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Title: Optimal circular dichroism sensing with quantum light : multi-parameter estimation approach
Authors: Ioannou, Christina
Nair, Ranjith
Fernandez-Corbaton, Ivan
Gu, Mile
Rockstuhl, Carsten
Lee, Changhyoup
Keywords: Science::Physics::Optics and light
Issue Date: 2021
Source: Ioannou, 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-.
Project: NRF- NRFF2016-02
NRF2017- NRFANR004 Van-QuTe
Journal: Physical Review A
Abstract: The 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.
ISSN: 1050-2947
DOI: 10.1103/PhysRevA.104.052615
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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