Enhanced squeezing for quantum gravimetry in a Bose-Einstein condensate with focussing
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arXiv
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| Format: | Preprint |
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2026
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| author | Williamson, Lewis A. Gill, Karandeep Groszek, Andrew J. Davis, Matthew J. Haine, Simon |
| author_facet | Williamson, Lewis A. Gill, Karandeep Groszek, Andrew J. Davis, Matthew J. Haine, Simon |
| contents | Free-fall atom interferometers offer a powerful platform for accurate, absolute gravitational sensing. Szigeti et al. [Phys. Rev. Lett. 125, 100402 (2020)] recently proposed a quantum-enhanced scheme that uses a spin-squeezed Bose-Einstein condensate as an input state to improve the phase sensitivity of the interferometer. The spin squeezing, generated via one-axis twisting interactions, was limited by condensate expansion. Here we present an improved state preparation in which a sudden trapping potential -- a delta kick -- is initially applied to focus the condensate. The resulting increase in density enhances the one-axis-twisting interactions and produces greater spin squeezing. Using multimode truncated-Wigner simulations, we quantify the performance of the interferometer and find that, for an optimal kick strength, the phase sensitivity surpasses the standard quantum limit by a factor of $\sim 20$. This represents a fourfold improvement over the original scheme without the delta kick and is well captured by a two-mode approximation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_10948 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Enhanced squeezing for quantum gravimetry in a Bose-Einstein condensate with focussing Williamson, Lewis A. Gill, Karandeep Groszek, Andrew J. Davis, Matthew J. Haine, Simon Quantum Gases Quantum Physics Free-fall atom interferometers offer a powerful platform for accurate, absolute gravitational sensing. Szigeti et al. [Phys. Rev. Lett. 125, 100402 (2020)] recently proposed a quantum-enhanced scheme that uses a spin-squeezed Bose-Einstein condensate as an input state to improve the phase sensitivity of the interferometer. The spin squeezing, generated via one-axis twisting interactions, was limited by condensate expansion. Here we present an improved state preparation in which a sudden trapping potential -- a delta kick -- is initially applied to focus the condensate. The resulting increase in density enhances the one-axis-twisting interactions and produces greater spin squeezing. Using multimode truncated-Wigner simulations, we quantify the performance of the interferometer and find that, for an optimal kick strength, the phase sensitivity surpasses the standard quantum limit by a factor of $\sim 20$. This represents a fourfold improvement over the original scheme without the delta kick and is well captured by a two-mode approximation. |
| title | Enhanced squeezing for quantum gravimetry in a Bose-Einstein condensate with focussing |
| topic | Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2604.10948 |