22 citations · 49 across the 9 of their papers we have counts for
9 papers
Microwave Output Stabilization of a Qubit Controller via Device-Level Temperature Control
Yoshinori Kurimoto, Dongjun Lee, Koichiro Ban +8
We present the design and performance of QuEL-1 SE, which is a multichannel qubit controller developed for superconducting qubits. The system incorporates the active thermal stabil…
Trapping an Atomic Ion using Time-Division Multiplexed Digital-to-Analog Converters
Ryutaro Ohira, Masanari Miyamoto, Shinichi Morisaka +4
Independent control of numerous electrodes in quantum charge-coupled device architectures presents a significant challenge for wiring and hardware scalability. To address this issu…
Multiplexed Control at Scale for Electrode Arrays in Trapped-Ion Quantum Processors
Ryutaro Ohira, Shinichi Morisaka, Ippei Nakamura +2
The scaling up of trapped-ion quantum processors based on the quantum charge-coupled device (QCCD) architecture is difficult owing to the extensive electronics and high-density wir…
Coherent control of a local phonon in trapped ions using dynamical decoupling
Ryutaro Ohira, Shota Kume, Kenji Toyoda
In this paper, we present a dynamical decoupling (DD) technique to coherently control the dynamics of a single local phonon in trapped ions. A 2 rotation at a motional sideband…
Evaluating states in trapped ions with local correlation between internal and motional degrees of freedom
Silpa Muralidharan, Ryutaro Ohira, Shota Kume +1
We propose and demonstrate a scalable scheme for the simultaneous determination of internal and motional states in trapped ions with single-site resolution. The scheme is applied t…
Polariton blockade in the Jaynes-Cummings-Hubbard model with trapped ions
Ryutaro Ohira, Shota Kume, Hiroki Takahashi +1
We have experimentally observed the dynamics of a single polariton and two polaritons in a two-ion chain. By driving two trapped ions at a motional blue-sideband transition, we rea…
Blockade of phonon hopping in trapped ions in the presence of multiple local phonons
Ryutaro Ohira, Shota Kume, Kyoichi Takayama +3
Driving an ion at a motional sideband transition induces the Jaynes--Cummings (JC) interaction. This JC interaction creates an anharmonic ladder of JC eigenstates, resulting in the…
Phonon-number-resolving Detection of Multiple Local Phonon Modes in Trapped Ions
Ryutaro Ohira, Takashi Mukaiyama, Kenji Toyoda
We propose and demonstrate phonon-number-resolving detection of the multiple local phonon modes in a trapped-ion chain. To mitigate the effect of phonon hopping during the detectio…
Breaking rotational symmetry in a trapped-ion quantum tunneling rotor
Ryutaro Ohira, Takashi Mukaiyama, Kenji Toyoda
A trapped-ion quantum tunneling rotor (QTR) is in a quantum superposition of two different Wigner crystal orientations. In a QTR system, quantum tunneling drives the coherent trans…