Quantum Fisher information analysis for absorption measurements with undetected photons
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866912862544330752 |
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| author | Houde, Martin Roeder, Franz Silberhorn, Christine Brecht, Benjamin Quesada, Nicolás |
| author_facet | Houde, Martin Roeder, Franz Silberhorn, Christine Brecht, Benjamin Quesada, Nicolás |
| contents | We theoretically compare the quantum Fisher information (QFI) for three configurations of absorption spectroscopy with undetected idler photons: an SU(1,1) interferometer with inter-source idler loss, an induced-coherence (IC) setup in which the idler partially seeds a second squeezer together with a vacuum ancilla, and a distributed-loss (DL) scheme with in-medium attenuation. We calculate the QFI as a function of parametric gain for both full and signal-only detection access. For losses below 99% and low to moderate gain, the SU(1,1) configuration provides the largest QFI. At high gain and intermediate loss, the IC scheme performs best, while under extreme attenuation (transmission $<$ 1%) the DL model becomes optimal. These results delineate the measurement regimes in which each architecture is optimal in terms of information theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16941 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum Fisher information analysis for absorption measurements with undetected photons Houde, Martin Roeder, Franz Silberhorn, Christine Brecht, Benjamin Quesada, Nicolás Quantum Physics Optics We theoretically compare the quantum Fisher information (QFI) for three configurations of absorption spectroscopy with undetected idler photons: an SU(1,1) interferometer with inter-source idler loss, an induced-coherence (IC) setup in which the idler partially seeds a second squeezer together with a vacuum ancilla, and a distributed-loss (DL) scheme with in-medium attenuation. We calculate the QFI as a function of parametric gain for both full and signal-only detection access. For losses below 99% and low to moderate gain, the SU(1,1) configuration provides the largest QFI. At high gain and intermediate loss, the IC scheme performs best, while under extreme attenuation (transmission $<$ 1%) the DL model becomes optimal. These results delineate the measurement regimes in which each architecture is optimal in terms of information theory. |
| title | Quantum Fisher information analysis for absorption measurements with undetected photons |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2601.16941 |