Using a quantum dot as a high-frequency shot noise detector

Abstract

We present the experimental realization of a Quantum Dot (QD) operating as a high-frequency noise detector. Current fluctuations produced in a nearby Quantum Point Contact (QPC) ionize the QD and induce transport through excited states. The resulting transient current through the QD represents our detector signal. We investigate its dependence on the QPC transmission and voltage bias. We observe and explain a quantum threshold feature and a saturation in the detector signal. This experimental and theoretical study is relevant in understanding the backaction of a QPC used as a charge detector.

4 pages, 4 figures, accepted for publication in Physical Review Letters

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• Shot Noise in Mesoscopic Conductors
• Single-shot read-out of an individual electron spin in a quantum dot
• Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors
• Transient current spectroscopy of a quantum dot in the Coulomb blockade regime
• Relaxation and Zeno effect in qubit measurements
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