期刊
NEW JOURNAL OF PHYSICS
卷 25, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/acba3a
关键词
non-Markovianity; quantum information; open quantum systems; quantum correlations; Gaussian systems
We study the influence of the number of employed modes on the ability to witness non-Markovian evolutions in continuous-variable quantum dynamics. We find that the presence of multiple ancillary modes can cause correlation backflows in non-Markovian Gaussian evolutions, unlike the case with a single ancillary mode. This activation phenomenon occurs when three-mode states are employed, with only one mode undergoing the evolution, and is observed in both entanglement and steering correlations under two different Gaussian evolution models.
We study how the number of employed modes impacts the ability to witness non-Markovian evolutions via correlation backflows in continuous-variable quantum dynamics. We first prove the existence of non-Markovian Gaussian evolutions that do not show any revivals in the correlations between the mode evolving through the dynamics and a single ancillary mode. We then demonstrate how this scenario radically changes when two ancillary modes are considered. Indeed, we show that the same evolutions can show correlation backflows along a specific bipartition when three-mode states are employed, and where only one mode is subjected to the evolution. These results can be interpreted as a form of activation phenomenon in non-Markovianity detection and are proven for two types of correlations, entanglement and steering, and two classes of Gaussian evolutions, a classical noise model and the quantum Brownian motion model.
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