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Journal of Physics Conference Series

Measurement for quantum shot noise in a quantum point contact at low temperatures

Masayuki Hashisaka, Y Yamauchi, Shuji Nakamura, Shinya Kasai, Kensuke Kobayashi, Teruo Ono

Published Mar 1, 2008• 26 citations
Publisher

Abstract

We report an experimental development for the high-frequency shot noise measurement system in the 3 He- 4 He dilution refrigerator. The target frequency of the measurement was set to a few MHz with the cross correlation scheme adopted for high accuracy. The system was calibrated by measuring Johnson-Nyquist noise of the quantum point contact (QPC). We prove that our system has enough accuracy for the quantitative evaluation of the quantum shot noise.

DOI
10.1088/1742-6596/109/1/012013

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We report an experimental development for the high-frequency shot noise measurement system in the 3 He- 4 He dilution refrigerator. The target frequency of the measurement was set to a few MHz with the cross correlation scheme adopted for high accuracy. The system was calibrated by measuring Johnson-Nyquist noise of the quantum point contact (QPC). We prove that our system has enough accuracy for the quantitative evaluation of the quantum shot noise.
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We demonstrate a 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 nonequilibrium to generate quantum shot noise. The present mesoscopic bolometry, which is sensitive to the energy flow of $\ensuremath{\sim}1\text{ }\text{fW}$, allows us to detect the energy exchange between quantum systems at finite frequency and can also be applied for diverse precise measurements.
We have operated a quantum point contact (QPC) charge detector in a radio frequency (RF) mode that allows fast charge detection in a bandwidth of tens of megahertz. We find that the charge sensitivity of the RF-QPC is limited not by the noise of a secondary amplifier, but by non-equilibrium noise f the QPC itself. We have performed frequency-resolved measurements of the noise within a 10 MHz bandwidth around our carrier wave. When averaged over our bandwidth, we find that the noise is in good agreement with the theory of photon-assisted shot noise. Our measurements also reveal strong frequency dependence of the noise, asymmetry with respect to the carrier wave, the appearance of sharp local maxima that are correlated with mechanical degrees of freedom in the sample, and noise suppression indicative of many-body physics near the 0.7 structure.
We demonstrate a new scheme to detect the quantum shot noise in coupled mesoscopic systems.\nBy applying the noise thermometry to the capacitively coupled quantum point contacts (QPCs) we\nprove that the noise temperature of one QPC is in perfect proportion to that of the other QPC which\nis driven to non-equilibrium to generate quantum shot noise. The present mesoscopic bolometry,\nwhich is sensitive to the energy flow of » 1 fW, allows us to detect the energy exchange between\nquantum systems at finite frequency and can also be applied for diverse precise measurements.