At the parametric oscillation threshold, an exceptional-point sensor with squeezing reaches a Cramér-Rao bound scaling as θ^{2n}, which is quartic (θ^4) for a second-order exceptional point.
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Squeezing enhanced sensing at an exceptional point
At the parametric oscillation threshold, an exceptional-point sensor with squeezing reaches a Cramér-Rao bound scaling as θ^{2n}, which is quartic (θ^4) for a second-order exceptional point.