Enter, 03-VII-E, 2026, pp. 1-26
Observation boundaries for destructive quantum readout and external geometry
Ngo Cheung
2026
Abstract
We specify an observation boundary for a finite linearly typed quantum interface with destructive computational-basis readout and primitive classical geometric labels. Geometric rules inspect declared labels; coupling rules inspect declared matter observables; control and resource checks are part of the interface. Under spectator-blind control, arbitrary extensions with the same accessible reduced state preserve geometric traces and accessible matter states. A restricted coherent implementation of destructive readout agrees with immediate readout on their common record–matter output. For a channel T, coarse effects E_w, and aggregated fine effects Π_w, record compatibility is equivalent to T^{*}(E_w) = Π_w. The exact unassisted worst-case total-variation error is a maximum of operator norms over outcome events. Exact record compatibility extends to untouched entangled references, but does not determine residual instruments. For sharp measurements and a coarse Lüders instrument, full compatibility is characterized exactly by the removal of fine coherence within each coarse outcome. A compositional criterion identifies when continuations preserve agreement on a declared observable algebra. One complete four-face adjacency exchange illustrates the interface. It is induced by a prescribed slicing of a fixed conical spacetime and has explicit charts, edge laws, a compact collar, a transition stratum, an exact guard, location transport, and a decoder-correct finite reversible implementation. The general interface results are independent of this example. A separate dictionary proves three linear observation rules for distributional comparisons without assuming any particular renormalized composite.
Bibliographic record
- Title
- Observation boundaries for destructive quantum readout and external geometry
- Author
- Cheung, Ngo
- Publication date
- 2026
- Institution
- Enter
- Report number
- 03-VII-E
- Publisher
- Cheung Ngo Medical Limited
- First page
- 1
- Last page
- 26
- Language
- en