Revival of quantum correlations without system-environment back-action
By Rosario Lo Franco, B. Bellomo, Erika Andersson, Giuseppe Compagno. 2010
152 citations recorded by the source corpus.
Revivals of quantum correlations have often been explained in terms of back-action on quantum systems by their quantum environment(s). Here we consider a system of two independently evolving qubits, each locally interacting with a classical random external field. The environments of the qubits are also independent, and there is no back-action on the qubits. Nevertheless, entanglement, quantum discord and classical correlations between the two qubits may revive in this model. We explain the revivals in terms of correlations in a classical-quantum state of the environments and the qubits. Although classical states cannot store entanglement on their own, they can play a role in storing and reviving entanglement. It is important to know how the absence of back-action, or modelling an environment as classical, affects the kind of system time evolutions one is able to describe. We find a class of global time evolutions where back-action is absent and for which there is no loss of generality in modelling the environment as classical. Finally, we show that the revivals can be connected with the increase of a parameter used to quantify non-Markovianity of the single-qubit dynamics.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/ef16a8a90f66f5f178e645ac2fc32be2f1400bbf
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- The classical-quantum boundary for correlations: Discord and related measures (2011, background): “(Franco et al., 2012) show that discord and entanglement have revivals even when the environment is classical.”
- Dynamics of non-Markovian open quantum systems (2015, background): “Revivals of quantum correlations may also occur when the environment is classical (Bordone et al., 2012; Franco et al., 2012; Lo Franco et al., 2012; Xu et al., 2013; Zhou et al., 2010) and thus it does not have a back-action into the system.”