Cryogenic Evaluation of a Digital-to-Analog Converter for a Trapped-Ion Quantum Computer

verfasst von: Alexander Meyer, Paul Julius Ritter, Marius Neumann, Peter Toth, Sebastian Halama, Jens Repp, Matthias Brandl, Benedikt Hampel, Meinhard Schilling, Vadim Issakov
Abstract: This paper presents a Digital-to-Analog Converter (DAC) for shuttling operations in a trapped-ion quantum computer (TIQC) measured at 4.6 K.We provide an extensive analysis and comparison of measured characteristics at room temperature (RT) versus those at cryogenic temperature (CT), particularly focusing on the DAC’s static and dynamic behavior, as well as its noise performance. By making well-conceived analytical design choices, we show that the DAC’s performance at CT can match its performance at RT. This is achieved through sufficient design margins, the selection of suitable components, and the adjustment of biasing voltages. The investigated chip features a 12 bit, resistive R-2R ladder-based DAC, which also comprises an input buffer for the DAC’s reference voltage and a simplistic SPI to read the digital control words. Implemented in Infineon’s 130nm Bipolar-CMOS-DMOS (BCD) technology, the DAC consumes 1.1mW from a 1.5V power supply at RT. Its power consumption increases to around 1.5mW at CT due to necessary biasing adjustments. The DAC’s linearity, characterized by its Differential-Non-Linearity (DNL) and Integral-Non-Linearity (INL) remains almost unchanged across temperatures, aligning with its Spurious-Free Dynamic Range (SFDR). The slew-rate (SR) decreases toward CT compared to RT. While the thermal noise floor also decreases, the low-frequency noise increases at CT. Overall, this leads to a slight decrease in the DAC’s noise performance at 4.6K.
Organisationseinheit(en): Institut für Quantenoptik
Externe Organisation(en): Technische Universität Braunschweig
Infineon Technologies AG
Typ: Artikel
Journal: IEEE Transactions on Instrumentation and Measurement
Band: 74
ISSN: 0018-9456
Publikationsdatum: 19.05.2025
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Instrumentierung, Elektrotechnik und Elektronik
Elektronische Version(en): https://doi.org/10.1109/TIM.2025.3571087 (Zugang: Offen)

BibTeX

@article{c4a331162f3149e19bec3bed12bd1a3e,
title = "Cryogenic Evaluation of a Digital-to-Analog Converter for a Trapped-Ion Quantum Computer",
abstract = "This paper presents a Digital-to-Analog Converter (DAC) for shuttling operations in a trapped-ion quantum computer (TIQC) measured at 4.6 K.We provide an extensive analysis and comparison of measured characteristics at room temperature (RT) versus those at cryogenic temperature (CT), particularly focusing on the DAC{\textquoteright}s static and dynamic behavior, as well as its noise performance. By making well-conceived analytical design choices, we show that the DAC{\textquoteright}s performance at CT can match its performance at RT. This is achieved through sufficient design margins, the selection of suitable components, and the adjustment of biasing voltages. The investigated chip features a 12 bit, resistive R-2R ladder-based DAC, which also comprises an input buffer for the DAC{\textquoteright}s reference voltage and a simplistic SPI to read the digital control words. Implemented in Infineon{\textquoteright}s 130nm Bipolar-CMOS-DMOS (BCD) technology, the DAC consumes 1.1mW from a 1.5V power supply at RT. Its power consumption increases to around 1.5mW at CT due to necessary biasing adjustments. The DAC{\textquoteright}s linearity, characterized by its Differential-Non-Linearity (DNL) and Integral-Non-Linearity (INL) remains almost unchanged across temperatures, aligning with its Spurious-Free Dynamic Range (SFDR). The slew-rate (SR) decreases toward CT compared to RT. While the thermal noise floor also decreases, the low-frequency noise increases at CT. Overall, this leads to a slight decrease in the DAC{\textquoteright}s noise performance at 4.6K.",
keywords = "Cryogenic Operation, Digital-to-Analog Converter, Ion Shuttling, Trapped-Ion Quantum Computing, ion shuttling, digital-to-analog converter (DAC), trapped-ion quantum computing (QC), Cryogenic operation",
author = "Alexander Meyer and Ritter, {Paul Julius} and Marius Neumann and Peter Toth and Sebastian Halama and Jens Repp and Matthias Brandl and Benedikt Hampel and Meinhard Schilling and Vadim Issakov",
note = "Publisher Copyright: {\textcopyright} 1963-2012 IEEE.",
year = "2025",
month = may,
day = "19",
doi = "10.1109/TIM.2025.3571087",
language = "English",
volume = "74",
journal = "IEEE Transactions on Instrumentation and Measurement",
issn = "0018-9456",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
}