Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/156065
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dc.contributor.authorIoannou, Christinaen_US
dc.contributor.authorNair, Ranjithen_US
dc.contributor.authorFernandez-Corbaton, Ivanen_US
dc.contributor.authorGu, Mileen_US
dc.contributor.authorRockstuhl, Carstenen_US
dc.contributor.authorLee, Changhyoupen_US
dc.date.accessioned2022-04-04T05:38:38Z-
dc.date.available2022-04-04T05:38:38Z-
dc.date.issued2021-
dc.identifier.citationIoannou, C., Nair, R., Fernandez-Corbaton, I., Gu, M., Rockstuhl, C. & Lee, C. (2021). Optimal circular dichroism sensing with quantum light : multi-parameter estimation approach. Physical Review A, 104(5), 052615-. https://dx.doi.org/10.1103/PhysRevA.104.052615en_US
dc.identifier.issn1050-2947en_US
dc.identifier.urihttps://hdl.handle.net/10356/156065-
dc.description.abstractThe measurement of circular dichroism (CD) has widely been exploited to distinguish the different enantiomers of chiral structures. It has been applied to natural materials (e.g. molecules) as well as to artificial materials (e.g. nanophotonic structures). However, especially for chiral molecules the signal level is very low and increasing the signal-to-noise ratio is of paramount importance to either shorten the necessary measurement time or to lower the minimum detectable molecule concentration. As one solution to this problem, we propose here to use quantum states of light in CD sensing to reduce the noise below the shot noise limit that is encountered when using coherent states of light. Through a multi-parameter estimation approach, we identify the ultimate quantum limit to precision of CD sensing, allowing for general schemes including additional ancillary modes. We show that the ultimate quantum limit can be achieved by various optimal schemes. It includes not only Fock state input in direct sensing configuration but also twin-beam input in ancilla-assisted sensing configuration, for both of which photon number resolving detection needs to be performed as the optimal measurement setting. These optimal schemes offer a significant quantum enhancement even in the presence of additional system loss. The optimality of a practical scheme using a twin-beam state in direct sensing configuration is also investigated in details as a nearly optimal scheme for CD sensing when the actual CD signal is very small. Alternative schemes involving single-photon sources and detectors are also proposed. This work paves the way for further investigations of quantum metrological techniques in chirality sensing.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.language.isoenen_US
dc.relationNRF- NRFF2016-02en_US
dc.relationNRF2017- NRFANR004 Van-QuTeen_US
dc.relationRG162/19en_US
dc.relation.ispartofPhysical Review Aen_US
dc.rights© 2021 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.en_US
dc.subjectScience::Physics::Optics and lighten_US
dc.titleOptimal circular dichroism sensing with quantum light : multi-parameter estimation approachen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.researchComplexity Instituteen_US
dc.identifier.doi10.1103/PhysRevA.104.052615-
dc.description.versionSubmitted/Accepted versionen_US
dc.identifier.scopus2-s2.0-85120003049-
dc.identifier.issue5en_US
dc.identifier.volume104en_US
dc.identifier.spage052615en_US
dc.subject.keywordsQuantum Sensingen_US
dc.subject.keywordsQuantum Opticsen_US
dc.description.acknowledgementThis work was partially supported by the Deutsche Forschungsgemeinschaft (DFG; German Research Foundation) under Germany’s Excellence Strategy via the Excellence Cluster 3D Matter Made to Order (EXC-2082/1–390761711), the VIRTMAT project at KIT, the National Research Foundation Singapore (NRF- NRFF2016-02), NRF Singapore and L’Agence Nationale de la Recherche Joint Project (NRF2017- NRFANR004 Van-QuTe), Singapore Ministry of Education (RG162/19), FQXi (FQXi-RFP-IPW-1903), the Quantum Engineering Program QEP-SP3, and KIAS Individual Grant No. QP081101 via the Quantum Universe Center at Korea Institute for Advanced Study.en_US
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