Quantum discord of the two-atom system in non-Markovian environments

Zou, Hong-Mei; Mao-Fa, Fang; Guo, You-neng; Yang, Bai-Yuan

doi:10.1088/0031-8949/90/3/035104

Cited by 7 publications

(7 citation statements)

References 29 publications

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“…If λ > 2γ 0 , the relaxation time is greater than the reservoir correlation time and the dynamical evolution of the system is essentially Markovian. For λ < 2γ 0 , the reservoir correlation time is greater than or of the same order as the relaxation time and non-Markovian effects become relevant [27][28][29]. When the spectrum is peaked on the frequency of the state |E 1− , i.e.…”

Section: Two-atom System In Dissipative Cavitiesmentioning

confidence: 99%

Population Dynamics of Excited Atoms in Dissipative Cavities

2016

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Population dynamics of excited atoms in dissipative cavities is investigated in this work. We present a method of controlling populations of excited atoms in dissipative cavities. For the initial state |ee AB |00 ab , the repopulation of excited atoms can be obtained by using atom-cavity couplings and non-Markovian effects after the atomic excited energy decays to zero. For the initial state |gg AB |11 ab , the two atoms can also be populated to the excited states from the initial ground states by using atom-cavity couplings and nonMarkovian effects. And the stronger the atom-cavity coupling or the non-Markovian effect is, the larger the number of repopulation of excited atoms is. Particularly, when the atomcavity coupling or the non-Markovian effect is very strong, the number of repopulation of excited atoms can be close to one in a short time and will tend to a steady value in a long time.

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Section: Two-atom System In Dissipative Cavitiesmentioning

confidence: 99%

Population Dynamics of Excited Atoms in Dissipative Cavities

2016

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“…While ω c > ω 0 indicates the converse case, which the quantum information is quickly dissipated, the evolution behaviour of the system is Markovian. The smaller the value of η is, the longer the reservoir correlation time is, and the more obvious the non-Markovian effect is [52][53][54].…”

Section: Physical Modelmentioning

confidence: 99%

Ohmic Reservoir-based non-Markovianity and Quantum Speed Limit Time

Zou,

Liu,

Long

et al. 2020

Preprint

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The non-Markovianity and the quantum speed limit time (QSLT) are investigated in Jaynes-Cummings model coupling with the Ohmic reservoir at zero temperature when when t = 0 and N = 1. We obtain the non-Markovianity expressed by using the decoherence rate in the time-local master equation. We find that the non-Markovianity in the dynamics process can be witnessed by both of the negative decoherence rate and the positive derivative of the trace distance. The atomcavity coupling is the main physical reasons of the transition from Markovian to non-Markovian dynamics and the quantum speed-up process of the atom, which the critical value of this sudden transition only depends on the Ohmicity parameter. The atom-cavity coupling and the appropriate reservoir parameters can effectively improve the non-Markovianity in the dynamics process and speed up the evolution of the atom. Moreover, the initial non-Markovian dynamics first turns into Markovian and then back to non-Markovian with increasing the atom-cavity coupling under certain condition. We also provide the physical interpretation.

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“…In the strong coupling regime, λ < 2γ 0 (i.e., τ S < 2τ R ), the non-Markovian effects become relevant. [36] Inserting Eq. ( 7) into Eq.…”

Section: Physical Modelmentioning

confidence: 99%

Discord and entanglement in non-Markovian environments at finite temperatures

Zou¹,

Mao-Fa²

2016

Chinese Phys. B

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The dynamics evolutions of discord and entanglement of two atoms in two independent Lorentzian reservoirs at zero or finite temperature have been investigated by using the time-convolutionless master-equation method. Our results show that, when both the non-Markovian effect and the detuning are present simultaneously, due to the memory and feedback effect of the non-Markovian reservoirs, the discord and the entanglement can be effectively protected even at nonzero temperature by increasing the non-Markovian effect and the detuning. The discord and the entanglement have different robustness for different initial states and their robustness may changes under certain conditions. Nonzero temperature can accelerate the decays of discord and entanglement and induce the entanglement sudden death.

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Quantum discord of the two-atom system in non-Markovian environments

Cited by 7 publications

References 29 publications

Population Dynamics of Excited Atoms in Dissipative Cavities

Population Dynamics of Excited Atoms in Dissipative Cavities

Ohmic Reservoir-based non-Markovianity and Quantum Speed Limit Time

Discord and entanglement in non-Markovian environments at finite temperatures

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