铯原子四波混频双光束源的实现
Realization of a twin beam source based on four-wave mixing in Cesium
摘要：
四波混频（4 WM）是一种强流非经典孪生光束源。当强激光束（泵浦）和弱激光束（种子）在$χ^{(3)}$介质（这里是铯蒸气）中重叠时，它可以产生，频率接近原子跃迁的共振。由4 WM产生的孪生光束具有自然接近原子跃迁的频率，并且即使在CW泵浦状态下也可以是强烈的（增益$\gg 1$），这对于非线性晶体中的PDC $χ^{(2)}$现象不是这种情况。因此，4 WM非常适合于原子-光相互作用和基于原子的量子协议。在这里，我们提出了第一个实现的四波混频源利用$D_2$线铯原子。
英文摘要：
Four-wave mixing (4WM) is a known source of intense non-classical twin beams. It can be generated when an intense laser beam (the pump) and a weak laser beam (the seed) overlap in a $χ^{(3)}$ medium (here cesium vapor), with frequencies close to resonance with atomic transitions. The twin beams generated by 4WM have frequencies naturally close to atomic transitions, and can be intense (gain $\gg 1$) even in the CW pump regime, which is not the case for PDC $χ^{(2)}$ phenomenon in non-linear crystals. So, 4WM is well suited for atom-light interaction and atom-based quantum protocols. Here we present the first realization of a source of 4-wave mixing exploiting $D_2$ line of Cesium atoms.
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