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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Optimal finite-dimensional probe states for quantum phase estimation under particle loss are found via constrained optimization, and a two-step measurement strategy achieves the ultimate precision limit as confirmed by numerical simulations.
New general models for substrate and coating mechanical, thermoelastic, and thermorefractive noise in Michelson interferometers at high frequencies, validated against prior low-frequency models and Holometer data, then applied to GQuEST.
For suitable spatial and temporal correlations in non-Markovian dephasing, entangled probes achieve superior sensitivity scaling with probe number compared to separable states in Ramsey spectroscopy.
A hybrid magnonic optomechanical cavity with an internal OPA achieves full suppression of radiation-pressure back-action via coherent quantum noise cancellation and operates beyond the standard quantum limit at reduced pump power.
A quartic extension of the twisting-and-turning Hamiltonian generates new unstable fixed points that accelerate short-time amplification of quantum fluctuations, yielding enhanced sensitivity within accessible coherence times.
Photon counting readout detects weak postmerger gravitational wave signals at a rate of about 1 in 100 for SNR 0.2 and yields a twofold improvement in neutron star radius measurement after 20,000 events.
citing papers explorer
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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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Optimal noisy quantum phase estimation with finite-dimensional states
Optimal finite-dimensional probe states for quantum phase estimation under particle loss are found via constrained optimization, and a two-step measurement strategy achieves the ultimate precision limit as confirmed by numerical simulations.
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High-Frequency Thermal Noise in Michelson Interferometers
New general models for substrate and coating mechanical, thermoelastic, and thermorefractive noise in Michelson interferometers at high frequencies, validated against prior low-frequency models and Holometer data, then applied to GQuEST.
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Entanglement Enhanced Sensing with Qubits affected by non-Markovian Dephasing
For suitable spatial and temporal correlations in non-Markovian dephasing, entangled probes achieve superior sensitivity scaling with probe number compared to separable states in Ramsey spectroscopy.
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Quantum Noise Suppression Beyond the Standard Quantum Limit in a Hybrid Magnonic Optomechanical System
A hybrid magnonic optomechanical cavity with an internal OPA achieves full suppression of radiation-pressure back-action via coherent quantum noise cancellation and operates beyond the standard quantum limit at reduced pump power.
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Instability-Enhanced Quantum Sensing with Tunable Multibody Interactions
A quartic extension of the twisting-and-turning Hamiltonian generates new unstable fixed points that accelerate short-time amplification of quantum fluctuations, yielding enhanced sensitivity within accessible coherence times.
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Photon counting readout for detection and inference of gravitational waves from neutron star merger remnants
Photon counting readout detects weak postmerger gravitational wave signals at a rate of about 1 in 100 for SNR 0.2 and yields a twofold improvement in neutron star radius measurement after 20,000 events.