Quantum Physics and Many Worlds

Quan­tum me­chan­ics is our best math­e­mat­i­cal model of the uni­verse to date, pow­er­fully con­firmed by a cen­tury of tests. How­ever, in­ter­pret­ing what the ex­per­i­men­tal re­sults mean—how and when the Shröd­inger equa­tion and Born’s rule in­ter­act—is a topic of much con­tention, with the main dis­agree­ment be­ing be­tween the Everett and the Copen­hagen in­ter­pre­ta­tions.

Yud­kowsky uses this sci­en­tific con­tro­versy as a prov­ing ground for some cen­tral ideas from pre­vi­ous se­quences: map-ter­ri­tory dis­tinc­tions, mys­te­ri­ous an­swers, Bayesi­anism, and Oc­cam’s Ra­zor.

Quan­tum Explanations

Con­figu­ra­tions and Amplitude

Joint Configurations

Distinct Configurations

Col­lapse Postulates

De­co­her­ence is Simple

De­co­her­ence is Falsifi­able and Testable

Priv­ileg­ing the Hypothesis

Liv­ing in Many Worlds

Quan­tum Non-Realism

If Many-Wor­lds Had Come First

Where Philos­o­phy Meets Science

Thou Art Physics

Many Wor­lds, One Best Guess