A “quantum time machine” — idea from "The Two‑State Vector Formalism" by Yakir Aharonov & Lev Vaidman
Using superpositions of tiny gravitational time dilations- imagine surrounding your system with heavy shells at slightly different radii so time ticks just a bit slower inside each - Aharonov et al. show how to combine these into one huge time shift. By putting the “clock‑maker” itself into a quantum superposition of “shell at radius R₁,” “shell at radius R₂,” … and then post‑selecting the perfect superposition, you can make your system’s wavefunction evolve as if it jumped forward or even backward in time by a large interval. It’s a purely gedanken experiment (the success probability is vanishingly small), but it vividly illustrates how time‑symmetrized quantum mechanics can blur past and future.
#Complexity #RTM
