Quantum gravimetry with mechanical qubits

• URL: http://arxiv.org/abs/2604.14950v1
• Date: Thu, 16 Apr 2026 12:47:05 GMT
• Title: Quantum gravimetry with mechanical qubits
• Abstract summary: We propose a quantum gravimetry by directly using the mechanical qubit (QM) formed by a levitated particle as the gravity sensor.<n>Our scheme provides a feasible route toward compact high-sensitivity quantum gravimetry.
• Score: 1.6203750992938977
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Levitated mesoscopic particles hold the promise of revolutionizing gravity sensing by using quantum effects. However, conventional quantum gravimeters based on such systems fail to harness the intrinsic large-mass advantage of the particles, because their commonly utilized auxiliary quantum systems counteract the role of mass as a resource. To overcome this limitation, we propose a quantum gravimetry by directly using the mechanical qubit (QM) formed by a levitated particle as the gravity sensor. Without resorting to the auxiliary quantum system, our scheme enables a straightforward readout of the particle's motion under gravitational influence. The obtained sensitivity behaves as a $m^{-1/2}$-scaling with the mass $m$. We also generalize our scheme to the \textit{mechanical cat qubit} as the gravity sensor. The sensitivity further scales as $N^{-1/2}$ with the mean phonon number $N$. In the experimentally realizable parameter regime, a sensitivity on the order of $0.1~ \text{\textmu}\text{Gal}/\sqrt{\text{Hz}}$ can be achieved, which outperforms the traditional schemes by two orders of magnitude. Reaching the \textit{double standard quantum limits} with $m$ and $N$ simultaneously, our scheme provides a feasible route toward compact high-sensitivity quantum gravimetry.

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