У оквиру семинара Групе за гравитацију, честице и поља, у петак, 21. новембра 2025. године у 11:15 у сали 360 Института за физику у Београду, др Игор Прлина (Институт за физику у Београду) одржаће предавање:
Decoherence Limits on Weak-Value Amplification and Their Implications for Low-Energy Probes of High-Energy Physics
САЖЕТАК:
Weak measurements with postselection allow amplification of signals relative to noise far beyond what standard measurements can achieve. In principle, arbitrarily large weak-value amplification could reveal signatures of high-energy physics even in low-energy experiments, provided that sufficiently large ensembles are available. However, this is no longer the case once decoherence is taken into account. In this talk I discuss how decoherence, viewed as an effective non-unitary evolution, limits the achievable weak-value amplification. I analyze a simple thermal decoherence model and apply it to two systems of practical interest: an electron in a magnetic field and a harmonic oscillator. This analysis has a use on its own: the resulting expressions provide approximate methods for extracting decoherence rates from weak-measurement data and for estimating corrections to weak measurement experimental results for which decoherence was originally neglected. Finally, I outline a speculative implication: if weak-value amplification could in principle access high-energy physics at low energies, then decoherence may act as a natural protection mechanism. This motivates the possibility that quantum gravity itself induces fundamental decoherence, preventing low-energy experiments from probing high-energy behavior.
