Collective three-body interactions enable a robust quantum speedup
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917129212657664 |
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| author | Zhang, Haoqing Chu, Anjun Luo, Chengyi Maruko, Chitose Bohr, Eliot A. Thompson, James K. Rey, Ana Maria |
| author_facet | Zhang, Haoqing Chu, Anjun Luo, Chengyi Maruko, Chitose Bohr, Eliot A. Thompson, James K. Rey, Ana Maria |
| contents | We show that collective three-body interactions (3BIs), implementable with $N$ atoms loaded inside an optical cavity, offer a significant advantage for preparing complex multipartite entangled states. Firstly, they enable a speedup of order $\sim N$ in preparing generalized Greenberger-Horne-Zeilinger (GHZ) states, outperforming conventional methods based on all-to-all two-body Ising interactions. Secondly, they saturate the Heisenberg bound in phase estimation tasks using a time-reversal protocol realized through simple rotations and followed by experimentally accessible collective spin measurements. Lastly, compared with two-body interactions (2BIs), in the presence of cavity losses and single particle decoherence, 3BIs feature a high gain in sensitivity for moderate atom numbers and in large ensembles a fast entanglement generation despite constraints in parameter regimes where they are implementable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_06170 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Collective three-body interactions enable a robust quantum speedup Zhang, Haoqing Chu, Anjun Luo, Chengyi Maruko, Chitose Bohr, Eliot A. Thompson, James K. Rey, Ana Maria Quantum Physics We show that collective three-body interactions (3BIs), implementable with $N$ atoms loaded inside an optical cavity, offer a significant advantage for preparing complex multipartite entangled states. Firstly, they enable a speedup of order $\sim N$ in preparing generalized Greenberger-Horne-Zeilinger (GHZ) states, outperforming conventional methods based on all-to-all two-body Ising interactions. Secondly, they saturate the Heisenberg bound in phase estimation tasks using a time-reversal protocol realized through simple rotations and followed by experimentally accessible collective spin measurements. Lastly, compared with two-body interactions (2BIs), in the presence of cavity losses and single particle decoherence, 3BIs feature a high gain in sensitivity for moderate atom numbers and in large ensembles a fast entanglement generation despite constraints in parameter regimes where they are implementable. |
| title | Collective three-body interactions enable a robust quantum speedup |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.06170 |