Remote sensing with quantum-enhanced Raman spectroscopy

The integration of quantum-enabled technology into remote sensing revolutionizes sensitivity and accuracy, enabling the detection of subtle environmental changes, biochemical markers, hazardous materials, and other critical targets beyond the reach of traditional sensors. <br/> <br/> We have developed advanced remote sensing methodologies by integrating linearly chirped pulses into Coherent Anti-Stokes Raman Scattering (C-CARS) [1-4] and Fractional Stimulated Raman Adiabatic Passage (CFSTIRAP) [5], thereby enhancing their performance. This integration facilitates the generation of highly directional, backward-propagating signals, significantly amplifies signal intensity, and reduces noise by optimizing coherence within the target species, which ensures superior detection accuracy. <br/> <br/> The proposed methodologies open new possibilities for precise and reliable sensing in complex and challenging environments, paving the way for groundbreaking applications in high-resolution climate monitoring, secure long-range communication, and precise material analysis over vast distances [6]. <br/> <br/> The work is partially supported the Office of Naval Research through award N00014-22-1-2374. <br/> <br/> [1] J. Chathanathil, S. A. Malinovskaya, Chirped pulse control of Raman coherence in atoms and molecules. Adv. Quant. Chem. 89, 225-289 (2024). <br/> [2] J. Chathanathil, D. Budker, S. A. Malinovskaya, Quantum control via chirped coherent anti-Stokes Raman spectroscopy, Quantum Sci. Tech. 8, 045005 (2023). <br/> [3] J. Chathanathil, G. Lui, S. A. Malinovskaya, A semi-classical control theory of Coherent Anti-Stokes Raman Scattering (CARS) maximizing vibrational coherence for remote detection, Phys. Rev. A 104, 043701 (2021). <br/> [4] N. Pandya, G. Lui, F. A. Narducci, J. Chathanathil, S. A. Malinovskaya, Creation of the maximum coherence via adiabatic passage in the four-wave mixing process of coherent anti-Stokes Raman scattering, Chem. Phys. Lett., 738, 136763 (2020). <br/> [5] J. Chathanathil, A. Ramaswamy, V. S. Malinovsky, D. Budker, S. A. Malinovskaya, Chirped fractional stimulated Raman adiabatic passage, Phys. Rev. A 108, 043710 (2023). <br/> [6] G. Liu, F. A. Narducci, S. A. Malinovskaya, Limits to remote molecular detection via coherent anti-Stokes Raman spectroscopy using a maximal coherence control technique, J. Mod. Opt. 67, 21-25 (2020).