以此为基础，可以利用单光子作为外触发实现对与其纠缠的其它光子的序列控制，为量子通讯网络建立可靠的量子光源。

Based on it, we can use one of the down converted photons as a trigger to control the other photons in sequence for the application of quantum network.

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UML序列图描述了交互对象间的协作，如在实时和分布式系统中通讯实体间的信息交互。

UML sequence diagrams describe a collaboration of interacting objects, where the interactions are exchanges among communicating entities in real time and distributed systems.

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