the use of the function about cu gate seems that there is something confusing. #13432
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Something is not clear or an error documentation
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Looks like this belongs in the API repo: https://github.com/Qiskit/qiskit |
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That's a design choice we made: U is a general 1-qubit gate and CU is a general 2-qubit gate, which needs the additional angle. I agree this can be confusing coming from the circuit method usage. We could consider adding a dispatch that allows to handle the case where only 3 parameters are given to the cu method, though this might open the door to accidentally using the wrong signature... |
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URL to the relevant documentation
https://docs.quantum.ibm.com/api/qiskit/qiskit.circuit.library.CU1Gate
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Describe the fix.
from qiskit import QuantumCircuit
from math import pi
#create the circuit
circuit = QuantumCircuit(4, 4)
circuit.cu(-pi/2, -pi/2, pi/2,0, 1, 3)
circuit.cu(-pi/2, 0 , 0, 3,2, 1)
circuit.draw(output='mpl', plot_barriers=False, fold=-1)
It is strange to show the four phase in a cu gate while useful parameter is only the three phase and the control qubit and target qubit
#easier form to understand which keeps receiving Error - cu() missing 1 required positional argument: 'target_qubit'
circuit.cu(-pi/2, -pi/2, pi/2, 1, 3)
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