A delta-kick focusing step applied to a BEC before one-axis twisting enhances spin squeezing and yields a fourfold improvement in phase sensitivity for quantum gravimetry, surpassing the SQL by a factor of ~20.
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The authors identify distinct regimes for QND measurement squeezing (short times) and deterministic squeezing (longer times) via the ratio of tensor to vector light shifts, predicting a spin variance of 0.03 in 50 ms for Yb-173.
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Enhanced squeezing for quantum gravimetry in a Bose-Einstein condensate with focussing
A delta-kick focusing step applied to a BEC before one-axis twisting enhances spin squeezing and yields a fourfold improvement in phase sensitivity for quantum gravimetry, surpassing the SQL by a factor of ~20.
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Deterministic nuclear spin squeezing and squeezing by continuous measurement using vector and tensor light shifts
The authors identify distinct regimes for QND measurement squeezing (short times) and deterministic squeezing (longer times) via the ratio of tensor to vector light shifts, predicting a spin variance of 0.03 in 50 ms for Yb-173.