Assessing non-Markovian dynamics through moments of the Choi state
Bivas Mallick, Saheli Mukherjee, Ananda G. Maity, A. S. Majumdar
Abstract
Non-Markovian effects in open quantum system dynamics usually manifest the backflow of information from the environment to the system, indicating complete-positive divisibility breaking of the dynamics. We provide a criterion for witnessing such non-Markovian dynamics exhibiting information backflow, based on partial moments of Choi matrices. The moment condition determined by the positive semi-definiteness of a matrix does not hold for a Choi state describing non-Markovian dynamics. We then present some explicit examples in support of our proposed non-Markovianity detection scheme. Finally, a moment-based measure of non-Markovianity for unital dynamics is formulated.
Topics & Concepts
BackflowDivisibility rulePositive definitenessMarkov processDynamics (music)Statistical physicsMathematicsMoment (physics)Measure (data warehouse)Applied mathematicsMatrix (chemical analysis)State (computer science)Computer sciencePositive-definite matrixPhysicsPure mathematicsQuantum mechanicsStatisticsAlgorithmEigenvalues and eigenvectorsInletMechanical engineeringComposite materialMaterials scienceEngineeringDatabaseAcousticsQuantum Information and CryptographyQuantum Mechanics and ApplicationsQuantum Computing Algorithms and Architecture