CHICAGO — Measurement Quantization’s two-slit treatment separates an extended interference distribution from the single record of a completed detection. The source locates the pattern in the relative phase of coherent realized encodings. It does not require several simultaneous macroscopic records for one detected event and does not report a new interference experiment.

Two coherent alternatives contribute amplitudes before the detection density is formed. Squaring their sum produces individual intensity contributions and a phase-dependent cross term. Depending on relative phase, the cross term enhances or suppresses the predicted density. Figure 1 distinguishes that ensemble prediction from a completed record and the predictions conditioned on it.

In the source’s ideal optical example, a wavelength of 500 nm, slit spacing of 0.50 mm, slit width of 0.10 mm and screen distance of 1.00 m give a central modulation scale of 1.00 mm, rounded. A single-slit envelope multiplies the interference modulation. These are selected model inputs and calculated shapes, not fitted measurements.

The Internal Frame is the relational count-configuration domain. The System Frame is the realized encoding in which screen coordinates, phase and detection probabilities are expressed. The Frames mapping connects them. Interference is assigned to the realized coherent description, rather than to a photographed microscopic path or simultaneous completed alternatives.

Path marking changes the physical context by correlating the alternatives with distinguishable detector or environmental states. The retained cross term depends on the marker overlap. Fully distinguishable alternatives remove it from the unconditioned reduced description; partial marking can leave partial interference. A human decision to read the marker is not the cause of this change.

A normalized probability distribution does not by itself specify which physical record a particular interaction produces. The source uses a completed contextual realization and a disjoint, exhaustive record partition to assign one label. The public measurement explanation explicitly distinguishes that construction from a derived detector-specific interaction.

Independent experiments have established event-by-event interference buildup and context-dependent path-marking effects. Reproducing those familiar features within MQ is a theoretical correspondence result. It does not independently validate its primitive ontology or demonstrate a new departure from quantum predictions.

The technical Brief provides the cross-term identity, normalization conditions, source optical calculation, exact finite output example and record-probability equation. It also distinguishes peak-scaled density curves from probabilities integrated over detector regions.

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