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I am interested in using the QASM2Cirq methods to make this gate: u2(0, np.pi, q[0]).

How can I build that object using Cirq rather than QASM string value passed onto cirq.

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From the spec, $U_2(\phi, \lambda) = U ( \frac{\pi}{2}, \phi, \lambda)$. We can use Cirq's QasmUGate.

import cirq
from cirq.circuits.qasm_output import QasmUGate

q0 = cirq.NamedQubit('q[0]')
u2_gate = QasmUGate(0.5, 0, 1) # The angles are normalized to the range [0, 2) half_turns
circuit = cirq.Circuit(u2_gate(q0))
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