  There are two types of uncertainties related to the measurements done on a
quantum system: statistical and those related to non-commuting observables and
incompatible measurements. The latter indicates the quantum system's inherent
nature and is in the scope of the present study. We explore uncertainties
related to the interstellar ultrahigh-energy neutrino and introduce a novel
concept: quantum spin-flavour memory. Advanced uncertainty measures are
entropic measures, and the effect of the quantum memory reduces the
uncertainty. The problem in question corresponds to a real physical event:
high-energy Dirac neutrinos emitted by some distant source and propagating
towards the earth. The neutrino has a finite magnetic moment and interacts with
both deterministic and stochastic interstellar magnetic fields. To describe the
effect of a noisy environment, we exploit the Lindblad master equation for the
neutrino density matrix. Quantum spin-flavour memory we quantify in terms of
the generalized Kraus's trade-off relation. This trade-off relation converts to
the equality when quantum memory is absent. We discovered that while most
measures of quantum correlations show their irrelevance, the quantum
spin-flavour discord is the quantifier of the quantum spin-flavour memory.

Quantum Physics;High Energy Physics - Phenomenology;High Energy Physics - Theory