twin beam meaning in English

并置梁
双光束

So they can be used for spectroscopy , coherent communication and quantum optical studies . they also can produce various kinds of nonclassical states of light generation of squeezed vacuum below threshold , of strongly intensity - correlated twin beam above threshold and quadrature squeezing of the pump wave above threshold
同时，连续光学参量振荡器也是一种产生非经典光场的理想装置：低于阈值运转可以产生正交位相压缩真空态，高于阈值运转可以产生强度关联的孪生光子对以及反射泵浦光的正交分量压缩。