Sum and difference squeezing of the electromagnetic field.
Sum and difference squeezing of the electromagnetic field.
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DOI：
10.1103/physreva.40.3147
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发表时间：
1989-09
期刊：
影响因子：
--
通讯作者：
Hillery
中科院分区：
文献类型：
--
作者：
Hillery
和压缩和差压缩都是高阶双模压缩效应。通过和频产生将和压缩转化为正常压缩。用来定义它的运算符形成了su(1，1)李代数的表示。差分压缩可以通过差频产生产生正常压缩。刻画它的运算符形成了su(2)李代数的表示。两者都是非经典效应。对于不相关模，至少在其中一个模中存在压缩是存在和压缩或差压缩的必要条件。如果这些模式是相关的，这就不再是真的了。通过将压缩模与相干态的模相结合，可以产生和压缩和差压缩。和压缩也是由参数放大器产生的。为了更好地说明这些效应中的一部分，给出了和压缩的图示。
Sum and difference squeezing are both higher-order, two-mode squeezing effects. Sum squeezing is turned into normal squeezing by sum-frequency generation. The operators that are used to define it form a representation of the su (1, 1) Lie algebra. Difference squeezing can generate normal squeezing through difference-frequency generation. The operators that characterize it form a representation of the su (2) Lie algebra. Both are nonclassical effects. For uncorrelated modes the presence of squeezing in at least one of the modes is a necessary condition for the existence of either sum or difference squeezing. If the modes are correlated this is no longer true. Both sum and difference squeezing can be generated by combining a squeezed mode with one in a coherent state. Sum squeezing is also produced by a parametric amplifier. In order to better illustrate some of these effects a pictorial representation of sum squeezing is presented.