How to draw CCZ gate in IBM Quantum Composer? There is no CCZ gate in quantum composer.
To my knowledge, there is no built-in
CCZ gate in Qiskit at all, and thus it doens't exist in the IBM Quantum Composer as well.
In order to run a
CCZ gate one needs to construct it. There are several options to do that, some more or less efficient than the others. Anyway a basic identity of single-qubit gates is $Z = HXH$ (You can try the matrix multiplication yourself and see it works). Since
CCX is a built-in gate in Qiskit and it's usable in IBM Quantum Composer you can construct easily the following circuit for
About the second question - the following decomposition for the gate in the picture you have posted can be implemented easily using IBM Quantum Composer:
It's equivalent to the gate in the picture that you have posted because q1 has been defined as an "anti-control" qubit - I.e the opposite of a control qubit, i.e perform the controlled operation if the qubit is in state $|0⟩$. So flipping this qubit just before and right after the control gate does the job.
I don't know why you limit yourself to IBM Quantum Composer only, but if we use Qiskit than we can construct the gate in the picture you have posted using the following code:
from qiskit import QuantumCircuit from qiskit.circuit.library.standard_gates.z import ZGate qc1 = QuantumCircuit(3) U1 = ZGate().control(num_ctrl_qubits = 2, ctrl_state = '01') qc1.append(U1,qargs = [0,1,2])