Information backflow may not indicate quantum memory
| Autor: | Michał Banacki, Marcin Marciniak, Karol Horodecki, Paweł Horodecki |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physical Review A. 107 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | We analyze recent approaches to quantum Markovianity and how they relate to the proper definition of quantum memory. We point out that the well-known criterion of information backflow may not correctly report character of the memory falsely signaling its quantumness. Therefore, as a complement to the well-known criteria, we propose several concepts of elementary dynamical maps. Maps of this type do not increase distinguishability of states which are indistinguishable by von Neumann measurements in a given basis. Those notions and convexity allows us to define general classes of processes without quantum memory in a weak and strong sense. Finally, we provide a practical characterization of the most intuitive class in terms of the new concept of witness of quantum information backflow. Comment: 7 pages, 2 figures |
| Databáze: | OpenAIRE |
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