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We report the experimental observations on the simultaneous EIT effects forprobe and trigger fields (double EIT) as well as the large cross-phasemodulation (XPM) between the two fields in a four-level tripod EIT system ofthe D1 line of 87Rb atoms. The XPM coefficients (larger than 2*10-5cm2/W) andthe accompanying transmissions (higher than 60%) are measured at slightlydetuning of the probe field from the exact EIT resonance condition. Thepresented system can be applied in the recently proposed quantum informationprocessing with weak cross-Kerr nonlinearities.

Large Cross-phase Modulation Based on Double EIT in a Four-level Tripod Atomic System