Discord and entanglement in non-Markovian environments at finite temperatures

Zou, Hong-Mei; Mao-Fa, Fang

doi:10.1088/1674-1056/25/9/090302

Cited by 19 publications

(12 citation statements)

References 45 publications

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“…where λ is the spectral width of the reservoir and γ is the decay rate of the excited state of the qubit. The condition λ > 2γ and λ < 2γ respectively indicate the weak and strong qubit-cavity coupling regimes [57][58][59]. By substituting Eq.…”

Section: Physical Model and Analytical Solutionmentioning

confidence: 99%

Modulating quantum evolution of moving-qubit by using classical driving

Wang,

Yang,

Liu

et al. 2022

Preprint

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In this work, we study quantum evolution of an open moving-qubit modulated by a classical driving field. We obtain the density operator of qubit at zero temperature and analyze its quantum evolution dynamics by using the quantum speed limit time (QSLT) and the non-Markovianity. The results show that both the non-Markovian environment and the classical driving can speed up the evolution process, this quantum speed up process is induced by the non-Markovianity and the critical points only depend on the qubit velocity. Moreover, the qubit motion will delay the evolution process, but this negative effect of the qubit velocity on the quantum speedup can be suppressed by the classical driving. Finally, we give the corresponding physical explanation by using the decoherence rates.

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Section: Physical Model and Analytical Solutionmentioning

confidence: 99%

Modulating quantum evolution of moving-qubit by using classical driving

Wang,

Yang,

Liu

et al. 2022

Preprint

Self Cite

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“…where λ is the spectral width of the reservoir, γ is the dissipative rate. The condition λ > 2γ means the weakcoupling regime, while the condition λ < 2γ indicates the strong-coupling regime that the non-Markovian effect is very obviously [38][39][40]. The correlation function F (t−t 1 ) can be calculated as…”

Section: Physical Model and Analytical Solutionmentioning

confidence: 99%

Quantum speed-up based on classical-field and moving-qubit

Yang,

Liu,

Zou

et al. 2019

Preprint

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In this work, we provide a method of solving the model of a dissipatve moving qubit under the classical field. We obtain the analytic solution of the density operator of the qubit and investigate the quantum speed limit time(QSLT) and the non-Markovianity based on the classical field and the moving velocity of the qubit. The results show that, the transition from Markovian to non-Markovian dynamics is the intrinsic physical reason of the quantum speed-up process, and both of the driving field and the strong-coupling can enhance the non-Markovianity in the dynamics process and speed up the evolution of the qubit, but the moving velocity of the qubit can decrease the non-Markovianity in the dynamics process and delay the evolution of the qubit.

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“…For a weak regime we mean the case λ > 2λ 0 , in this regime the behavior of dynamical evolution of the system is essentially a Markovian exponential decay controlled by λ 0 . In the strong coupling regime, for λ < 2λ 0 , non-Markovian effects become relevant [22,23,24]. We consider the spectrum is peaked on the frequency of the state |E 1− , i.e., ω 1 = ω 0 − Ω, the decay rates for the two dressed states |E 1± are respectively expressed as [26]…”

Section: Atom In Dissipative Cavitymentioning

confidence: 99%

Quantum coherence and non-Markovianity of atom in dissipative cavity under weak measurement

Yu,

Hong-Mei,

Mao-Fa

2018

Preprint

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Quantum coherence and non-Markovianity of an atom in dissipative cavity under weak measurement are investigated in this work. We find that, the quantum coherence obviously depends on the atomic initial state, the strength of the weak measurement and its reversal, the atom-cavity coupling constant and the non-Markovian effecct. The more obvious the weak measurement effect is, the better the protection of coherence is. The quantum coherence is preserved more efficiently for lager the atom-cavity coupling. The stronger the non-Markovian effect, the more slowly the coherence reduces. This is, the quantum coherence can be effectively protected by means of controlling these physical parameters.

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Discord and entanglement in non-Markovian environments at finite temperatures

Cited by 19 publications

References 45 publications

Modulating quantum evolution of moving-qubit by using classical driving

Modulating quantum evolution of moving-qubit by using classical driving

Quantum speed-up based on classical-field and moving-qubit

Quantum coherence and non-Markovianity of atom in dissipative cavity under weak measurement

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