ψ as a Phase Landscape: Quantum Interference as a Fourth Measurement Window

ψ as a Phase Landscape: Quantum Interference as a Fourth Measurement Window This bridge paper extends the Phase Potential Series by adding a fourth, experimentally powerful measurement window: quantum interference. While Papers 1–3 focus on classical weak-field observables, this work makes explicit how the same phase potential ψ appears directly in interferometric phase measurements. The core principle is simple and non-speculative: interferometers measure phase difference. If ψ modifies clock rates and optical path lengths, it necessarily modifies phase accumulation along quantum paths. As a result, atom interferometers, optical clocks, and frequency-transfer experiments become direct probes of the same ψ field. Using the covariant framework of Paper 2, this paper translates the deviation parameters defined in Paper 3 into measurable extra phase terms. No replacement of quantum mechanics is claimed; instead, quantum systems are treated as exceptionally sensitive phase sensors of the gravitational phase landscape. Series context: • Builds on Paper 1 (one ψ, multiple classical windows). • Uses the covariant metric and action structure of Paper 2. • Makes the falsifiable deviation space of Paper 3 experimentally actionable in phase metrology.