| Download | - View final version: Metrological advantages in seeded and lossy nonlinear interferometers (PDF, 2.1 MiB)
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| DOI | Resolve DOI: https://doi.org/10.22331/q-2025-02-04-1619 |
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| Author | Search for: Kranias, Jasper1; Search for: Thekkadath, Guillaume2ORCID identifier: https://orcid.org/0000-0002-4366-2245; Search for: Heshami, Khabat2ORCID identifier: https://orcid.org/0000-0003-3864-1930; Search for: Goldberg, Aaron Z.2ORCID identifier: https://orcid.org/0000-0002-3301-7672 |
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| Affiliation | - National Research Council Canada. Security and Disruptive Technologies
- National Research Council Canada. Quantum and Nanotechnologies
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| Funder | Search for: NSERC Discovery Grant |
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| Format | Text, Article |
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| Abstract | The quantum Fisher information (QFI) bounds the sensitivity of a quantum measurement, heralding the conditions for quantum advantages when compared with classical strategies. Here, we calculate analytical expressions for the QFI of nonlinear interferometers under lossy conditions and with coherent-state seeding. We normalize the results based on the number of photons going through the sample that induces a phase shift on the incident quantum state, which eliminates some of the previously declared metrological advantages. We analyze the performance of nonlinear interferometers in a variety of geometries and robustness of the quantum advantage with respect to internal and external loss through direct comparison with a linear interferometer. We find the threshold on the internal loss at which the quantum advantage vanishes, specify when and how much coherent-state seeding optimally counters internal loss, and show that a sufficient amount of squeezing confers to the quantum advantages robustness against external loss and inefficient detection. |
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| Publication date | 2025-02-04 |
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| Publisher | Verein zur FoĢrderung des Open Access Publizierens in den Quantenwissenschaften |
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| Licence | |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | cd8230a8-1c6e-482a-b444-9b295fafa3a3 |
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| Record created | 2025-06-12 |
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| Record modified | 2025-06-12 |
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