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quant-ph2026
Bayesian Networks of Density Operators
Steffen Lauritzen, Piotr Zwiernik
We study quantum analogues of Bayesian networks on a directed acyclic graph (DAG), distinguishing two constructions for positive definite density operators on finite-dimensional te…
quant-ph2026
The Markov Marginal Problem for Density Operators
Steffen Lauritzen, Piotr Zwiernik
We study when local reduced density operators, viewed as quantum marginals, can be assembled into a global quantum state with a prescribed Markov structure. The starting point is a…