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Sensitive Radio-Frequency Measurements of a Quantum Dot by Tuning to Perfect Impedance Matching

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Figure

FIG. 1.(a) Experimental setup. A gate-defined quantum dot (electron micrograph right, with ohmic contacts denoted by boxes) isCcoupled to an impedance-matching network formed from an inductor L (223 nH), variable capacitors CS and CM (tuned through thecirc
Fig. 3, which characterizes the sensitivity by detecting the
FIG. 4.(a),(b) Comparison of SNR close to perfect matchingfrequency and voltage setting so as not to broaden the Coulombpeaksf(VS ¼ 13.5 V) and away from perfect matching (VS ¼ 9 V),with modulation applied to the gate voltage VL
FIG. 5.(a) Demodulated response of the circuit as a function ofϕ for VL set on (green dashed) and off (blue solid) a Coulombpeak with Vbias ¼ 0

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