Causal Analysis of the Quantum States Available to Purchase

We suggest quantum generalization of the method of causal analysis used before only for the classical variables. The causality parameters for the series of examples of two‐qubit entangled states are computed. The results are compared with the concurrence and degree of mixedness of the states. The role of state asymmetry in quantum information transfer is shown. For the qubits under nonuniformity external magnetic field the nontrivial role of this nonuniformity for subsystem causal connection has been studied. At last quantum causal analysis helps to understand Cramer principle of week causality which admits extraction of information from the future without the classical paradoxes.