[hep-th] seminar, petak, 21. novembar

[Maja Buric]

Pozdrav svima,

u petak 21. novembra u standardnom terminu (11.15, Teorijski seminar, IPB)
Igor Prlina ce odrzati predavanje:


Title: Decoherence Limits on Weak-Value Amplification and Their 
Implications for 
Low-Energy Probes of High-Energy Physics

Abstract:
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.


Vidimo se, pozdrav Maja