Based on the recent twisting-tensor approach [T. Opatrny, ArXiv:1408.3265(2014)], a specific scenario for fast and deep spin squeezing is proposed.Initially the state is subjected to one-axis twisting under optimumorientation, enabling the maximum squeezing rate allowed by the systemnonlinearity. Later on, when for highly squeezed states the one-axis twistingdeforms the uncertainty ellipse and deteriorates the squeezing properties, theprocess is switched to an effective two-axis counter-twisting by a sequence of$\pi/2$ pulses. The squeezing rate then slows to 2/3 of the maximum value, butthe process can continue for longer to achieve a very high degree of squeezing.
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机译：基于最近的扭曲张量方法[T. Opatrny，ArXiv：1408.3265（2014）]，提出了一种用于快速和深度自旋压缩的特定方案。首先，在最佳定向下对状态进行单轴扭曲，从而实现系统非线性所允许的最大压缩率。后来，当对于高度挤压的状态，单轴扭曲变形不确定性椭圆并恶化挤压特性时，该过程将通过一系列\ pi / 2 $脉冲切换为有效的两轴反向扭曲。然后，挤压速度减慢到最大值的2/3，但是该过程可以持续更长的时间，以实现非常高的挤压度。
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