38 citations · 74 across the 15 of their papers we have counts for
15 papers
Adaptive Window Decoding based on Spatiotemporal Complementary Gap
Moeto Mishima, Riki Toshio, Kaito Kishi +4
Real-time decoding plays a crucial role in practical fault-tolerant quantum computing. Window decoding, in which the decoding problem is divided into windows, is a promising approa…
Enabling Chemically Accurate Quantum Phase Estimation in the Early Fault-Tolerant Regime
Shota Kanasugi, Riki Toshio, Kazunori Maruyama +1
Quantum simulation of molecular electronic structure is one of the most promising applications of quantum computing. However, achieving chemically accurate predictions for strongly…
STAR-Magic Mutation: Even More Efficient Analog Rotation Gates for Early Fault-Tolerant Quantum Computer
Riki Toshio, Shota Kanasugi, Jun Fujisaki +3
We introduce STAR-magic mutation, an efficient protocol for implementing logical rotation gates on early fault-tolerant quantum computers. This protocol judiciously combines two of…
Even More Efficient Soft-Output Decoding with Extra-Cluster Growth and Early Stopping
Kaito Kishi, Riki Toshio, Jun Fujisaki +3
In fault-tolerant quantum computing, soft outputs from real-time decoders play a crucial role in improving decoding accuracy, post-selecting magic states, and accelerating lattice…
Decoder Switching: Breaking the Speed-Accuracy Tradeoff in Real-Time Quantum Error Correction
Riki Toshio, Kaito Kishi, Jun Fujisaki +3
The realization of fault-tolerant quantum computers hinges on the construction of high-speed, high-accuracy, real-time decoding systems. The persistent challenge lies in the fundam…
Runtime reduction in lattice surgery utilizing time-like soft information
Yutaro Akahoshi, Riki Toshio, Jun Fujisaki +3
Runtime optimization of the quantum computing within a given computational resource is important to achieve practical quantum advantage. In this paper, we propose a runtime reducti…
Efficient magic state cultivation with lattice surgery
Yutaka Hirano, Riki Toshio, Tomohiro Itogawa +1
Magic state distillation plays a crucial role in fault-tolerant quantum computation and represents a major bottleneck. In contrast to traditional logical-level distillation, physic…
Practical quantum advantage on partially fault-tolerant quantum computer
Riki Toshio, Yutaro Akahoshi, Jun Fujisaki +3
Achieving quantum speedups in practical tasks remains challenging for current noisy intermediate-scale quantum (NISQ) devices. These devices always encounter significant obstacles…
Compilation of Trotter-Based Time Evolution for Partially Fault-Tolerant Quantum Computing Architecture
Yutaro Akahoshi, Riki Toshio, Jun Fujisaki +3
Achieving practical quantum speedup with limited resources is a crucial challenge in both academic and industrial communities. To address this, a partially fault-tolerant quantum c…
Plasmonic quantum nonlinear Hall effect in noncentrosymmetric 2D materials
Riki Toshio, Norio Kawakami
We investigate an interplay between quantum geometrical effects and surface plasmons through surface plasmonic structures, based on an electron hydrodynamic theory. First we demons…
Path integral approach to universal dynamics of reservoir computers
Junichi Haruna, Riki Toshio, Naoto Nakano
In this work, we give a characterization of the reservoir computer (RC) by the network structure, especially the probability distribution of random coupling constants. First, based…
Nonreciprocal electron hydrodynamics under magnetic fields: applications to nonreciprocal surface magnetoplasmons
Ryotaro Sano, Riki Toshio, Norio Kawakami
Recent experiments have elucidated that novel nonequilibrium states inherent in the so-called hydrodynamic regime are realized in ultrapure metals with sufficiently strong momentum…
Vorticity-induced anomalous Hall effect in electron fluid
Hiroshi Funaki, Riki Toshio, Gen Tatara
We develop a hydrodynamic theory for an electron system exhibiting the anomalous Hall effect, and show that an additional anomalous Hall effect is induced by a vorticity generated…
Anomalous Hydrodynamic Transport in Interacting Noncentrosymmetric Metals
Riki Toshio, Kazuaki Takasan, Norio Kawakami
In highly conductive metals with sufficiently strong momentum-conserving scattering, the electron momentum is regarded as a long-lived quantity, whose dynamics is described by an e…
Nonlocal optical responses of ultrapure metals in the hydrodynamic regime
Riki Toshio, Kazuaki Takasan, Norio Kawakami
Our conventional understanding of optical responses in metals has been based on the Drude theory. In recent years, however, it has become possible to prepare ultrapure metallic sam…