78 citations · 370 across the 15 of their papers we have counts for
15 papers
Study of decoherence in radial local phonon hopping within trapped-ion string
Yu-Xuan Chen, Takumi Yuri, Kenji Toyoda
We systematically investigate local phonon hopping in the radial direction of a linear trapped-ion string. We measure the decay of hopping as a function of key trap parameters and…
Site-dependent control of polaritons in the Jaynes Cummings Hubbard model with trapped ions
Silpa Muralidharan, Kenji Toyoda
We demonstrate the site-dependent control of polaritons in the Jaynes Cummings Hubbard (JCH) model with trapped ions. In a linear ion crystal under illumination by optical beams ne…
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…
Quantum walks of a phonon in trapped ions
Masaya Tamura, Takashi Mukaiyama, Kenji Toyoda
Propagation and interference of quantum-mechanical particles comprise an important part of elementary processes in quantum physics, and their essence can be modeled using a quantum…
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…
Aharonov-Bohm effect in the tunnelling of a quantum rotor in a linear Paul trap
Atshushi Noguchi, Yutaka Shikano, Kenji Toyoda +1
Quantum tunnelling is a common fundamental quantum-mechanical phenomenon that originates from the wave-like characteristics of quantum particles. Although the quantum-tunnelling ef…
Experimental realization of a quantum phase transition of polaritonic excitations
Kenji Toyoda, Yuta Matsuno, Atsushi Noguchi +2
We report an experimental realization of the Jaynes-Cummings-Hubbard (JCH) model using the internal and radial phonon states of two trapped ions. An adiabatic transfer correspondin…
Realization of holonomic single-qubit operations
K. Toyoda, K. Uchida, A. Noguchi +2
Universal single-qubit operations based on purely geometric phase factors in adiabatic processes are demonstrated by utilizing a four-level system in a trapped single Ca…
Generation of Dicke States with Phonon-Mediated Multi-level Stimulated Raman Adiabatic Passage
Atsushi Noguchi, Kenji Toyoda, Shinji Urabe
We generate half-excited symmetric Dicke states of two and four ions. We use multi-level stimulated Raman adiabatic passage (STIRAP) whose intermediate states are phonon Fock state…
Generation of a spin-squeezed state with trapped ions using a dressing field
Atsushi Noguchi, Kenji Toyoda, Shinji Urabe
We propose a method for generating a spin-squeezed state that is a symmetric Dicke state, with trapped ions using only global access. The eigenstates of the ions under a strong dre…
Generation of a decoherence-free entangled state using a radio frequency dressed state
Atsushi Noguchi, Shinsuke Haze, Kenji Toyoda +1
We propose the generation of entangled states with trapped calcium ions using a combination of an rf dressed state and a spin dependent force. Using this method, a decoherence-free…