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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A squeezed-vacuum interferometer with nonlinear phase estimation achieves Heisenberg scaling in the lossless limit, sub-SQL sensitivity under noise, and the first experimental quantum-optimal Bayesian signal estimation in a balanced interferometer.
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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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Noise-Resilient Quantum Metrology
A squeezed-vacuum interferometer with nonlinear phase estimation achieves Heisenberg scaling in the lossless limit, sub-SQL sensitivity under noise, and the first experimental quantum-optimal Bayesian signal estimation in a balanced interferometer.