The Role of Auxiliary Stages in Gaussian Quantum Metrology
The optimization of the passive and linear networks employed in quantum metrology, the field that studies and devises quantum estimation strategies to overcome the levels of precision achievable via classical means, appears to be an essential step in certain metrological protocols achieving the ulti...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/9/5/345 |
| _version_ | 1797496432695967744 |
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| author | Danilo Triggiani Paolo Facchi Vincenzo Tamma |
| author_facet | Danilo Triggiani Paolo Facchi Vincenzo Tamma |
| author_sort | Danilo Triggiani |
| collection | DOAJ |
| description | The optimization of the passive and linear networks employed in quantum metrology, the field that studies and devises quantum estimation strategies to overcome the levels of precision achievable via classical means, appears to be an essential step in certain metrological protocols achieving the ultimate Heisenberg-scaling sensitivity. This optimization is generally performed by adding degrees of freedom by means of auxiliary stages, to optimize the probe before or after the interferometric evolution, and the choice of these stages ultimately determines the possibility to achieve a quantum enhancement. In this work we review the role of the auxiliary stages and of the extra degrees of freedom in estimation schemes, achieving the ultimate Heisenberg limit, which employ a squeezed-vacuum state and homodyne detection. We see that, after the optimization for the quantum enhancement has been performed, the extra degrees of freedom have a minor impact on the precision achieved by the setup, which remains essentially unaffected for networks with a larger number of channels. These degrees of freedom can thus be employed to manipulate how the information about the structure of the network is encoded into the probe, allowing us to perform quantum-enhanced estimations of linear and non-linear functions of independent parameters. |
| first_indexed | 2024-03-10T03:03:33Z |
| format | Article |
| id | doaj.art-3c070cb883344771a50027b6288a898b |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T03:03:33Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-3c070cb883344771a50027b6288a898b2023-11-23T12:41:09ZengMDPI AGPhotonics2304-67322022-05-019534510.3390/photonics9050345The Role of Auxiliary Stages in Gaussian Quantum MetrologyDanilo Triggiani0Paolo Facchi1Vincenzo Tamma2School of Mathematics and Physics, University of Portsmouth, Portsmouth PO1 3QL, UKDipartimento di Fisica and MECENAS, Università di Bari, I-70126 Bari, ItalySchool of Mathematics and Physics, University of Portsmouth, Portsmouth PO1 3QL, UKThe optimization of the passive and linear networks employed in quantum metrology, the field that studies and devises quantum estimation strategies to overcome the levels of precision achievable via classical means, appears to be an essential step in certain metrological protocols achieving the ultimate Heisenberg-scaling sensitivity. This optimization is generally performed by adding degrees of freedom by means of auxiliary stages, to optimize the probe before or after the interferometric evolution, and the choice of these stages ultimately determines the possibility to achieve a quantum enhancement. In this work we review the role of the auxiliary stages and of the extra degrees of freedom in estimation schemes, achieving the ultimate Heisenberg limit, which employ a squeezed-vacuum state and homodyne detection. We see that, after the optimization for the quantum enhancement has been performed, the extra degrees of freedom have a minor impact on the precision achieved by the setup, which remains essentially unaffected for networks with a larger number of channels. These degrees of freedom can thus be employed to manipulate how the information about the structure of the network is encoded into the probe, allowing us to perform quantum-enhanced estimations of linear and non-linear functions of independent parameters.https://www.mdpi.com/2304-6732/9/5/345quantum metrologyquantum sensingdistributed parameterheisenberg limittypicalitygaussian metrology |
| spellingShingle | Danilo Triggiani Paolo Facchi Vincenzo Tamma The Role of Auxiliary Stages in Gaussian Quantum Metrology Photonics quantum metrology quantum sensing distributed parameter heisenberg limit typicality gaussian metrology |
| title | The Role of Auxiliary Stages in Gaussian Quantum Metrology |
| title_full | The Role of Auxiliary Stages in Gaussian Quantum Metrology |
| title_fullStr | The Role of Auxiliary Stages in Gaussian Quantum Metrology |
| title_full_unstemmed | The Role of Auxiliary Stages in Gaussian Quantum Metrology |
| title_short | The Role of Auxiliary Stages in Gaussian Quantum Metrology |
| title_sort | role of auxiliary stages in gaussian quantum metrology |
| topic | quantum metrology quantum sensing distributed parameter heisenberg limit typicality gaussian metrology |
| url | https://www.mdpi.com/2304-6732/9/5/345 |
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