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arXiv · 1105.0466

Spin squeezing: transforming one-axis-twisting into two-axis-twisting

Y. C. Liu·Z. F. Xu·G. R. Jin·L. You
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Abstract

Squeezed spin states possess unique quantum correlation or entanglement that are of significant promises for advancing quantum information processing and quantum 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 to spin squeezing at -8.2dB and -2.5dB respectively in two-component atomic condensates exhibiting one-axis-twisting interactions (OAT). The noise reduction limit for the OAT interaction scales as $\propto 1/{N^{2/3}}$, which for a condensate with $N\sim 10^3$ atoms, is about 100 times below standard quantum limit. We present a scheme using repeated Rabi pulses capable of transforming the OAT spin squeezing into the two-axis-twisting type, leading to Heisenberg limited noise reduction $\propto 1/N$, or an extra 10-fold improvement for $N\sim 10^3$.

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Y. C. Liu, Z. F. Xu, G. R. Jin, L. You. 2011-05-03. Spin squeezing: transforming one-axis-twisting into two-axis-twisting. https://doi.org/10.1103/physrevlett.107.013601

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