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  • Letter
  • Open Access

Real-Time Feedback Control of Charge Sensing for Quantum Dot Qubits

Takashi Nakajima1,*, Yohei Kojima2, Yoshihiro Uehara3, Akito Noiri1, Kenta Takeda1, Takashi Kobayashi1, and Seigo Tarucha1,3,†

  • 1Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
  • 2Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 3Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

  • *nakajima.physics@icloud.com
  • †tarucha@riken.jp
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Phys. Rev. Applied 15, L031003 – Published 26 March, 2021

DOI: https://doi.org/10.1103/PhysRevApplied.15.L031003

Abstract

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 real-time operation of a charge sensor in a feedback loop to maintain its sensitivity suitable for fast charge sensing in a Si/Si0.7Ge0.3 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 proportional-integral-differential controller with the bandwidth of approximately equal to 100kHz. The rapid automated tuning of a charge sensor enables unobstructed charge-stability-diagram measurement facilitating real-time 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.

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Phys. Rev. Applied 15, L031003– Published 26 March, 2021
  • Received 31 December 2020
  • Accepted 2 March 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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