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Sensitive radio-frequency measurements of a quantum dot by tuning to perfect impedance matching

Abstract:

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/√Hz is achieved at a maximum source-drain bias of 170-μV rootmean-square and with a bandwidth of 18 MHz. Coulomb blockade in a quantum-dot is measured in...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.1103/PhysRevApplied.5.034011

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Institution:
University of Oxford
Department:
Oxford, MPLS, Materials
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Materials
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Materials
Mavalankar, A More by this author
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Materials
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Defence Science and Technology Laboratory More from this funder
European Union More from this funder
Royal Academy of Engineering More from this funder
Publisher:
American Physical Society Publisher's website
Journal:
Physical Review Applied Journal website
Volume:
5
Pages:
034011
Publication date:
2016-03-05
DOI:
ISSN:
2331-7019
URN:
uuid:650977d2-aa5d-465d-b60b-c6d906a5c804
Source identifiers:
612122
Local pid:
pubs:612122

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