89 citations · 284 across the 6 of their papers we have counts for
6 papers
Enhanced coherence of all-nitride superconducting qubits epitaxially grown on silicon substrate
Sunmi Kim, Hirotaka Terai, Taro Yamashita +6
Improving the coherence of superconducting qubits is a fundamental step towards the realization of fault-tolerant quantum computation. However, coherence times of quantum circuits…
Fabrication of Deep-Sub-Micrometer NbN/AlN/NbN Epitaxial Junctions on a Si Substrate
Wei Qiu, Hirotaka Terai
We have developed a novel fabrication process for ultra-small, full-epitaxial NbN Josephson junctions on a silicon (Si) substrate. A full-epitaxial NbN/AlN/NbN tri-layer was grown…
Observation of three-state dressed states in circuit quantum electrodynamics
K. Koshino, H. Terai, K. Inomata +4
We have investigated the microwave response of a transmon qubit coupled directly to a transmission line. In a transmon qubit, owing to its weak anharmonicity, a single driving fiel…
Temperature Dependent Performances of Superconducting Nanowire Single-Photon Detectors in an Ultralow-Temperature Region
Taro Yamashita, Shigehito Miki, Wei Qiu +3
We present the performances of a superconducting nanowire single-photon detector (SNSPD) in an ultralow-temperature region from 16 mK to 4 K. The system detection efficiency of the…
Measurement of Dissipation of a Three-Level rf SQUID Qubit
Shao-Xiong Li, Wei Qiu, Zhongyuan Zhou +4
The dissipation-induced relaxation (T_1) time of a macroscopic quantum system - a \{lambda}-type three-level rf SQUID flux qubit weakly coupled to control and readout circuitry (CR…
Crossover from Kramers to phase-diffusion switching in hysteretic DC-SQUIDs
J. Mannik, S. Li, W. Qiu +4
We have measured and propose a model for switching rates in hysteretic DC-SQUID in the regime where phase diffusion processes start to occur. We show that the switching rates in th…