A 1-Gb/s DDFS-based Baseband FDMA 8-Qubit Controller

Su-Hyeon Kim; Hyunyoung Yoo; Guhyeon Lee; Yeonsu Kim; In-Kwon Jang; Jae-Yun Park; Jusung Kim; Jae-Won Nam

Su-Hyeon Kim Seoul National University of Science and Technology
Hyunyoung Yoo Seoul National University of Science and Technology
Guhyeon Lee Seoul National University of Science and Technology
Yeonsu Kim Seoul National University of Science and Technology
In-Kwon Jang Seoul National University of Science and Technology
Jae-Yun Park Agency of Defense Development
Jusung Kim Ewha Womans University
Jae-Won Nam Seoul National University of Science and Technology

Keywords: Direct digital frequency synthesizer (DDFS), frequency-division multiple access, quantum computing, qubit controller

Abstract

We propose a direct digital frequency synthesizer (DDFS) based baseband multi-qubit controller with integrated pulse shaping and digital-to-analog converter (DAC). It supports eight multi-qubit control and four pulse shapes operating at 1 GHz clock speed. The digital baseband waveform generator offers programmable frequency, phase, amplitude, and pulse envelope. Pulse shaping demonstrates significant sidelobe suppression, leading to reduced adjacent channel interference. Clock gating is applied, resulting in a 9.46 % reduction in power consumption for single qubit control. The proposed baseband controller is implemented in 65 nm low-power (LP) CMOS process and achieves 62.13 dB of spurious-free dynamic range (SFDR) at the single frequency output signal. The total active area of the chip is 4 mm2.