Аннотация:We suggest a new method of quantum causal analysis. The causality is defined without
invoking the time relation. It clarifies Cramer principle of weak causality, which admits
time reversal in the entangled states and directly leads to the anticipation. The quantitative
quantum measure of causality is the pseudoscalar velocity of irreversible information
flow called the course of time. The smaller course of time modulus, the stronger
causal connection. The causal parameters for the examples of three-qubit entangled
states have been computed. The results have been compared with the degrees of mixedness
and entanglement of the states. In the simplest cases the formal measure of quantum
causality does not contradict its intuitive understanding. But even in slightly more
complicated situations intuition may be a failure.