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

被引：49

作者：

Ares, N. ^{[1
]}

Schupp, F. J. ^{[1
]}

Mavalankar, A. ^{[1
]}

Rogers, G. ^{[1
]}

Griffiths, J. ^{[2
]}

Jones, G. A. C. ^{[2
]}

Farrer, I. ^{[2
]}

Ritchie, D. A. ^{[2
]}

Smith, C. G. ^{[2
]}

Cottet, A. ^{[3
]}

Briggs, G. A. D. ^{[1
]}

Laird, E. A. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

[3] Univ Paris Diderot, Univ Paris 06, Lab Pierre Aigrain,Ecole Normale Super, PSL Res Univ,Sorbonne Univ,Sorbonne Paris Cite, 24 Rue Lhomond, F-75231 Paris 05, France

来源：

PHYSICAL REVIEW APPLIED | 2016年 / 5卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

SINGLE-ELECTRON TRANSISTOR; READOUT;

D O I：

10.1103/PhysRevApplied.5.034011

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electrical readout of spin qubits requires fast and sensitive measurements, which are hindered by poor impedance matching to the device. We demonstrate perfect impedance matching in a radio-frequency readout circuit, using voltage-tunable varactors to cancel out parasitic capacitances. An optimized capacitance sensitivity of 1.6 aF/root Hz is achieved at a maximum source-drain bias of 170-mu V root-mean-square and with a bandwidth of 18 MHz. Coulomb blockade in a quantum-dot is measured in both conductance and capacitance, and the two contributions are found to be proportional as expected from a quasistatic tunneling model. We benchmark our results against the requirements for single-shot qubit readout using quantum capacitance, a goal that has so far been elusive.

引用

页数：6

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