Decoherent dynamics of quantum correlations in qubit–qutrit systems

Enhancement of quantum correlations in qubit–qutrit system under decoherence of finite temperature

“…In ref [26], the authors have studied how weak measurement can be used for entanglement protection of two qubits interacting with environment at finite temperature. In our previous studies, we find that the qubit-qutrit system possess rich properties of quantum correlations under various decoherent channels [27] and the research dealing with protecting quantum correlations of a qubit-qutrit system is scarce. Therefore, in this paper, concerning with a qubit-qutrit system exposed in the nonzero temperature environment, we study the dynamics and the protection of quantum correlations, including entanglement and quantum discord, in such a situation based on weak measurement and measurement reversal.…”

An easy measure of quantum correlation

“…The final quantum correlation of the bipartite state (8), based on the definition (6), is then C(ρ) = 1 3 18 − 2 81 − 56 p 4 , which is a monotonically increasing function of the parameter p, ranging from the minimum value C min = 0 for p = 0 to the maximum value C max = 2 √ 2 3 for p = 1. In the case of p = 1, the above state (8) turns to a pure state |ψ , whose quantum correlation is equal to its quantum entanglement of Negativity.…”

“…This nonlocal effect, usually called "quantum correlation", cannot be interpreted by any local hidden variable theory and plays the vital role in quantum information processing, such as better-than classical communication and information protocols [1,2], quantum computing without entanglement [3], and nolocal-broadcasting [4]. Furthermore, many evidences show that quantum correlation is more robust than entanglement against decoherence, so that quantum algorithms based on quantum correlation may be more robust than those based on entanglement B Jie-Hui Huang jhhuang@jxnu.edu.cn 1 College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China [5][6][7]. In many circumstances, we need to know whether a state can be used in a quantum information task or to what extent a quantum state can help do it.…”

Quantum Correlations in Qutrit-Qutrit Systems under Local Quantum Noise Channels

“…Recent studies on open quantum systems highlight the existence of two different classes of dynamical behaviours known as Markovian and non-Markovian regimes [36,37]. In the quantum domain, under certain assumptions, Markovian dynamics lead to a master equation in the Lindblad form.…”

“…He has found that the quantum entanglement will decrease after a finite time under dicoherence. Guo et al [37] studied the dynamics of quantum correlations of qubitqutrit systems under various decoherent channels. They have shown that the decoherent channels bring with different influences for the dynamics of quantum correlations measured by negativity, quantum discord and GD.…”