Protecting quantum Fisher information of a qubit-qutrit system near the horizon of the Garfinkle-Horowitz-Strominger dilation space-time

doi:10.3969/j.issn.1000-5641.2022.04.012

Abstract

Abstract:

In this study, we investigated the dynamic behavior of quantum Fisher information (QFI) for the qubit-qutrit system suffering from noisy environments by considering quantum memory; the qubit is located near the event horizon of the Garfinkle-Horowitz-Strominger (GHS) dilation black hole and the qutrit stays at the asymptotically flat region. We proposed an effective strategy to protect QFI under the influence of noise by employing weak measurement and reversal measurement. The results show that QFI decays as the amplitude damping strength increases; meanwhile, QFI is nearly constant with an increase in the phase damping strength. QFI can be improved with the selection of appropriate values for measurement strengths and reversal strengths.

Key words: quantum Fisher information (QFI), Garfinkle-Horowitz-Strominger dilation space-time, quantum weak measurement

CLC Number:

O431

Yijun LIAN, Jinming LIU. Protecting quantum Fisher information of a qubit-qutrit system near the horizon of the Garfinkle-Horowitz-Strominger dilation space-time[J]. Journal of East China Normal University(Natural Science), 2022, 2022(4): 120-130.

Figures/Tables 6

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