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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Optimizing the squeezing phase in a correlated squeezed-thermal reservoir maximizes quantum Fisher information for phase and correlation parameters and reduces joint-estimation variance.
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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From Independent to Joint: Enhancing Quantum Phase and Correlation Factor Estimation by Squeezed Reservoir Engineering
Optimizing the squeezing phase in a correlated squeezed-thermal reservoir maximizes quantum Fisher information for phase and correlation parameters and reduces joint-estimation variance.
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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.