The quantum noise fraction β shows resonant mass gravitational wave detectors are thermally dominated below ~230 MHz, with quantum enhancement viable only above the thermal frontier ħω = k_B T ln 3, exemplified by a 1 GHz bulk acoustic resonator at 10 mK yielding β = 0.98.
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Phase-locked phonon laser in levitated nanoparticles reduces force noise to 4.0(3)×10^{-22} N/√Hz, achieves 12,500 s coherence, and delivers 8(4)×10^{-24} N resolution.
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Quantum Noise Fraction and the Thermal Frontier in High-Frequency Gravitational Wave Detection
The quantum noise fraction β shows resonant mass gravitational wave detectors are thermally dominated below ~230 MHz, with quantum enhancement viable only above the thermal frontier ħω = k_B T ln 3, exemplified by a 1 GHz bulk acoustic resonator at 10 mK yielding β = 0.98.
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Phase-locked phonon laser enhanced ultra-weak force measurement
Phase-locked phonon laser in levitated nanoparticles reduces force noise to 4.0(3)×10^{-22} N/√Hz, achieves 12,500 s coherence, and delivers 8(4)×10^{-24} N resolution.