Fig. The density plot of Fisher information for the (a) quantum and (b) classical cases in the Lambda-type system.
Our article, "Fisher information analysis for quantum-enhanced parameter estimation in an electromagnetically-induced-transparency spectrum with single photons" has been published online on 21 September 2023 in Physical Review A!
Fisher information analysis for quantum-enhanced parameter estimation in an electromagnetically-induced-transparency spectrum with single photons
Pin-Ju Tsai, Lun-Ping Yuan, and Ying-Cheng Chen Phys. Rev. A 108, 033711 – Published 21 September 2023
ABSTRACT
Electromagnetically induced transparency (EIT) spectroscopy has been used for the development of sensitive sensors for quantum metrology applications. The sensitivity of a sensor is strongly dependent on the measurement precision of the EIT spectrum. In this work, we present a theoretical study of spectral lineshape measurement of three-level Λ -type EIT media based on Fisher information (FI) analysis. Using two kinds of probing sources, the single-photon Fock state and the coherent state, we calculate the FI in an EIT medium and quantify the quantum advantage and limitations of the single-photon probe. The analysis of the FI structure also provides a clear picture for classifying the spectral lineshape into two different regimes, EIT and Aulter-Townes splitting (ATS). This work provides a systematic analysis of the single-photon EIT spectrum, which provides essential knowledge of quantum sensing based on EIT and deepens our understanding of the spectral characteristics of the Λ -type media.
Comments