Journal
PHYSICAL REVIEW LETTERS
Volume 127, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.160501
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Funding
- LabEx ENS-ICFP [ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*]
- project macQsimal of the EU Quantum Flagship
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The study identifies the large-N scaling of metrological quantum gain provided by over-squeezed spin states and predicts a discontinuous change in quantum gain at a critical preparation time. It provides analytical recipes for optimal implementation of quantum enhancements with non-Gaussian spin states in existing experiments.
We identify the large-N scaling of the metrological quantum gain offered by over-squeezed spin states that are accessible by one-axis twisting, as a function of the preparation time. We further determine how the scaling is modified by relevant decoherence processes and predict a discontinuous change of the quantum gain at a critical preparation time that depends on the noise. Our analytical results provide recipes for optimal and feasible implementations of quantum enhancements with non-Gaussian spin states in existing experiments, well beyond the reach of spin squeezing.
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