32 citations · 119 across the 15 of their papers we have counts for
15 papers
Helium-Gas-Cooled Cryogenic Current Comparator Integrated with a Quantum Resistance Standard
Yuma Okazaki, Takehiko Oe, Nobu-Hisa Kaneko
We report a cryogen-free cryogenic current comparator (CCC) system for precision resistance measurements. A helium-gas chamber was developed and installed on the 4 K stage of a cry…
Generation of a single-cycle surface acoustic wave pulse on LiNbO for application to thin film materials
Koji Fujiwara, Shunsuke Ota, Tetsuo Kodera +5
Surface acoustic wave (SAW) technology has been explored in thin-film materials to discover fundamental phenomena and to investigate their physical properties. It is used to excite…
Eigenstate control of plasmon wavepackets with electron-channel blockade
Shintaro Takada, Giorgos Georgiou, Junliang Wang +8
Coherent manipulation of plasmon wavepackets in solid-state systems is crucial for advancing nanoscale electronic devices, offering a unique platform for quantum information proces…
Probing instantaneous quantum circuit refrigeration in the quantum regime
Shuji Nakamura, Teruaki Yoshioka, Sergei Lemziakov +8
Recent advancements in circuit quantum electrodynamics have enabled precise manipulation and detection of the single energy quantum in quantum systems. A quantum circuit refrigerat…
Suppression of Electromagnetic Crosstalk by Differential Excitation for SAW Generation
Shunsuke Ota, Yuma Okazaki, Shuji Nakamura +6
Surface acoustic waves (SAWs) hold a vast potential in various fields such as spintronics, quantum acoustics, and electron-quantum optics, but an electromagnetic wave emanating fro…
On-Demand Single-Electron Source via Single-Cycle Acoustic Pulses
Shunsuke Ota, Junliang Wang, Hermann Edlbauer +10
Surface acoustic waves (SAWs) are a reliable solution to transport single electrons with precision in piezoelectric semiconductor devices. Recently, highly efficient single-electro…
Active Initialization Experiment of Superconducting Qubit Using Quantum-circuit Refrigerator
Teruaki Yoshioka, Hiroto Mukai, Akiyoshi Tomonaga +5
The initialization of superconducting qubits is one of the essential techniques for the realization of quantum computation. In previous research, initialization above 99\% fidelity…
Generation of a single-cycle acoustic pulse: a scalable solution for transport in single-electron circuits
Junliang Wang, Shunsuke Ota, Hermann Edlbauer +13
The synthesis of single-cycle, compressed optical and microwave pulses sparked novel areas of fundamental research. In the field of acoustics, however, such a generation has not be…
Parity-dependent shot noise and spin-flip relaxation process in a hybrid superconductor-nanowire quantum dot
Keiko Takase, Yasuhiro Utsumi, Yamato Ashikawa +4
We report shot noise measurements for a quantum dot formed in an InAs nanowire suspended between superconducting electrodes. We find a clear alternation for the shot noise value in…
In-flight distribution of an electron within a surface acoustic wave
Hermann Edlbauer, Junliang Wang, Shunsuke Ota +13
Surface acoustic waves (SAW) have large potential to realize quantum-optics-like experiments with single flying electrons employing their spin or charge degree of freedom. For such…
Heat-Driven Electron-Motion in a Nanoscale Electronic Circuit
Shintaro Takada, Giorgos Georgiou, Everton Arrighi +8
We study the interaction between two closely spaced but electrically isolated quasi-one-dimensional electrical wires by a drag experiment. In this work we experimentally demonstrat…
Interplay of the inverse proximity effect and magnetic field in out-of-equilibrium single-electron devices
Shuji Nakamura, Yuri A. Pashkin, Mathieu Taupin +11
The magnetic field is shown to affect significantly non-equilibrium quasiparticle (QP) distributions under conditions of inverse proximity effect on the remarkable example of a sin…
Design and Analysis on a Cryogenic Current Amplifier with a Superconducting Microwave Resonator
Yuma Okazaki, Nobu-hisa Kaneko
We propose a new type of cryogenic current amplifiers, in which low-frequency power spectrum of current can be measured through a measurement of microwave response of a superconduc…
Shot noise spectroscopy on a semiconductor quantum dot in the elastic and inelastic cotunneling regimes
Yuma Okazaki, Satoshi Sasaki, Koji Muraki
We report shot noise spectroscopy on a semiconductor quantum dot in a cotunneling regime. The DC conductance measurements show clear signatures of both elastic and inelastic cotunn…
Spin-orbital Kondo effect in a parallel double quantum dot
Yuma Okazaki, Satoshi Sasaki, Koji Muraki
Transport properties of the two-orbital Kondo effect involving both spin and orbital (pseudospin) degrees of freedom were examined in a parallel double quantum dot with a sufficien…