657 citations · 2.4k across the 32 of their papers we have counts for
32 papers
Geometric dependence of critical-current variation in Al/AlO/Al Josephson junctions: a model-based analysis
K. Kakuyanagi, N. Teran, H. Toida +1
Achieving uniform critical current across Josephson junctions is essential for the large-scale integration of superconducting quantum circuits. In this work, we statistically analy…
Identifying impurities in a silicon substrate by using a superconducting flux qubit
Hiraku Toida, Kosuke Kakuyanagi, Leonid V. Abdurakhimov +3
A bismuth-doped silicon substrate was analyzed by using a magnetometer based on a superconducting flux qubit. The temperature dependence of the magnetization indicates that the sil…
Extremely large Lamb shift in a deep-strongly coupled circuit QED system with a multimode resonator
Ziqiao Ao, Sahel Ashhab, Fumiki Yoshihara +5
We report experimental and theoretical results on the extremely large Lamb shift in a multimode circuit quantum electrodynamics (QED) system in the deep-strong coupling (DSC) regim…
Magnetometry of neurons using a superconducting qubit
Hiraku Toida, Koji Sakai, Tetsuhiko F. Teshima +5
We demonstrate magnetometry of cultured neurons on a polymeric film using a superconducting flux qubit that works as a sensitive magnetometer in a microscale area. The neurons are…
Identification of different types of high-frequency defects in superconducting qubits
Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida +3
Parasitic two-level-system (TLS) defects are one of the major factors limiting the coherence times of superconducting qubits. Although there has been significant progress in charac…
Driven-state relaxation of a coupled qubit-defect system in spin-locking measurements
Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida +3
It is widely known that spin-locking noise-spectroscopy is a powerful technique for the characterization of low-frequency noise mechanisms in superconducting qubits. Here we show t…