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Qiskit documentation for QuantumCircuit.u(theta, phi, lam, qubit) does not mentions the axis against given angle argument for rotation operation. It just says rotation angle of the gate.

So which angle corresponds to rotation operation along which axis?

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    $\begingroup$ You can check those 2 questions, they discuss in details theta, phi and lambda 1 and 2 $\endgroup$
    – kibrahim
    Aug 3 at 8:47

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You can find the documentation page for UGate which shows the matrix representation of the gate with different angles. https://qiskit.org/documentation/stubs/qiskit.circuit.library.UGate.html

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