The sketch below represents the effect of different single-qubit noise channels on the Bloch sphere. The white circle lies on the y-z plane, green lies on x-y and purple on x-z. The white point represents |0⟩, the black point |1⟩, and the green point |+⟩. The sliders, in order, control the strength of various noise channels:
- phase flip channel;
- bit flip channel;
- bit/phase flip channel;
- depolarization.
You can also drag the sphere around with the mouse. Various bugs to be fixed in future editions!