Quantum Noise from a Bohmian perspective: fundamental understanding and practical computation in electron devices

摘要

In the literature, the study of electron transport in quantum devices ismainly devoted to DC properties. The fluctuations of the electrical currentaround these DC values, the so-called quantum noise, are much less analyzed.The computation of quantum noise is intrinsically linked (by temporalcorrelations) to our ability to understand/compute the time-evolution of aquantum system that is measured several times. There are several quantumtheories that provide different (but empirically equivalent) ways ofunderstanding/computing the perturbation of the wave function when it ismeasured. In this work, quantum noise associated to an electron impinging upona semitransparent barrier is explained using Bohmian mechanics (which dealswith wave functions and point-like particles). From this result, thefundamental understanding and practical computation of quantum noise withBohmian trajectories are discussed. Numerical simulations of low and highfrequency features of quantum shot noise in a resonant tunneling diode arepresented (through the BITLLES simulator), showing the usefulness of theBohmian approach.