Gigahertz Single-Electron Pumping Mediated by Parasitic States

Abstract

In quantum metrology, semiconductor single-electron pumps are used to generate accurate electric currents with the ultimate goal of implementing the emerging quantum standard of the ampere. Pumps based on electrostatically defined tunable quantum dots (QDs) have thus far shown the most promising performance in combining fast and accurate charge transfer. However, at frequencies exceeding approximately 1 GHz, the accuracy typically decreases. Recently, hybrid pumps based on QDs coupled to trap states have led to increased transfer rates due to tighter electrostatic confinement. Here, we operate a hybrid electron pump in silicon obtained by coupling a QD to multiple parasitic states, and achieve robust current quantization up to a few gigahertz. We show that the fidelity of the electron capture depends on the sequence in which the parasitic states become available for loading, resulting in distinctive frequency dependent features in the pumped current.

arXiv comment15 pages, 8 figures (including Supporting Information)

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Cited by in corpus (7)

• Evidence for universality of tunable-barrier electron pumps
• Picosecond coherent electron motion in a silicon single-electron source
• Quantum dot state initialization by control of tunneling rates
• Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG
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