Squeezed spin states possess unique quantum correlation or entanglement thatare of significant promises for advancing quantum information processing andquantum metrology. In recent back to back publications [C. Gross \textit{et al,Nature} \textbf{464}, 1165 (2010) and Max F. Riedel \textit{et al, Nature}\textbf{464}, 1170 (2010)], reduced spin fluctuations are observed leading tospin squeezing at -8.2dB and -2.5dB respectively in two-component atomiccondensates exhibiting one-axis-twisting interactions (OAT). The noisereduction limit for the OAT interaction scales as $\propto 1/{N^{2/3}}$, whichfor a condensate with $N\sim 10^3$ atoms, is about 100 times below standardquantum limit. We present a scheme using repeated Rabi pulses capable oftransforming the OAT spin squeezing into the two-axis-twisting type, leading toHeisenberg limited noise reduction $\propto 1/N$, or an extra 10-foldimprovement for $N\sim 10^3$.
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机译：压缩的自旋态具有独特的量子相关性或纠缠度，对于推进量子信息处理和量子计量学具有重要的前景。在最近的背对背出版物中[C. Gross \ textit {et al，Nature} \ textbf {464}，1165（2010）和Max F. Riedel \ textit {et al，Nature} \ textbf {464}，1170（2010）]，观察到自旋波动减小，导致在具有一轴扭曲相互作用（OAT）的两组分原子冷凝物中，旋旋分别以-8.2dB和-2.5dB压缩。 OAT交互作用的降噪极限为$ \ proto 1 / {N ^ {2/3}} $，对于具有$ N \ sim 10 ^ 3 $原子的冷凝物，约为标准量子极限以下100倍。我们提出了一种使用重复Rabi脉冲的方案，该方案能够将OAT自旋压缩转换为两轴扭曲类型，从而导致Heisenberg有限的降噪$ \ proto 1 / N $，或对$ N \ sim 10 ^ 3进行额外的10倍改进$。
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