A coherent echo protocol combining one-axis twisting and QND measurement enhances collective spin squeezing and encodes the entanglement in two magnetic sublevels for metrology use.
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Derives a generalized Schawlow-Townes linewidth limit for feedback oscillators that can be saturated by bad-cavity devices or surpassed via quantum engineering such as atomic spin squeezing.
citing papers explorer
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Enhancing collective spin squeezing via one-axis twisting echo control of individual atoms
A coherent echo protocol combining one-axis twisting and QND measurement enhances collective spin squeezing and encodes the entanglement in two magnetic sublevels for metrology use.
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A Generalized Schawlow-Townes Limit
Derives a generalized Schawlow-Townes linewidth limit for feedback oscillators that can be saturated by bad-cavity devices or surpassed via quantum engineering such as atomic spin squeezing.