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Scalable Parallel Single-Electron Pumps in Silicon with Split-Source Control in the Nanoampere Regime
Gento Yamahata1, Takase Shimizu1, Katsuhiko Nishiguchi1
1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
Nano Letters
|June 11, 2025
Summary
Parallelizing single-electron pumps achieves nanoampere currents for quantum standards. This method optimizes operating conditions, enabling higher accuracy in small-current measurements and quantum metrology.
Area of Science:
- Quantum electronics
- Metrology
Background:
- Single-electron pumps are crucial for quantum current standards, requiring nanoampere-level currents for ultrahigh accuracy (below 0.1 ppm).
- Current parallelization methods face challenges in optimizing operating conditions to reach these target current levels.
Purpose of the Study:
- To develop a scalable and easily implementable parallelization method for single-electron pumps.
- To achieve nanoampere-level currents necessary for advanced quantum metrology and small-current measurements.
Main Methods:
- Proposed a parallelization technique using tunable-barrier single-electron pumps with split source electrodes.
- Tuned source voltages to synchronize and operate multiple pumps in parallel.
Main Results:
- Successfully parallelized four single-electron pumps operating at 200 MHz.
- Demonstrated a current plateau exceeding 2 nA using three pumps at 2.1 GHz.
Conclusions:
- The developed parallelization technique is widely applicable and facilitates the advancement of high-accuracy quantum current standards.
- This method overcomes previous limitations in achieving high currents with parallel pumps.
