Full-counting statistics and quantum information of dispersive readout with a squeezed environment
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| Format: | Preprint |
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2025
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| _version_ | 1866914177398865920 |
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| author | Li, Ming Luo, JunYan Platero, Gloria Engelhardt, Georg |
| author_facet | Li, Ming Luo, JunYan Platero, Gloria Engelhardt, Georg |
| contents | Motivated by the importance of dispersive readout in quantum technology, we study a prototypical dispersive readout setup that is probed by a squeezed vacuum in a time-reversal-symmetric fashion. To this end, we develop a full-counting-statistics framework for dispersive readout and analyze its measurement information, accompanied by a generalized mean-field approach suitable to deal with non-unitary dynamics. Distinct from conventional input-output theory, our full-counting-statistics approach enables the direct calculation of arbitrary-order cumulants for the measured cumulative (i.e., time-integrated) photonic distribution while maintaining applicability to nonlinear systems. The corresponding Fisher information exhibits an exponential dependence on the squeezing parameter and a robustness against residual nonlinearity, which can even approach the quantum Fisher information, setting an upper limit. This work introduces a conceptually streamlined and computationally efficient framework for continuous quantum measurements, making it well suited for widespread adoption in quantum technologies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_02531 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Full-counting statistics and quantum information of dispersive readout with a squeezed environment Li, Ming Luo, JunYan Platero, Gloria Engelhardt, Georg Quantum Physics Motivated by the importance of dispersive readout in quantum technology, we study a prototypical dispersive readout setup that is probed by a squeezed vacuum in a time-reversal-symmetric fashion. To this end, we develop a full-counting-statistics framework for dispersive readout and analyze its measurement information, accompanied by a generalized mean-field approach suitable to deal with non-unitary dynamics. Distinct from conventional input-output theory, our full-counting-statistics approach enables the direct calculation of arbitrary-order cumulants for the measured cumulative (i.e., time-integrated) photonic distribution while maintaining applicability to nonlinear systems. The corresponding Fisher information exhibits an exponential dependence on the squeezing parameter and a robustness against residual nonlinearity, which can even approach the quantum Fisher information, setting an upper limit. This work introduces a conceptually streamlined and computationally efficient framework for continuous quantum measurements, making it well suited for widespread adoption in quantum technologies. |
| title | Full-counting statistics and quantum information of dispersive readout with a squeezed environment |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.02531 |