Since density matrix formalism defines a very general formulation of quantum theory and since the quantum states in zero energy ontology are analogous to operators, the idea that time-like entanglement coefficients in some sense define a square root of density matrix is rather natural. This would give the defining conditions
ρ+= SS+ ,ρ-= S+S , Tr(ρ+/-)=1 .
ρ+/- would define density matrix for positive/negative energy states. In the case HFFs of type II1 one obtains unitary S-matrix and also the analogs of pure quantum states are possible for factors of type I. The numbers p+m,n=|Sm,n2|/ρ+m,m and p-m,n=|Sn,m2|/ρ-m,m give the counterparts of the usual scattering probabilities.
A physically well-motivated hypothesis would be that S has expression S= ρ1/2 S0 such that S0 is a universal unitary S-matrix, and ρ1/2 is square root of a state dependent density matrix. Note that in general S is not diagonalizable in the algebraic extension involved so that it is not possible to reduce the scattering to a mere phase change by a suitable choice of state basis.
What makes this kind of hypothesis aesthetically attractive is the unification of two fundamental matrices of quantum theory to single one. This unification is completely analogous to the combination of modulus squared and phase of complex number to a single complex number: complex valued Schrödinger amplitude is replaced with operator valued one.
For more details about the recent situation concerning the understanding of S-matrix see the revised chapter Construction of Quantum Theory: S-Matrix of "Towards S-matrix".
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