Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact

Abstract

We report on charge sensing measurements of a GaAs semiconductor quantum dot device using a radio frequency quantum point contact (rf-QPC). The rf-QPC is fully characterized at 4 K and milli-Kelvin temperatures and found to have a bandwidth exceeding 20 MHz. For single-shot charge sensing we achieve a charge sensitivity of 2x10^-4 e/(sqrt)Hz referred to the neighboring dot's charge. The rf-QPC compares favorably with rf-SET electrometers and promises to be an extremely useful tool for characterizing and measuring semiconductor quantum systems on fast timescales.

4 pages, 3 figures

References in corpus (2)

• Single-shot read-out of an individual electron spin in a quantum dot
• Experimental signature of phonon-mediated spin relaxation

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