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Title: Experimental investigation of linear-optics-based quantum target detection
Authors: Gu, Mile
Aguilar, G. H.
de Souza, M. A.
Gomes, R. M.
Thompson, J.
Céleri, L. C.
Walborn, S. P.
Keywords: Quantum Entanglement
Quantum Metrology
Issue Date: 2019
Source: Aguilar, G. H., de Souza, M. A., Gomes, R. M., Thompson, J., Gu, M., Céleri, L. C., & Walborn, S. P. (2019). Experimental investigation of linear-optics-based quantum target detection. Physical Review A, 99(5), 053813-. doi:10.1103/PhysRevA.99.053813
Series/Report no.: Physical Review A
Abstract: The development of new techniques to improve measurements is crucial for all sciences. By employing quantum systems as sensors to probe some physical property of interest allows the application of quantum resources, such as coherent superpositions and quantum correlations, to increase measurement precision. Here we experimentally investigate a scheme for quantum target detection based on linear optical measurement devices, when the object is immersed in unpolarized background light. By comparing the quantum (polarization-entangled photon pairs) and the classical (separable polarization states) strategies, we found that the quantum strategy provides us an improvement over the classical one in our experiment when the signal-to-noise ratio is greater than 1/40, or about 16 dB of noise. This is in constrast to quantum target detection considering nonlinear optical detection schemes, which have shown resilience to extreme amounts of noise. A theoretical model is developed which shows that, in this linear-optics context, the quantum strategy suffers from the contribution of multiple background photons. This effect does not appear in our classical scheme. By improving the two-photon detection electronics, it should be possible to achieve a polarization-based quantum advantage for a signal-to-noise ratio that is close to 1/400 for current technology.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.99.053813
Rights: © 2019 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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