Bolometric Detection of Quantum Shot Noise in Coupled Mesoscopic Systems

TL;DR

This paper introduces a novel bolometric method to detect quantum shot noise in coupled mesoscopic systems, revealing proportional noise temperatures and an unexpected cooling effect in quantum point contacts.

Contribution

It demonstrates a new noise detection scheme using noise thermometry on capacitively coupled QPCs, highlighting the proportionality of noise temperatures and a cooling phenomenon.

Findings

Noise temperature of one QPC is proportional to that of the other.

Quantum shot noise can be detected via bolometric methods.

Unexpected suppression of noise suggests cooling effects in QPCs.

Abstract

We present a new scheme to detect the quantum shot noise in coupled mesoscopic systems. By applying the noise thermometry to the capacitively coupled quantum point contacts (QPCs) we prove that the noise temperature of one QPC is in perfect proportion to that of the other QPC which is driven to non-equilibrium to generate quantum shot noise. We also found an unexpected effect that the noise in the source QPC is remarkably suppressed possibly due to the cooling effect by the detector QPC.