Real-Time Feedback Control of Charge Sensing for Quantum Dot Qubits
| Autor: | Nakajima, Takashi, Kojima, Yohei, Uehara, Yoshihiro, Noiri, Akito, Takeda, Kenta, Kobayashi, Takashi, Tarucha, Seigo |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review Applied 15, L031003 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.15.L031003 |
| Popis: | Measurement of charge configurations in few-electron quantum dots is a vital technique for spin-based quantum information processing. While fast and high-fidelity measurement is possible by using proximal quantum dot charge sensors, their operating range is limited and prone to electrical disturbances. Here we demonstrate realtime operation of a charge sensor in a feedback loop to maintain its sensitivity suitable for fast charge sensing in a Si/SiGe double quantum dot. Disturbances to the charge sensitivity, due to variation of gate voltages for operating the quantum dot and $1/f$ charge fluctuation, are compensated by a digital PID controller with the bandwidth of $\approx 100\,{\rm kHz}$. The rapid automated tuning of a charge sensor enables unobstructed charge stability diagram measurement facilitating realtime quantum dot tuning and submicrosecond single-shot spin readout without compromising the performance of a charge sensor in time-consuming experiments for quantum information processing. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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