It is for this reason that you need a device, such as Dr Shields's, which can detect and count individual photons as they come out of different parts of the beam-splitter.
基于这个道理，你需要一个诸如谢尔兹博士所设计的设备，当光子从分束器不同地方出来的时候，可以检测并计数单个光子。
The returning light beams merge together at the beam splitter and create an interference pattern of light and dark regions where the light waves either cancel out or reinforce each other.
返回的两束光在分束器处汇合，产生由亮区和暗区组成的干涉图案，图案中，光波要么相互抵消要么相互增强。
If they are the same, the two photons will come out of the beam-splitter together.
如果他们状态一样，这两个光子就在分束器一起出来。
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