 1 if self.phase.denominator > 2 else 0
 
 
+class RZZ(ParityPhase):
+    name = 'RZZ'
+    qasm_name = 'rzz'
+    def __init__(self, control: int, target: int, phase: FractionLike) -> None:
+        self.control = control
+        self.target = target
+        self.targets = (control, target)
+        self.phase = phase
+
+
 class FSim(Gate):
     name = 'FSim'
     qsim_name = 'fs'