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What is U gate in Quantam cloud Computing?

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U gate

(Previously called the U3 gate) The three parameters allow the construction of any single-qubit gate. Has a duration of one unit of gate time.

Composer reference

OpenQASM reference

Q-sphere

Note about q-sphere representations

u_gate

u(theta, phi, lam) q[0];

u3_qsph

The q-sphere representation shows the state after the gate operates on the initial equal superposition state  where  is the number of qubits needed to support the gate.

In IBM Quantum Composer, the default value for angle is .

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