The Larmor precession panel allows the user to apply a magnetic field to the qubit and view the evolution of the qubit state.

The Larmor precession allows the user to see how the state of a qubit is affected by a constant magnetic field. The magnetic field in this simulator points from the origin, along the Z axis, to Z+. The user has the ability to alter the field and view in real time the effects of that field. The figure shows the tab that displayed on the simulator when the user selects the "Larmor Precession" tab. There are four controls that are available. The first is the magnetic force strength slider. This slider allows the user to slide the scale from 0.1 to 10 Teslas. As the strength of the magnetic field is increases, the angular velocity of the qubits will increase. The precession does not start until the user hits the "Start" button. At this point, the effect of the constant magnetic field will be seen on the qubits. The user may continue to use the slider to change the strength of the magnetic field. When the user is finished applying the magnetic field to the qubits, the "Stop" button should be clicked. The stop button will immediately end the effect of the Larmor precession, but will keep the qubits in their last state. Clicking on the "Restart" button will bring the qubits back to their original state when the precession was last started.