Metrological Advantages in Seeded and Lossy Nonlinear Interferometers
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-s...
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| Format: | Article |
| Language: | English |
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Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2025-02-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2025-02-04-1619/pdf/ |
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| author | Jasper Kranias Guillaume Thekkadath Khabat Heshami Aaron Z. Goldberg |
| author_facet | Jasper Kranias Guillaume Thekkadath Khabat Heshami Aaron Z. Goldberg |
| author_sort | Jasper Kranias |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-6223c245226449728ff3e2380ef8043e |
| institution | Kabale University |
| issn | 2521-327X |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften |
| record_format | Article |
| series | Quantum |
| spelling | doaj-art-6223c245226449728ff3e2380ef8043e2025-02-04T16:26:54ZengVerein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenQuantum2521-327X2025-02-019161910.22331/q-2025-02-04-161910.22331/q-2025-02-04-1619Metrological Advantages in Seeded and Lossy Nonlinear InterferometersJasper KraniasGuillaume ThekkadathKhabat HeshamiAaron Z. GoldbergThe 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.https://quantum-journal.org/papers/q-2025-02-04-1619/pdf/ |
| spellingShingle | Jasper Kranias Guillaume Thekkadath Khabat Heshami Aaron Z. Goldberg Metrological Advantages in Seeded and Lossy Nonlinear Interferometers Quantum |
| title | Metrological Advantages in Seeded and Lossy Nonlinear Interferometers |
| title_full | Metrological Advantages in Seeded and Lossy Nonlinear Interferometers |
| title_fullStr | Metrological Advantages in Seeded and Lossy Nonlinear Interferometers |
| title_full_unstemmed | Metrological Advantages in Seeded and Lossy Nonlinear Interferometers |
| title_short | Metrological Advantages in Seeded and Lossy Nonlinear Interferometers |
| title_sort | metrological advantages in seeded and lossy nonlinear interferometers |
| url | https://quantum-journal.org/papers/q-2025-02-04-1619/pdf/ |
| work_keys_str_mv | AT jasperkranias metrologicaladvantagesinseededandlossynonlinearinterferometers AT guillaumethekkadath metrologicaladvantagesinseededandlossynonlinearinterferometers AT khabatheshami metrologicaladvantagesinseededandlossynonlinearinterferometers AT aaronzgoldberg metrologicaladvantagesinseededandlossynonlinearinterferometers |