Enhanced frequency estimation by non-Gaussianity of Fock states
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918349914505216 |
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| author | Santos, Jonas F. G. |
| author_facet | Santos, Jonas F. G. |
| contents | Leveraging the unique quantum properties of non-Gaussian states is crucial for advancing continuous variable quantum technologies. Recent experimental advancements in generating non-Gaussian states, coupled with theoretical findings of their superior performance in quantum information protocols compared to Gaussian states, motivate this investigation. This work investigates the impact of non-Gaussianity on the precision of frequency estimation using a quantum probe. We analyze a single bosonic mode and its non-Gaussian excited states as a system, while the frequency estimation is investigated by explicitly computing the quantum Fisher information. Our results demonstrate a significant enhancement in the quantum Fisher information for non-Gaussian states compared to Gaussian states with equivalent second-order moments. Importantly, we find that the increased quantum Fisher information achieved with non-Gaussian states outweighs their higher energetic cost compared to the Gaussian ground state. We also briefly discuss two photonic non-Gaussian state generation schemes: interaction with an ancillary system and the use of photon number measurement on the photonic probe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_14870 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhanced frequency estimation by non-Gaussianity of Fock states Santos, Jonas F. G. Quantum Physics Leveraging the unique quantum properties of non-Gaussian states is crucial for advancing continuous variable quantum technologies. Recent experimental advancements in generating non-Gaussian states, coupled with theoretical findings of their superior performance in quantum information protocols compared to Gaussian states, motivate this investigation. This work investigates the impact of non-Gaussianity on the precision of frequency estimation using a quantum probe. We analyze a single bosonic mode and its non-Gaussian excited states as a system, while the frequency estimation is investigated by explicitly computing the quantum Fisher information. Our results demonstrate a significant enhancement in the quantum Fisher information for non-Gaussian states compared to Gaussian states with equivalent second-order moments. Importantly, we find that the increased quantum Fisher information achieved with non-Gaussian states outweighs their higher energetic cost compared to the Gaussian ground state. We also briefly discuss two photonic non-Gaussian state generation schemes: interaction with an ancillary system and the use of photon number measurement on the photonic probe. |
| title | Enhanced frequency estimation by non-Gaussianity of Fock states |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2505.14870 |