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.
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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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.
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