Bidirectional internal squeezing using opposing optical parametric amplifiers saturates quantum noise lower bounds from internal dissipation and renders high-frequency signal-referred noise independent of arm and signal-extraction transmissivities.
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Ultimate precision bounds for multiparameter Markovian noise metrology show average variance scaling as Ω(1/(T R²)) with Heisenberg scaling in dissipative channels R when using entangled probes and high-rank signal correlations, attainable via rapid prepare-and-measure protocols.
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Bidirectional Internal Squeezing for Gravitational-Wave Detectors
Bidirectional internal squeezing using opposing optical parametric amplifiers saturates quantum noise lower bounds from internal dissipation and renders high-frequency signal-referred noise independent of arm and signal-extraction transmissivities.
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Precision Limits of Multiparameter Markovian-Noise Metrology
Ultimate precision bounds for multiparameter Markovian noise metrology show average variance scaling as Ω(1/(T R²)) with Heisenberg scaling in dissipative channels R when using entangled probes and high-rank signal correlations, attainable via rapid prepare-and-measure protocols.