Dynamics of tripartite quantum correlations in mixed classical environments: The joint effects of the random telegraph and static noises

Abstract

In the present paper, the joint effects of two kinds of classical environmental noises, without direct interaction among each other, on the dynamics of quantum correlations (QCs) of a three-qubit system coupled in independent environments is investigated. More precisely, we join the random telegraph noise (RTN) and the static noise (SN) and focus on the dynamics of entanglement and quantum discord (QD) when the qubits are initially prepared in the GHZ- and W-type states. The overall noise affecting the qubits is obtained by combining the RTN and SN in two different setups. The results show that the disorder of the environmental noise as well as its memory qualities and the purity of the initial state considered play a crucial role in the time evolution of the system in such a way that the dynamics of QCs can be controlled by varying them. In fact, we show that, depending on the initial state and noise regime considered, the rate of collapse of QCs may either decrease or increase with the increase of the degree of disorder of the SN, the switching rate of the RTN and the purity of the initial state.

Probing tripartite entanglement and coherence dynamics in pure and mixed independent classical environments

“…3 and 7. In comparison, the current results under both mixed noisy configurations differ completely from those defined in [91] for joint dephasing effects of static and random telegraph noise. In addition, the qualitative dynamical behaviour of the entanglement, purity, and decoherence coincides with one another and with previous findings.…”

“…The slopes decay faster as the value of g increases, indicating the dephasing nature of the parameter. We also find the current dephasing effects under the current mixed noisy situation completely different from that of the non-Gaussian noises, such as of random and static nature investigated in [47,48,61,88,89].…”

“…Excluding the decay rates, all the three measures showed consistent results, indicating good agreement among them. The current detrimental effects resemble the decay caused by the Ornstein Uhlenbeck noise [83,84,88] but strongly disagree with the dephasing effects because of non-Gaussian noises given in [47,48,55,61].…”

“…This paper aims to investigate the dynamics of entanglement and coherence for a system of three non-interacting qubits initially prepared as maximally entangled Greenberger-Horne-Zeilinger (X GHZ ) state in pure and mixed independent classical noisy environments. These environments are further assumed to be described by power-law (PL) and fractional Gaussian (FG) noise [61][62][63].…”

Decoherence and protection of entanglement of a system of three qubits driven by a classical Gaussian distributed fluctuating field

“…In recent year, the dynamics of quantum correlations in the situation where quantum systems are affected by environments describes classically (i.e., model by means of a classical Gaussian or non-Gaussian distributed random field) has been an active area of research [6,7,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] and many interesting results have been obtained. In particular, it has been shown that when three qubits are coupled to an external classical noise such as random telegraph noise [16][17][18], static noise [20] and colored noise [19,21] in a common environment, quantum correlations among them survive indefinitely.…”