What is this work?
Past-Selection Filtrations (PSF) studies what physical quantum records can tell us about earlier alternatives and interference. The framework tracks which measurements are accessible as records accumulate. More access can improve our ability to distinguish alternatives; it does not itself cause physical collapse. The current paper develops coherence bounds and calibrated echo predictions within quantum mechanics, with their assumptions stated explicitly.
The Accessible Quantum Past: Record Information, Coherence Bounds, and Echo Tests
PSF research preprint · Version 9.0.2 · September 7, 2026
Toward experimental tests
Can calibration determine the range of outcomes of a later echo experiment? The paper retains every ordinary quantum channel allowed by its declared local-noise model and gives counterexamples when that model is broadened. Three-state coherence compatibility provides a separate mathematical review target. Experimental validation, a practical quantum-computing benefit, and a distinctive physical selector law remain open research goals.