1.1k citations · 2.2k across the 14 of their papers we have counts for
14 papers
Circuit simulation of readout process toward large-scale superconducting quantum circuits
Tetsufumi Tanamoto, Hiroshi Fuketa, Toyofumi Ishikawa +1
The rapid scaling of superconducting quantum computers has highlighted the impact of device-level variability on overall circuit fidelity. In particular, fabrication-induced fluctu…
Fast tunable coupling scheme of Kerr parametric oscillators based on shortcuts to adiabaticity
Shumpei Masuda, Taro Kanao, Hayato Goto +3
Kerr parametric oscillators (KPOs), which can be implemented with superconducting parametrons possessing large Kerr nonlinearity, have been attracting much attention in terms of th…
Theoretical study of reflection spectroscopy for superconducting quantum parametrons
S. Masuda, A. Yamaguchi, T. Yamaji +4
Superconducting parametrons in the single-photon Kerr regime, also called KPOs, have been attracting increasing attention in terms of their applications to quantum annealing and un…
Proposed rapid detection of nuclear spins with entanglement-enhanced sensors
Hideaki Hakoshima, Yuichiro Matsuzaki, Toyofumi Ishikawa
Recently, there have been significant developments to detect nuclear spins with an nitrogen vacancy (NV) center in diamond. However, due to the nature of the short range dipole-dip…
Controls of a superconducting quantum parametron under a strong pump field
Shumpei Masuda, Toyofumi Ishikawa, Yuichiro Matsuzaki +1
Pumped at approximately twice the natural frequency, a Josephson parametric oscillator called parametron or Kerr parametric oscillator shows self-oscillation. Quantum annealing and…
Detection of the phase shift of an alternating-current magnetic field by quantum sensing with multiple-pulse decoupling sequences
Toyofumi Ishikawa, Akio Yoshizawa, Yasunori Mawatari +2
Magnetometry utilizing a spin qubit in a solid state possesses high sensitivity. In particular, a magnetic sensor with a high spatial resolution can be achieved with the electron-s…
Influence of dynamical decoupling sequences with finite-width pulses on quantum sensing for AC magnetometry
Toyofumi Ishikawa, Akio Yoshizwa, Yasunori Mawatari +2
Dynamical decoupling sequences with multiple pulses can be considered to exhibit filter functions for the time evolution of a qubit superposition state. They contribute to the impr…
Nonclassical photon number distribution in a superconducting cavity under a squeezed drive
S. Kono, Y. Masuyama, T. Ishikawa +5
A superconducting qubit in the strong dispersive regime of a circuit quantum electrodynamics system is a powerful probe for microwave photons in a cavity mode. In this regime, a qu…
Resolving magnon number states in quantum magnonics
Dany Lachance-Quirion, Yutaka Tabuchi, Seiichiro Ishino +4
Collective excitation modes in solid state systems play a central role in circuit quantum electrodynamics, cavity optomechanics, and quantum magnonics. In the latter, quanta of col…
Strong coupling in multimode quantum electromechanics
Atsushi Noguchi, Rekishu Yamazaki, Manabu Ataka +5
Cavity electro-(opto-)mechanics allows us to access not only single isolated but also multiple mechanical modes in a massive object. Here we develop a multi-mode electromechanical…
Bidirectional conversion between microwave and light via ferromagnetic magnons
Ryusuke Hisatomi, Alto Osada, Yutaka Tabuchi +5
Coherent conversion of microwave and optical photons in the single-quantum level can significantly expand our ability to process signals in various fields. Efficient up-conversion…
Quantum magnonics: magnon meets superconducting qubit
Yutaka Tabuchi, Seiichiro Ishino, Atsushi Noguchi +4
The techniques of microwave quantum optics are applied to collective spin excitations in a macroscopic sphere of ferromagnetic insulator. We demonstrate, in the single-magnon limit…
Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
Yutaka Tabuchi, Seiichiro Ishino, Toyofumi Ishikawa +3
We demonstrate large normal-mode splitting between a magnetostatic mode (the Kittel mode) in a ferromagnetic sphere of yttrium iron garnet and a microwave cavity mode. Strong coupl…
Excitonic Aharonov-Bohm Effect in Isotopically Pure 70Ge/Si Type-II Quantum Dots
Satoru Miyamoto, Oussama Moutanabbir, Toyofumi Ishikawa +5
We report on a magneto-photoluminescence study of isotopically pure 70Ge/Si self-assembled type-II quantum dots. Oscillatory behaviors attributed to the Aharonov-Bohm effect are si…