Loss and complete number readout

These are the complete-record distinctions made concretely in Em03-B/C and the extraction interfaces in Em05-A/B CheungEm03B,CheungEm03C,CheungEm05A,CheungEm05B. No independence of two packet records is assumed. A shared passive collection port must obey a contraction budget: if ${\mathbf{b}}_{\det }=T{\mathbf{b}}_{\mathrm{in}}+R\mathbf{e}$, then

It cannot be represented as two independent perfect copies of the same incident mode.