A detection method for weak signal with coherence average is presented, and the principle of cross-correlation detection is introduced.
提出了采用相干平均法提高信号的信噪比并检测微弱信号的方法，介绍了相关检测的原理。
It is proved that the average photon Numbers and the second-order quantum coherence are dramatically influenced by the entangled degree of the atoms.
分析原子的纠缠度对约化后光场性质的影响，结果表明纠缠度强烈影响光场的平均光子数分布和二阶量子相干性。
Results It was coherence between average income-consumption per person and wealth index constructed by the main component analysis.
结果主成分分析法构造的财富指数与家庭收入和支出调查一致性较好。
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