Analysis of the conditional average and conditional variance of dissipated energy in the driven spin-boson model

Abstract

We investigate the conditional average and the conditional variance of dissipated energy considering, as a prototypical example, a driven spin-boson system. We follow a measurement protocol in which the spin is prepared in a certain initial state before undergoing a periodic driving. Subsequently, the spin is projected onto a post-selected final state. We compare the conditional average of dissipated energy to the lower bound which directly follows from the well known fluctuation relations. We further report that a special selection of the initial (pre-selected) and final (post-selected) spin states leads to an enhanced energy emission with simultaneous noise suppression at driving times of order of the relaxation time.