Figure 4: Ramsey fringes. | Nature Physics

Figure 4: Ramsey fringes.

From: Coherent control of a classical nanomechanical two-level system

Figure 4

a, Pulse scheme. The system is adiabatically tuned from the initialization to the lower state. A π/2-pulse creates a superposition state, and after a delay τ a second π/2-pulse is applied.b, A 500 Hz detuning between the drive and precession frequency leads to a slow rotation of the superposition state in the equator plane of the Bloch sphere, giving rise to a beating pattern in the measured z component after the second pulse (data shown in dark blue; fit in red). The Bloch sphere in the inset shows the state of the Bloch vector at selected times, which are marked in the same colour in a.

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