A high speed radio-frequency quantum point contact charge detector for time resolved readout applications of spin qubits

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DOIResolve DOI: http://doi.org/10.1016/j.physe.2009.11.108
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TypeArticle
Journal titlePhysica E
Volume42
Pages813816; # of pages: 4
SubjectQuantum dot, Readout, Radio-frequency quantum point contact
AbstractIn this paper,we give details related to the implementation of a rf-QPC charge detector coupled to a GaAs/AlGaAs triple dot. Each component of the readout circuit is discussed with emphasis on the isolator. We use a10 K noise temperature HEMT amplifier in the readout and determine that the attenuation of amplifier noise that the isolator provides is not significant. A base electron temperature of 100mK is reached independent of the existence of the isolator in the readout circuit. We also discuss the use of normal metal and superconducting resonant circuits. Using the superconducting resonant circuit, we detect charge motion in the device and determine that the bandwidth of the readout is at least 1 MHz with a sensitivity of 1:46 x10-4e/√Hz .
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number17379811
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Record identifierc9c1faff-7e7c-4156-8290-cfb37c11c4dc
Record created2011-03-23
Record modified2016-05-09
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