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Match symbolic phase gadgets #132

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Aug 22, 2023
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Match symbolic phase gadgets #132

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7 changes: 6 additions & 1 deletion pyzx/rules.py
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Original file line number Diff line number Diff line change
Expand Up @@ -778,7 +778,12 @@ def match_phase_gadgets(g: BaseGraph[VT,ET]) -> List[MatchGadgetType[VT]]:
outputs = g.outputs()
# First we find all the phase-gadgets, and the list of vertices they act on
for v in g.vertices():
if phases[v] != 0 and hasattr(phases[v], 'denominator') and phases[v].denominator > 2 and len(list(g.neighbors(v)))==1:
non_clifford = phases[v] != 0 and getattr(phases[v], 'denominator', 1) > 2
try: # symbol check
float(phases[v])
except:
non_clifford = True
if non_clifford and len(list(g.neighbors(v)))==1:
n = list(g.neighbors(v))[0]
if phases[n] not in (0,1): continue # Not a real phase gadget (happens for scalar diagrams)
if n in gadgets: continue # Not a real phase gadget (happens for scalar diagrams)
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