2019/08/30 by Danping Lin, Hong-Mei Zou, Jianhe Yang
Computer Science · Physics and Astronomy · #Amplitude damping channel #Coherence (philosophical gambling strategy) #Non-equilibrium thermodynamics #Open quantum system #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum dissipation #Quantum process #Qubit #quant-ph #stochastic dynamics and bifurcation
paper · pdf · doi:10.1088/1402-4896/ab4012
published as Phys. Scr. 95 (2020) 015103
openalex publication_date 2019/08/30 · openalex created_date 2019/09/05 · arxiv created 2020/12/22 · arxiv updated 2020/12/30 · openalex updated_date 2026/08/05
Abstract In this work, we investigate the non-Markovianity, quantum Fisher information (QFI) and quantum coherence of a qubit in a nonequilibrium environment and have obtained the expressions of QFI and quantum coherence as well as their relationship. We have also discussed in detail the influences of the different environment parameters on these quantum effects. The results show that the suitable parameters of the nonequilibrium environment can retard the QFI and quantum coherence in both Markovian and non-Markovian regions. In addition, the smaller memory effects and the larger the jumping rate, the greater the QFI and quantum coherence. And a larger QFI naturally corresponds to a larger quantum coherence, which indicates that the quantum coherence can enlarge the QFI and can effectively enhance the quantum metrology.