Unitary for Physicists

If you are already familiar with quantum computing terms, have used cirq, or come from a physics background, the terms in the Unitary may feel a bit unfamiliar. They are meant to connect quantum concepts to traditional programming contructs, such as "if/then".

The following is a table that connects physics terms to cirq and unitary terms.

Physics Cirq Unitary
Qubit cirq.Qid alpha.QuantumObject
Qutrit cirq.Qid alpha.QuantumObject (using an enum with three values)
Quantum circuit cirq.Circuit alpha.QuantumWorld
Generic Unitary cirq.Gate alpha.QuantumEffect
Gate applied to specified qubits cirq.Operation alpha.QuantumEffect(qubits)
X gate cirq.X alpha.Flip()
\(\sqrt{X}\) or square root of NOT cirq.X ** 0.5 alpha.Flip(effect_fraction=0.5)
Z gate cirq.Z alpha.Phase()
Hadamard cirq.H alpha.Superposition()
Controlled-gate gate.controlled_by() alpha.quantum_if()
CNOT cirq.CNOT(a,b) alpha.quantum_if(a).then_apply(alpha.Flip())(b)
CZ cirq.CZ(a,b) alpha.quantum_if(a).then_apply(alpha.Phase())(b)