{"title":"Enhancement in sensitivity of coherent anti-Stokes Raman spectroscopy via SU(1,1) interferometry","authors":"Taj Kumar, Gaurav Shukla, Devendra Kumar Mishra","doi":"10.1007/s00340-024-08382-y","DOIUrl":null,"url":null,"abstract":"<div><p>The sensitivity of coherent anti-Stokes Raman spectroscopy (CARS) is limited by the shot-noise from the probe fields used for stimulation and the non-resonant background noise. We have investigated the performance of the squeezing-enhanced version of CARS under homodyne detection and sum-intensity detection schemes, compared with the shot-noise limit (SNL) and quantum Cramér-Rao bound (QCRB). Our analysis shows homodyne detection performs better than sum-intensity and known single-intensity detection scheme results. It also provides a broader working range and shows more robustness against internal photon losses and remarkably improved performance in the gain-imbalanced configuration of SU(1,1) interferometer. As a result, we expect that our findings will be useful in quantum sensing and imaging techniques.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 2","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics B","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s00340-024-08382-y","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
The sensitivity of coherent anti-Stokes Raman spectroscopy (CARS) is limited by the shot-noise from the probe fields used for stimulation and the non-resonant background noise. We have investigated the performance of the squeezing-enhanced version of CARS under homodyne detection and sum-intensity detection schemes, compared with the shot-noise limit (SNL) and quantum Cramér-Rao bound (QCRB). Our analysis shows homodyne detection performs better than sum-intensity and known single-intensity detection scheme results. It also provides a broader working range and shows more robustness against internal photon losses and remarkably improved performance in the gain-imbalanced configuration of SU(1,1) interferometer. As a result, we expect that our findings will be useful in quantum sensing and imaging techniques.
期刊介绍：
Features publication of experimental and theoretical investigations in applied physics
Offers invited reviews in addition to regular papers
Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more
94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again
Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field.
In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.
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