Quantum resolution limit via coherent polarization Raman spectroscopy Academic Article uri icon

abstract

  • AbstractAs one of the milestones in earlyera nonlinear Raman studies, Akhmanov et al. [Sov. Phys. JETP 47, 667 (1978)] and Koroteev et al. [Phys. Rev. Lett. 43, 398 (1979)] have demonstrated that polarization coherent antiStokes Raman scattering (CARS) spectroscopy can resolve overlapping spectral lines that cannot be resolved by means of spontaneous Raman scattering spectroscopy and argued that the resolution of this method is unlimited. Here, we show that information theory offers useful insights into this remarkable result. We demonstrate that spectral superresolution attainable in polarization CARS can be understood in terms of the Fisher information and the pertinent CramrRao lower bound. We show that, with a suitable polarization arrangement, coherent Raman scattering can be tailored to yield superresolving spectral modes that provide a nonvanishing Fisher information even for deeply subRayleigh spectral features, preventing the variance of spectral measurements from diverging no matter how fine these spectral features are. When the nonresonant coherent background scattering can be efficiently suppressed, the Fisher information of such superresolving modes reaches its upper bound as dictated by its quantum versionthe quantum Fisher information.

published proceedings

  • JOURNAL OF RAMAN SPECTROSCOPY

author list (cited authors)

  • Zheltikov, A. M.

citation count

  • 0

complete list of authors

  • Zheltikov, Aleksei M

publication date

  • June 2022

publisher