Activating information backflow with the assistance of quantum SWITCH

Abstract

There are certain dynamics while being non-Markovian, do never exhibit information backflow. We show that if two such dynamical maps are considered in a scenario where the order of application of these two dynamical maps are not definite, the effective channel can manifest information backflow. In particular, we use quantum SWITCH to activate such a channel. In contrast, activation of those channels are not possible even if one uses many copies of such channels in series or in parallel action. We then investigate the dynamics behind the quantum SWITCH experiment and find out that after the action of quantum SWITCH both the CP (Complete Positive)- divisibility and P (Positive)- divisibility of the channel breaks down, along with the activation of information backflow. Our study elucidate the advantage of quantum SWITCH by investigating its dynamical behavior.

10+2 pages and 4 figures, Closed to published version

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Cited by in corpus (6)

• Memory in quantum processes with indefinite time direction and causal order
• Interplay between the Hilbert-space dimension of a control system and the memory induced by a quantum SWITCH
• Emergent non-Markovianity and dynamical quantification of the quantum switch
• Optimal quantum precision in noise estimation: Is entanglement necessary?
• Information back-flow in quantum non-Markovian dynamics and its connection to teleportation
• Stochastic unravelings for Heisenberg picture and trace-nonpreserving dynamics