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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.13433 |
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| _version_ | 1866916495594881024 |
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| author | Zhang, Jian-Dong Li, Chuang Hou, Lili Wang, Shuai |
| author_facet | Zhang, Jian-Dong Li, Chuang Hou, Lili Wang, Shuai |
| contents | Quantum phase estimation based on Gaussian states plays a crucial role in many application fields. In this paper, we study the precision bound for the scheme using two-mode squeezed Gaussian states. The quantum Fisher information is calculated and its maximization is used to determine the optimal parameters. We find that two single-mode squeezed vacuum states are the optimal inputs and the corresponding precision bound is superior to the Heisenberg limit by a factor of 2. For practical purposes, we consider the effects originating from photon loss. The precision bound can still outperform the shot-noise limit when the lossy rate is below 0.4. Our work may demonstrate a significant and promising step towards practical quantum metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_13433 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Precision bounds for quantum phase estimation using two-mode squeezed Gaussian states Zhang, Jian-Dong Li, Chuang Hou, Lili Wang, Shuai Quantum Physics Quantum phase estimation based on Gaussian states plays a crucial role in many application fields. In this paper, we study the precision bound for the scheme using two-mode squeezed Gaussian states. The quantum Fisher information is calculated and its maximization is used to determine the optimal parameters. We find that two single-mode squeezed vacuum states are the optimal inputs and the corresponding precision bound is superior to the Heisenberg limit by a factor of 2. For practical purposes, we consider the effects originating from photon loss. The precision bound can still outperform the shot-noise limit when the lossy rate is below 0.4. Our work may demonstrate a significant and promising step towards practical quantum metrology. |
| title | Precision bounds for quantum phase estimation using two-mode squeezed Gaussian states |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2407.13433 |