Journal
PHYSICAL REVIEW APPLIED
Volume 5, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.5.034011
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Funding
- EPSRC [EP/J015067/1]
- DSTL
- European Union
- Royal Academy of Engineering
- Templeton World Charity Foundation
- EPSRC [EP/H001972/1, EP/N017188/1, EP/K004077/1, EP/J015067/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K004077/1, EP/N017188/1, EP/H001972/1, EP/J015067/1] Funding Source: researchfish
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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.
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