同向Kerr非线性耦合器的高阶压缩
Higher-order squeezing for the codirectional Kerr nonlinear coupler
摘要：
本文研究了同向Kerr非线性耦合器的高阶压缩，即$n$阶单模压缩、和压缩和差压缩的演化。我们发现，压缩量减少时，$n$，即压缩阶，增加。对于特定的相互作用参数值，压缩因子呈现出一系列的回复-坍缩现象，并且随着$n$值的增大，这种现象变得更加明显。对于相同的相互作用参数值，和压缩可以提供比由$n$次高阶（$n\geq 2$）压缩产生的压缩更大的压缩量，并且可以映射到振幅平方压缩。此外，我们证明了差压缩是不相关的措施，从该设备获得有关压缩的信息。
英文摘要：
In this Letter we study the evolution of the higher-order squeezing, namely, $n$th-order single-mode squeezing, sum- and difference-squeezing for the codirectional Kerr nonlinear coupler. We show that the amount of squeezing decreases when $n$, i.e. the squeezing order, increases. For specific values of the interaction parameters squeezing factors exhibit a series of revival-collapse phenomena, which become more pronounced when the value of $n$ increases. Sum-squeezing can provide amounts of squeezing greater than those produced by the $n$th higher-order ($n\geq 2$) squeezing for the same values of interaction parameters and can map onto amplitude-squared squeezing. Further, we prove that the difference-squeezing is not relevant measure for obtaining information about squeezing from this device.
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