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

Abstract : 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, 1) homodyne detection plus photodetection, and 2) two homodyne detections, are discussed. 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.
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https://hal.archives-ouvertes.fr/hal-02374923
Contributor : Nina H. Amini <>
Submitted on : Thursday, November 21, 2019 - 5:37:21 PM
Last modification on : Saturday, May 1, 2021 - 3:49:05 AM

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Zhiyuan Dong, Guofeng Zhang, Nina H. Amini. Quantum filtering for a two-level atom driven by two counter-propagating photons. Quantum Information Processing, Springer Verlag, 2019, 18 (5), pp.136. ⟨10.1007/s11128-019-2258-x⟩. ⟨hal-02374923⟩

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