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Superconducting Levitated Detector of Gravitational Waves
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abstract
A magnetically levitated mass couples to gravity and can act as an effective gravitational wave detector. We show that a superconducting sphere levitated in a quadrupolar magnetic field, when excited by a gravitational wave, will produce magnetic field fluctuations that can be read out using a flux tunable microwave resonator. With a readout operating at the standard quantum limit, such a system could achieve broadband strain noise sensitivity of $h \lesssim 10^{-20}/\sqrt{\rm Hz}$ for frequencies of $1~\mathrm{kHz}~-~1~\mathrm{MHz}$, opening new corridors for astrophysical probes of new physics.
Forward citations
Cited by 4 Pith papers
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Halbach Magnetic Weber Bars
Halbach-array field gradients boost the displacement-to-flux readout of a resonant-sphere magnetic Weber bar, projecting ~10^-21/√Hz strain sensitivity near 10 kHz and ~5×10^-20/√Hz broadband at higher frequencies.
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Cavity Multimodes as an Array for High-Frequency Gravitational Waves
A 9-cell microwave cavity's 18 modes can act as a synthetic detector array that reconstructs the direction, polarization, and chirp of a high-frequency gravitational-wave signal.
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Gravitational Photon Polarization Twist to Probe the Early Universe and the Galactic Center
A long-baseline laser pulse whose polarization is twisted by gravitational waves could detect galactic-center pulsar and early-universe gravitational wave backgrounds.
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High-Frequency Gravitational Waves on BREAD
BREAD with single photon detectors could detect high-frequency gravitational waves at 0.05 to 200 THz, with projected strains as low as 1e-25 at 200 THz.
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