The development of quantum technologies for information processing, communication and high resolution metrology among other applications has renewed the interest in a better understanding of the dynamics of open quantum systems. The most typical description of an open quantum system evolution is that of a Markovian dynamics caused by the memoryless interaction of a given quantum system with its environment. On the other hand, strong system-environment interaction, environment correlations or initial system-environment correlations may cause memory effects rendering the dynamics non-Markovian. Typically non-Markovian evolutions are associated with a backflow of information. It has been proved that for invertible maps, non-Markovianity is necessarily associated with a recovery of disguinshability between two distinct quantum states. In this talk we would like to explore nonivertible maps, such as totally depolarizing dynamics and amplitude damping. Using information recovery maps, here to be the PETZ recovery map, we quantify how noninvertible one dymanis is compared to other. We also explore the formalism to identify a domain of Markovianity for non-Markovian dynamics.


Seminar, December 5, 2019, 12:30. ICFO’s Yellow Lecture Room

Hosted by Prof. Antonio Acín