I am looking for guidance in more generally how to developed n-bit gates in Cirq.
I am working on a QNN paper and I need to develop a n-controlled gate to be able to measure the cost function of the circuit.
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This is actually very easy in Cirq. The
controlled_by method can be used to automatically make any given gate controlled by an arbitrary number of control qubits. Here is a simple example for creating an X gate with 5 controls:
import cirq qb = [cirq.LineQubit(i) for i in range(6)] cnX = cirq.X.controlled_by(qb, qb, qb, qb, qb); circuit = cirq.Circuit(); circuit.append(cnX(qb));