Correlation dynamics of three spin under a classical dephasing environment
arXiv:1204.4011 · doi:10.1007/s10773-013-1798-6
Abstract
By starting from the stochastic Hamiltonian of the three correlated spins and modeling their frequency fluctuations as caused by dephasing noisy environments described by Ornstein-Uhlenbeck processes, we study the dynamics of quantum correlations, including entanglement and quantum discord. We prepared initially our open system with Greenberger-Horne-Zeilinger or W state and present the exact solutions for evolution dynamics of entanglement and quantum discord between three spins under both Markovian and non-Markovian regime of this classical noise. By comparison the dynamics of entanglement with that of quantum discord we find that entanglement can be more robust than quantum discord against this noise. It is shown that by considering non-Markovian extensions the survival time of correlations prolong.
13 pages, 4 figures
References in corpus (11)
- Quantum discord and the power of one qubit
- Robustness of quantum discord to sudden death
- Quantum discord and quantum phase transition in spin chains
- Sudden Death of Entanglement: Classical Noise Effects
- Concurrence and a proper monogamy inequality for arbitrary quantum states
- A lower bound of concurrence for multipartite quantum states
- Lower Bounds of Concurrence for Tripartite Quantum Systems
- Quantum Correlations in non-Markovian Environments
- Quantum discord evolution of three-qubit states under noisy channels
- A lower bound of concurrence for multipartite quantum systems
- Correlation dynamics of three spin under a classical dephasing environment