High- Q Milligram-Scale Monolithic Pendulum for Quantum-Limited Gravity Measurements

Seth B. Cataño-Lopez, Jordy G. Santiago-Condori, Keiichi Edamatsu, Nobuyuki Matsumoto

Research output: Contribution to journalArticle

Abstract

We present the development of a high-Q monolithic silica pendulum weighing 7 milligram. The measured Q value for the pendulum mode at 2.2 Hz was 2.0×106. To the best of our knowledge this is the lowest dissipative milligram-scale mechanical oscillator to date. By employing this suspension system, the optomechanical displacement sensor for gravity measurements we recently reported in Matsumoto et al. [Phys. Rev. Lett. 122, 071101 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.071101] can be improved to realize quantum-noise-limited sensing at several hundred hertz. In combination with the optical spring effect, the amount of intrinsic dissipation measured in the pendulum mode is enough to satisfy requirements for measurement-based quantum control of a massive pendulum confined in an optical potential. This paves the way for not only testing dark matter via quantum-limited force sensors, but also Newtonian interaction in quantum regimes, namely, between two milligram-scale oscillators in quantum states, as well as improving the sensitivity of gravitational-wave detectors.

Original languageEnglish
Article number221102
JournalPhysical review letters
Volume124
Issue number22
DOIs
Publication statusPublished - 2020 Jun 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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