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
收藏
页数:6
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