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Quantum-enhanced passive remote sensing

Köse, Emre; Adesso, Gerardo; Braun, Daniel

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Emre Köse

Daniel Braun


We investigate theoretically the ultimate resolution that can be achieved with passive remote sensing in the microwave regime used, e.g., on board of satellites observing Earth, such as the soil moisture and ocean salinity (SMOS) mission. We give a fully quantum mechanical analysis of the problem, starting from thermal distributions of microscopic currents on the surface to be imaged that lead to a mixture of coherent states of the electromagnetic field which are then measured with an array of antennas. We derive the optimal detection modes and measurement schemes that allow one to saturate the quantum Cramér-Rao bound for the chosen parameters that determine the distribution of the microscopic currents. For parameters comparable to those of SMOS, a quantum enhancement of the spatial resolution by more than a factor of 20 should be possible with a single measurement and a single detector, and a resolution down to the order of 1 m and less than a 110 K for the theoretically possible maximum number of measurements.

Journal Article Type Article
Acceptance Date Jun 6, 2022
Online Publication Date Jul 6, 2022
Publication Date Jul 6, 2022
Deposit Date Jul 22, 2022
Publicly Available Date Jul 22, 2022
Journal Physical Review A
Print ISSN 2469-9926
Electronic ISSN 2469-9934
Publisher American Physical Society (APS)
Peer Reviewed Peer Reviewed
Volume 106
Issue 1
Article Number 012601
Public URL
Publisher URL


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