Bright and dark periods in the entanglement dynamics of interacting qubits in contact with the environment

Das, Sumanta; Agarwal, G. S.

doi:10.1088/0953-4075/42/14/141003

Cited by 41 publications

(43 citation statements)

References 43 publications

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“…Generally speaking, the amplitude of concurrence decays rapidly at the initial process owing to the interaction between the qubits and their environment, and then rebounds before eventually trending to a constant value because the tunable terms in (1) have larger contributions than decay terms from the environment at a longer evolving time. It is worth mentioning here that, for the case of ω = 0, we can get the ESD as shown by Das and Agarwal [33][34][35]. For the case of ω = 0 with ζ = 8 1 , we see from Fig.…”

Section: Concurrence For the Antiferromagnetically Coupled Qubitssupporting

confidence: 61%

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Entangled Subspaces for Two Coupled Qubits in a Normal Environment

2011

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By investigating the effect of environmental perturbations on two initially coupled qubits, we find that the interactions between the qubits and between the qubits and the environment are not only the source of decoherence, but also the power of avoiding disentanglement. It is shown that there are the entangled subspaces for four kinds of different coupling ways between the qubits, in which the qubits preserve entanglement all the time. Thus, any new coherent source does not be introduced to preserve entanglement in the entangled subspaces.

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Section: Concurrence For the Antiferromagnetically Coupled Qubitssupporting

confidence: 61%

“…However, the feature of bright and dark periods in the evolving curve of concurrence is not found in Fig. 1 due to the existence of ω, which is different from the results given by Das and Agarwal [33][34][35]. Note that, for the parameters ζ = 9 1 and ζ = 10 1 , Fig.…”

Section: Concurrence For the Antiferromagnetically Coupled Qubitscontrasting

confidence: 55%

Entangled Subspaces for Two Coupled Qubits in a Normal Environment

2011

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“…For specific initial states, the entanglement generated by the dissipative evolution may exhibit a delayed feature, which is called the delayed sudden birth of entanglement [18][19][20][21]. In particular, it has been found that for a two-atom system with a nonvanishing separation immersed in a thermal bath, entanglement sudden birth only happens for atoms with an appropriate separation in a thermal bath at sufficiently small temperatures, while entanglement sudden death is a general feature [21].…”

Section: Introductionmentioning

confidence: 99%

Entanglement dynamics for uniformly accelerated two-level atoms

2015

Phys. Rev. A

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We study, in the paradigm of open quantum systems, the entanglement dynamics of two uniformly accelerated atoms with the same acceleration perpendicular to the separation. The two-atom system is treated as an open system coupled with a bath of fluctuating massless scalar fields in the Minkowski vacuum, and the master equation that governs its evolution is derived. It has been found that, for accelerated atoms with a nonvanishing separation, entanglement sudden death is a general feature when the initial state is entangled, while for those in a separable initial state, entanglement sudden birth only happens for atoms with an appropriate interatomic separation and sufficiently small acceleration. Remarkably, accelerated atoms can get entangled in certain circumstances while the inertial ones in the Minkowski vacuum cannot. A comparison between the results of accelerated atoms and those of static ones in a thermal bath shows that uniformly accelerated atoms exhibit features distinct from those immersed in a thermal bath at the Unruh temperature in terms of entanglement dynamics.

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“…Differently from Ref. [23] in the Markov approximation, however, our model includes interaction between the coupled qubit system and the environment in the non-Markov process. By choosing the symmetric coupling between the qubit and the environment, therefore, the effect of environment would disappear similar to the non-decoherence subspace, which may be an effect way to avoid the entanglement decay.…”

Section: Entanglement Dynamicsmentioning

confidence: 99%

Influence of Interaction Between Qubits on Entanglement Sudden Death and Birth

Wang

2010

Int J Theor Phys

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Dynamic evolution of entanglement is studied for coupling two-qubit system in non-Markov environment in terms of concurrence. We find that the degree of entanglement depends on the initial quantum state of the system and the interaction between the two-qubit system and the environment. When the interaction between the qubits and the environment is completely symmetric, especially, the environment has no effect on the entanglement, where the decoherence is entirely resulted from the interaction between qubits. By controlling the coupling way of the interaction, thus, one may avoid the entanglement sudden death (ESD).

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Bright and dark periods in the entanglement dynamics of interacting qubits in contact with the environment

Cited by 41 publications

References 43 publications

Entangled Subspaces for Two Coupled Qubits in a Normal Environment

Entangled Subspaces for Two Coupled Qubits in a Normal Environment

Entanglement dynamics for uniformly accelerated two-level atoms

Influence of Interaction Between Qubits on Entanglement Sudden Death and Birth

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