This photonic audit follows one small source chain from photon energy to split counts, dark-port clicks, and a reported rail label. The pinned ledger keeps 8 photons at 6 joules each, splits them into 4 plus 4, and checks 6 recorded clicks against the claimed logical 1 rail report. Real photonic hardware still has loss, alignment drift, phase error, detector efficiency, dark counts, and finite-count uncertainty, so the audit is a consistency check rather than a full device guarantee.
The capstone joins energy, split, interference, detector, and rail checks through typed source references. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
The audit starts with the photon energy source
The conserved spine uses 8 photons at 6 joules each, so the cited total is 48 joules.
8⋅6=48
The split and phase sources keep the same count
The splitter cites 8 to 4 plus 4. Opposite phase sends 8 counts to the dark detector.
4+4=8
Detector and rail claims are source-bound
The dark-port detector receives 8 photons and records 6 clicks. The rail source reports logical 1.