Geometric Quantum Discord of a Two-Qutrit System Under Decoherence at Finite Temperature
The dynamics and protection of geometric quantum discord (GQD) for a two-qutrit system under amplitude damping channel with finite temperature have been studied in detail. By using of a lower bound of GQD, numerical results show that the GQD dynamics suffering from amplitude damping channels is more robust against the decoherence at lower temperature. Moreover, by combining weak measurement with measurement reversal, we have also investigated the protecting of the GDQ for a two-qutrit system under decoherence. It is found that the measurement technique can effectively protect the GQD against decoherence at lower temperature, but fails to protect GQD at higher temperature of channel.
KeywordsGeometric quantum discord Finite temperature Weak measurement and measurement reversal
This research is supported by the National Natural Science Foundation of China (Grant Nos.11747107 and 11374096), the Scientific Research Project of Hunan Province Department of Education (Grant Nos.16C0134 and 17C0133), the Natural Science Foundation of Hunan Province (Grant No.2017JJ3346 and 14JJ2134), Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education (QSQC1403 and QSQC1411) and the Project of Science and Technology Plan of Changsha (ZD1601071 and K1705022).
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