02/10/2025
Physicists discovered a quantum effect called retrocausality, where present choices seem to influence past events. In delayed-choice experiments, a particle’s behavior appears shaped by measurements made after it traveled, as shown in Wheeler’s proposals and later tests like the delayed-choice quantum eraser (Nature.com). While it doesn’t enable time travel, it challenges cause-and-effect, sparking debate on how to interpret quantum mechanics and the deep interconnection of reality.
