Fast single-charge sensing with a rf quantum point contact

By D. Reilly, Charles M. Marcus, M. Hanson, Arthur C. Gossard. 2007

272 citations recorded by the source corpus.

We report high-bandwidth charge sensing measurements using a GaAs quantum point contact embedded in a radio frequency impedance matching circuit (rf-QPC). With the rf-QPC biased near pinch-off where it is most sensitive to charge, we demonstrate a conductance sensitivity of 5×10−6e2∕hHz−1∕2 with a bandwidth of 8MHz. Single-shot readout of a proximal few-electron double quantum dot is investigated in a mode where the rf-QPC back action is rapidly switched.

View Paper: https://www.semanticscholar.org/paper/1fbc2d4d2735e19792bb3d36090c3b875e84c422

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8. M. Babaie

Citations in the corpus

• Cryo-CMOS Circuits and Systems for Quantum Computing Applications (2018, methodology): “For the spin-qubit readout, an LNA can be employed to sense the reflection coefficient at the end of a 50- line connected to the charge sensor in a so-called reflectometry readout [32], [34].”