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Quantum illumination using polarization-path entangled single photons for low reflectivity object detection in a noisy background

Muhammed Shafi, K. and Padhye, A. and Chandrashekar, C.M. (2023) Quantum illumination using polarization-path entangled single photons for low reflectivity object detection in a noisy background. In: Optics Express, 31 (20). pp. 32093-32104.

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Official URL: https://doi.org/10.1364/OE.496776


Detecting object with low reflectivity embedded within a noisy background is a challenging task. Quantum correlations between pairs of quantum states of light, though are highly sensitive to background noise and losses, offer advantages over traditional illumination methods. Instead of using correlated photon pairs which are sensitive, we experimentally demonstrate the advantage of using heralded single-photons entangled in polarization and path degree of freedom for quantum illumination. In the study, the object of different reflectivity is placed along the path of the signal in a variable thermal background before taking the joint measurements and calculating the quantum correlations. We show the significant advantage of using non-interferometric measurements along the multiple paths for single photon to isolate the signal from the background noise and outperform in detecting and ranging the low reflectivity objects even when the signal-to-noise ratio is as low as 0.03. Decrease in visibility of polarization along the signal path also results in similar observations. This will have direct relevance to the development of single-photon based quantum LiDAR and quantum imaging. © 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

Item Type: Journal Article
Publication: Optics Express
Publisher: Optica Publishing Group (formerly OSA)
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Degrees of freedom (mechanics); Object detection; Optical radar; Particle beams; Photons; Polarization; Quantum entanglement; Signal to noise ratio, Background loss; Background noise; Detecting objects; Illumination method; Objects detection; Quantum correlations; Quantum illuminations; Quantum state; Single photons; States of light, Reflection
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 10 Nov 2023 03:45
Last Modified: 10 Nov 2023 03:45
URI: https://eprints.iisc.ac.in/id/eprint/83314

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