= Rabi cycle
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{title2=$P_{g\to e}(t)=\sin^2(\Omega t/2)$ on resonance}
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= Rabi oscillation
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A <Rabi oscillation> is a coherent oscillation of populations in a driven two-level <quantum system>.
A resonant drive can transfer a <quantum state> from one <energy eigenstate> to another and then bring its population back. This is <unitary time evolution>: the drive exchanges <energy> with the selected <two-level system>, while total <probability> stays one. One complete <Rabi cycle> has population period $2\pi/\Omega$; halfway through, a <Rabi pi pulse> transfers the whole population in the ideal model. This makes <Rabi oscillations> useful for calibrating <resonant quantum control>, preparing <quantum superpositions> and supplying the pulses of <Ramsey interferometry>.
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