A Feedback Control Method to Maintain the Amplitude of the RF Signal Applied to Ion Traps
| Autor: | Taehyun Kim, Dong-il Dan Cho, Seungwoo Yoo, Hyunseok Oh, Yunjae Park |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Automatic control
Frequency drift PID controller 01 natural sciences Signal lcsh:Technology 010305 fluids & plasmas lcsh:Chemistry Control theory 0103 physical sciences PI controller General Materials Science 010306 general physics Instrumentation lcsh:QH301-705.5 FPGA Fluid Flow and Transfer Processes Physics lcsh:T Process Chemistry and Technology General Engineering lag compensator helical resonator lcsh:QC1-999 Computer Science Applications Amplitude lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 feedback controller Radio frequency Lead–lag compensator lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 11, Iss 837, p 837 (2021) Applied Sciences Volume 11 Issue 2 |
| ISSN: | 2076-3417 |
| Popis: | For high-fidelity quantum operations in ion traps, it is important to maintain the secular frequency of the trapped ions at a constant value. The radial secular frequency is proportional to the amplitude of the radio frequency (RF) signal applied to ion traps. Owing to the changes in the ambient temperature of a helical resonator and the minute vibration of the optical table, the amplitude can vary. Recently, a method for reducing the fluctuation in the RF signal amplitude, using a commercial universal proportional-plus-integral (PI) controller, has been introduced, which, in turn, reduces the secular frequency drift of the trapped ions. The method improves the capability to maintain the secular frequency at a constant value. However, the structure of the controller is fixed thus, the control method cannot be changed to suit different experimental conditions, and the different feedback configuration cannot be implemented to increase the resolution. In this paper, we develop a field-programmable gate array (FPGA)-based feedback controller that allows the implementation of various automatic control methods and feedback configurations. In our experiments, the fluctuation in the amplitude of the RF signal was 1.806% using a commercial universal PI controller. The fluctuation was reduced to 0.099% using the developed FPGA-based PI controller, and to 0.102% using the developed FPGA-based lag compensator. By employing the developed FPGA control method, many other automating control methods can be applied to achieve a stable and high-performance control of the secular frequency. |
| Databáze: | OpenAIRE |
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