Processor, film, album, and library analogies

and coherent film. A processor scrambles a pure prepared code and releases unequal quantum cells. The receiver keeps those cells coherently. The Haar hypothesis supplies the finite Page mean. Replacing the equal-cell clock by a compatible release schedule changes the horizontal axis, not the output type.

album. Installing Enter on every emitted cell produces an append-only classical record. Its exact proxy entropy mean is (eq:RecordMean), not (eq:PageMean). Later clicks may improve answers to classical questions, but they cannot restore an arbitrary unknown quantum state from that record. Postprocessing an entanglement-breaking channel remains entanglement breaking HorodeckiShorRuskai,CheungEm03F.

strip. For a classical message $L$, more photographs can decrease $H(L\mid Y_{\le k})$ while the full album entropy increases. For a quantum strip, photographs retain outcomes rather than coherent fragments. Successful quantum recovery needs coherent fragments or another explicitly accessible quantum carrier.

cards. Photocopies can reconstruct known-alphabet classical text. A classical index can also select a decoder acting on a genuine quantum output. It is not itself the unknown quantum book. Emptying a named drawer does not erase unreturned purifiers or measurement environments.

A coherent packet decoder in a declared source-field model is a useful comparison, not a local Schwarzschild receiver CheungEm03G. The analogy's usefulness is preserved by stating that missing identification.