Optimally preserving quantum correlations and coherence with eternally non-Markovian dynamics
Year: 2022
Type: article
Abstract: We demonstrate, both analytically and experimentally, the usefulness of non-Markovianity for preserving correlations and coherence in quantum systems. For this, we consider a broad class of qubit evolutions, having a decoherence matrix separated from zero for large times. While any such Markovian evolution leads to an exponential loss of correlations, non-Markovianity can help to preserve correlations even in the limit t → ∞. In fact, under general assumptions, eternally non-Markovian evolution naturally emerges as the one that allows for optimal preservation of quantum correlations. For covariant qubit evolutions, we also show that non-Markovianity can be used to preserve quantum coherence at all times, which is an important resource for quantum metrology. We explicitly demonstrate this effect experimentally with linear optics, by implementing the optimal non-Markovian quantum evolution.
Source: New Journal of Physics
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,255
Funders: European Commission, National Natural Science Foundation of China, Fundacja na rzecz Nauki Polskiej, University of Science and Technology of China, European Regional Development Fund, National Key Research and Development Program of China, Fundamental Research Funds for the Central Universities
OpenAlex ID: W4280617307