We demonstrate the deterministic entanglement of two individually addressed neutral atoms using a Rydberg blockade mediated controlled-not gate. Parity oscillation measurements reveal a Bell state fidelity of F=0.58±0.04, which is above the entanglement threshold of $F=0.5$, without any correction for atom loss, and F=0.71±0.05 after correcting for background collisional losses. The fidelity results are shown to be in good agreement with a detailed error model.
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Zhang et al. (2010) studied this question.