657 citations · 1.2k across the 14 of their papers we have counts for
14 papers
Controlling qubit-oscillator systems using linear parameter sweeps
Sahel Ashhab, Tomoko Fuse, Fumiki Yoshihara +2
We investigate the dynamics of a qubit-oscillator system under the influence of a linear sweep of system parameters. We consider two main cases. In the first case, we consider swee…
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…
Speed limits for two-qubit gates with weakly anharmonic qubits
Sahel Ashhab, Fumiki Yoshihara, Tomoko Fuse +3
We consider the implementation of two-qubit gates when the physical systems used to realize the qubits possess additional quantum states in the accessible energy range. We use opti…
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…
Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong-coupling regime
Fumiki Yoshihara, Sahel Ashhab, Tomoko Fuse +2
We derive the Hamiltonian of a superconducting circuit that comprises a single-Josephson-junction flux qubit inductively coupled to an LC oscillator, and we compare the derived cir…
Nonclassicality of open circuit QED systems in the deep-strong coupling regime
Tomohiro Shitara, Motoaki Bamba, Fumiki Yoshihara +4
We investigate theoretically how the ground state of a qubit-resonator system in the deep-strong coupling (DSC) regime is affected by the coupling to an environment. We employ as a…