5 papers
ZZ-Free bSWAP Gates under Strong Driving in Far-Detuned Fixed-Frequency Transmons
Akinori Machino, Kazuhisa Ogawa, Yuto Ikegai +9
Far-detuned frequency allocations in fixed-frequency superconducting processors mitigate spectral crowding but constrain cross-resonance interactions at practical drive amplitudes.…
QuBE/Qubex: an integrated hardware-software system for superconducting qubit experiments with broadband control
Akinori Machino, Kazuhisa Ogawa, Takefumi Miyoshi +21
Achieving high-fidelity operation in large-scale superconducting qubit systems requires not only control hardware with broad frequency coverage, low crosstalk, and tight synchroniz…
High-yield integration design of fixed-frequency superconducting qubit systems using siZZle-CZ gates
Kazuhisa Ogawa, Yutaka Tabuchi, Makoto Negoro
Fixed-frequency transmon qubits, characterized by simple architectures and long coherence times, are promising platforms for large-scale quantum computing. However, the rapidly inc…
Microwave Output Stabilization of a Qubit Controller via Device-Level Temperature Control
Yoshinori Kurimoto, Dongjun Lee, Koichiro Ban +8
We present the design and performance of QuEL-1 SE, which is a multichannel qubit controller developed for superconducting qubits. The system incorporates the active thermal stabil…
SPulseGen: Succinct pulse generator architecture maximizing gate fidelity for superconducting quantum computers
Ryosuke Matsuo, Kazuhisa Ogawa, Hidehisa Shiomi +6
This paper proposes a cost-effective architecture for an RF pulse generator for superconducting qubits. Most existing works use arbitrary waveform generators (AWGs) that require bo…