Chip-scale superconducting quantum gravimeter combining a SQUID, a transmon, and a nanomechanical resonator
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| Format: | Preprint |
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2026
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| _version_ | 1866914524822503424 |
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| author | Wani, Salman Sajad Khan, Mughees Ahmed Naqash, Abrar Ahmed Al-Kuwari, Saif |
| author_facet | Wani, Salman Sajad Khan, Mughees Ahmed Naqash, Abrar Ahmed Al-Kuwari, Saif |
| contents | Precise gravitational measurements are vital for geophysics and inertial navigation, but compact gravimeters with high measurement bandwidth remain difficult to realize. We propose and analyze a chip-scale superconducting gravimeter in which a flux-tunable transmon qubit is coupled to a high quality factor ($Q_m$) nanomechanical beam. The beam is embedded in a SQUID loop placed in parallel with the qubit's flux-tunable SQUID; gravity induced beam displacement therefore modulates the qubit frequency through the SQUID flux and is mapped onto the qubit's geometric phase. A stroboscopic readout at mechanical revival times suppresses qubit mechanics dephasing, yielding a projected sensitivity of $10^2$--$10^3\,\mathrm{nGal}/\sqrt{\mathrm{Hz}}$ with sub-millisecond interrogation times. Electrical \emph{in situ} tunability and microwave-based calibration make this architecture a practical route toward compact, high-bandwidth on-chip gravimetry. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_00425 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Chip-scale superconducting quantum gravimeter combining a SQUID, a transmon, and a nanomechanical resonator Wani, Salman Sajad Khan, Mughees Ahmed Naqash, Abrar Ahmed Al-Kuwari, Saif Quantum Physics Precise gravitational measurements are vital for geophysics and inertial navigation, but compact gravimeters with high measurement bandwidth remain difficult to realize. We propose and analyze a chip-scale superconducting gravimeter in which a flux-tunable transmon qubit is coupled to a high quality factor ($Q_m$) nanomechanical beam. The beam is embedded in a SQUID loop placed in parallel with the qubit's flux-tunable SQUID; gravity induced beam displacement therefore modulates the qubit frequency through the SQUID flux and is mapped onto the qubit's geometric phase. A stroboscopic readout at mechanical revival times suppresses qubit mechanics dephasing, yielding a projected sensitivity of $10^2$--$10^3\,\mathrm{nGal}/\sqrt{\mathrm{Hz}}$ with sub-millisecond interrogation times. Electrical \emph{in situ} tunability and microwave-based calibration make this architecture a practical route toward compact, high-bandwidth on-chip gravimetry. |
| title | Chip-scale superconducting quantum gravimeter combining a SQUID, a transmon, and a nanomechanical resonator |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.00425 |