Override gate.controlled() for GlobalPhaseGate to return a ZPowGate #6073
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dstrain115
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May 9, 2023
harry-phasecraft
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Oct 31, 2024
…uantumlib#6073) * Override gate.controlled() for GlobalPhaseGate to return a ZPowGate * Test unitary equivalence * Override controlled only if gate is not parameterized * Fix typo * Fix type check * another attempt at fixing types * Add a comment and additional tests
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ZPowGate,CZPowGateandCCZPowGatecurrently have specializedGate.controlled()overrides such thatcirq.Z.controlled()returns acirq.CZinstead of acirq.ControlledGate(sub_gate=cirq.Z). This is nice and useful for writing controlled versions of common gates.This PR extends the same idea to
GlobalPhaseGate, because a controlledGlobalPhaseGateis equivalent to applying acirq.ZPowGate.