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This is a Bloch sphere visualiser - a quantum mechanical simulation of a two state particle under the influence of an external light field. Set an initial position for the Bloch vector, queue up some pulses and press start. The input boxes support simple math expressions (pi, cos, etc.). The time for a light pulse isn't in units of time: rather, it is in angular units (e.g. a pi/2 pulse will rotate the vector by pi/2 around some axis dependent on the detuning). Likewise for free precession. Also, you can rotate the viewpoint by dragging the mouse. Note this is not 'to scale' in terms of time/speed: it is more to show how the Bloch vector moves. A constant light intensity is used.