Assumption: Regulated radiation sectors

We use orthogonal outgoing energy-eigenmode sectors:

1. a key block $R_1$ with $d^2$ orthogonal one-particle states $|r⟩$, all of energy $e_{\mathrm{K}}>0$;

2. each transfer block $R_t$, $2\le t\le N$, with vacuum of energy zero and $d$ orthogonal one-particle states $J_t|i⟩$, all of energy $e>0$;

3. an endpoint radiation space with the energy-labelled orthogonal states specified in Section sec:endpoint.

All these states have the same declared charge and angular-momentum labels within their respective occupation sectors; in the explicit neutral implementation these labels vanish.

Sufficient degeneracy is assumed in the residual source sectors. No Bekenstein–Hawking state-count formula is assigned to them.