Say we have a custom gate CG, defined by a unitary matrix U, and line qubits qubits in Cirq. Something like this:

import numpy
import cirq

U = np.eye(8)    # The custom unitary matrix goes here
CG = cirq.MatrixGate(U)
qubits = cirq.LineQubit.range(3)

We build the circuit as follows:

circuit = cirq.Circuit()
circuit.append(CG(qubits[0], qubits[1], qubits[2]))

Is it possible to build the circuit without explicitly specifying all the qubits? Something like circuit.append(CG(qubits)), which would apply the CG gate to all the qubits?


1 Answer 1


In Python you can say callable(*args) instead of callable(args[0], args[1], args[2]).

  • $\begingroup$ i.e. in your example you could write CG(*qubits) $\endgroup$
    – dabacon
    Jul 30, 2020 at 21:35

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