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

共 34 条

[1] Radio-frequency single-electron transistor as readout device for qubits: Charge sensitivity and backaction
Aassime, A
Johansson, G
Wendin, G
Schoelkopf, RJ
Delsing, P
[J]. PHYSICAL REVIEW LETTERS, 2001, 86 (15) : 3376 - 3379
[2] Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot
Barthel, C.
Kjaergaard, M.
Medford, J.
Stopa, M.
Marcus, C. M.
Hanson, M. P.
Gossard, A. C.
[J]. PHYSICAL REVIEW B, 2010, 81 (16):
[3] Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
Barthel, C.
Reilly, D. J.
Marcus, C. M.
Hanson, M. P.
Gossard, A. C.
[J]. PHYSICAL REVIEW LETTERS, 2009, 103 (16)
[4] Shot noise in mesoscopic conductors
Blanter, YM
Büttiker, M
[J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2000, 336 (1-2): : 1 - 166
[5] An ultrasensitive radio-frequency single-electron transistor working up to 4.2 K
Brenning, Henrik
Kafanov, Sergey
Duty, Tim
Kubatkin, Sergey
Delsing, Per
[J]. JOURNAL OF APPLIED PHYSICS, 2006, 100 (11)
[6] MESOSCOPIC CAPACITORS
BUTTIKER, M
THOMAS, H
PRETRE, A
[J]. PHYSICS LETTERS A, 1993, 180 (4-5) : 364 - 369
[7] Single shot charge detection using a radio-frequency quantum point contact
Cassidy, M. C.
Dzurak, A. S.
Clark, R. G.
Petersson, K. D.
Farrer, I.
Ritchie, D. A.
Smith, C. G.
[J]. APPLIED PHYSICS LETTERS, 2007, 91 (22)
[8] Measuring the Complex Admittance of a Carbon Nanotube Double Quantum Dot
Chorley, S. J.
Wabnig, J.
Penfold-Fitch, Z. V.
Petersson, K. D.
Frake, J.
Smith, C. G.
Buitelaar, M. R.
[J]. PHYSICAL REVIEW LETTERS, 2012, 108 (03)
[9] Churchill H. O. H., 2012, THESIS HARVARD U
[10] Dispersive Readout of a Few-Electron Double Quantum Dot with Fast rf Gate Sensors
Colless, J. I.
Mahoney, A. C.
Hornibrook, J. M.
Doherty, A. C.
Lu, H.
Gossard, A. C.
Reilly, D. J.
[J]. PHYSICAL REVIEW LETTERS, 2013, 110 (04)

← 1 2 3 4 →