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Dynamics of Quantum Fisher Information in Homodyne-Mediated Feedback Control |
| Li Chen1,2**, Dong Yan1,2, Li-Jun Song2,3, Shou Zhang4 |
1School of Science, Changchun University, Changchun 130022
2Key Laboratory of Materials Design and Quantum Simulation, Changchun University, Changchun 130022
3School of Information Engineering, Jilin Engineering Normal University, Changchun 130052
4Department of Physics, College of Science, Yanbian University, Yanji 133002
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Li Chen, Dong Yan, Li-Jun Song et al 2019 Chin. Phys. Lett. 36 030302 |
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Abstract We investigate the quantum Fisher information (QFI) dynamics of a dissipative two-level system in homodyne-mediated quantum feedback control. The analytical results demonstrate that the maximum values and stable values of the QFI can be greatly enhanced via feedback control. The quantum feedback plays a more evident role in the improvement of classical Fisher information. The classical part can reach a high stable value, while the quantum part eventually decays to zero whatever the feedback parameter is.
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Received: 15 November 2018
Published: 24 February 2019
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 11874004, the Young Foundation of Science and Technology Department of Jilin Province under Grant No 20170520109JH, and the Science Foundation of the Education Department of Jilin Province under Grant No 2016286. |
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