The RX gate implements . On the Bloch sphere, this gate corresponds to rotating the qubit state around the x axis by the given angle.
Composer reference
OpenQASM reference
Q-sphere
Note about q-sphere representations
rx(angle) q[0];
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 . Therefore, this is the angle used in the q-sphere visualization.
angle
