Quantum filtering for a two-level atom driven by two counter-propagating photons

Zhiyuan Dong, Guofeng Zhang, Nina H. Amini

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


The purpose of this paper is to propose quantum filters for a two-level atom driven by two continuous-mode counter-propagating photons and under continuous measurements. Two scenarios of multiple measurements are discussed: (1) homodyne detection plus photodetection and (2) two homodyne detections. Filtering equations for both cases are derived explicitly. As demonstration, the two input photons with rising exponential and Gaussian pulse shapes are used to excite a two-level atom under two homodyne detection measurements. Simulations reveal scaling relations between atom-photon coupling and photonic pulse shape for maximum atomic excitation.

Original languageEnglish
Article number136
JournalQuantum Information Processing
Issue number5
Publication statusPublished - 25 Mar 2019


  • Continuous-mode single-photon states
  • Homodyne detection
  • Photodetection
  • Quantum filtering
  • Two-level atom

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Theoretical Computer Science
  • Signal Processing
  • Modelling and Simulation
  • Electrical and Electronic Engineering


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