Zusammenfassung
We use coherent excitation of 3-16 atom ensembles to demonstrate collective
Rabi flopping mediated by Rydberg blockade. Using calibrated atom number
measurements, we quantitatively confirm the expected \$N\$ Rabi frequency
enhancement to within 4\%. The resulting atom number distributions are
consistent with essentially perfect blockade. We then use collective Rabi \$\pi\$
pulses to produce \$N=1,2\$ atom number Fock states with fidelities of 62\%
and 48\% respectively. The \$N=2\$ Fock state shows the collective Rabi
frequency enhancement without corruption from atom number fluctuations.
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