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View article: Fault-tolerant quantum computing with a high-rate symplectic double code
Fault-tolerant quantum computing with a high-rate symplectic double code Open
High-rate and large-distance quantum codes are expected to make fault-tolerant quantum computing more efficient, but most of them lack efficient fault-tolerant encoded-state preparation methods. We propose such a fault-tolerant encoder for…
View article: Engineering propagating cat states with driven four-level systems inside a cavity
Engineering propagating cat states with driven four-level systems inside a cavity Open
We propose a method for generating optical cat states in propagating pulses based on cavity quantum electrodynamics (QED). This scheme uses multiple four-level systems (FLSs) inside an optical cavity as a light source. Time-modulating driv…
View article: High-performance conditional-driving gate for Kerr parametric oscillator qubits
High-performance conditional-driving gate for Kerr parametric oscillator qubits Open
Kerr parametric oscillators (KPOs), two-photon driven Kerr-nonlinear resonators, can stably hold coherent states with opposite-sign amplitudes and are promising devices for quantum computing. Recently, we have theoretically proposed a two-…
View article: Realization of High-Fidelity CZ Gate Based on a Double-Transmon Coupler
Realization of High-Fidelity CZ Gate Based on a Double-Transmon Coupler Open
Striving for higher gate fidelity is crucial not only for enhancing existing noisy intermediate-scale quantum devices, but also for unleashing the potential of fault-tolerant quantum computation through quantum error correction. A recently…
View article: High-performance conditional-driving gate for Kerr parametric oscillator qubits
High-performance conditional-driving gate for Kerr parametric oscillator qubits Open
Kerr parametric oscillators (KPOs), two-photon driven Kerr-nonlinear resonators, can stably hold coherent states with opposite-sign amplitudes and are promising devices for quantum computing. Recently, we have theoretically proposed a two-…
View article: High-performance fault-tolerant quantum computing with many-hypercube codes
High-performance fault-tolerant quantum computing with many-hypercube codes Open
Standard approaches to quantum error correction for fault-tolerant quantum computing are based on encoding a single logical qubit into many physical ones, resulting in asymptotically zero encoding rates and therefore huge resource overhead…
View article: High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers
High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers Open
Tunable couplers in superconducting quantum computers have enabled fast and accurate two-qubit gates, with reported high fidelities over 99% in various architectures and gate-implementation schemes. However, there are few tunable couplers …
View article: Many-hypercube codes: High-rate quantum error-correcting codes for high-performance fault-tolerant quantum computing
Many-hypercube codes: High-rate quantum error-correcting codes for high-performance fault-tolerant quantum computing Open
Standard approaches to quantum error correction for fault-tolerant quantum computing are based on encoding a single logical qubit into many physical ones, resulting in asymptotically zero encoding rates and therefore huge resource overhead…
View article: Fast elementary gates for universal quantum computation with Kerr parametric oscillator qubits
Fast elementary gates for universal quantum computation with Kerr parametric oscillator qubits Open
Kerr parametric oscillators (KPOs) can stabilize the superpositions of coherent states, which can be utilized as qubits, and are promising candidates for realizing hardware-efficient quantum computers. Although elementary gates for univers…
View article: Roadmap for unconventional computing with nanotechnology
Roadmap for unconventional computing with nanotechnology Open
In the ‘Beyond Moore’s Law’ era, with increasing edge intelligence, domain-specific computing embracing unconventional approaches will become increasingly prevalent. At the same time, adopting a variety of nanotechnologies will offer benef…
View article: High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers
High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers Open
Tunable couplers in superconducting quantum computers have enabled fast and accurate two-qubit gates, with reported high fidelities over 99% in various architectures and gate implementation schemes. However, there are few tunable couplers …
View article: Review of quantum computing and potential applications in nuclear engineering
Review of quantum computing and potential applications in nuclear engineering Open
現在のコンピュータではシミュレーションが困難なレベルの量子コンピュータの実機が現れ,最近注目を集めている。また,量子コンピュータにインスパイアされたドメイン志向コンピューティングとして,組合せ最適化専用の計算機の研究開発も近年活発である。本稿ではこれらの話題を俯瞰すべく,量子コンピュータの基礎から始め,量子ハードウェア,量子アルゴリズム,量子インスパイアード技術の最新動向を紹介する。
View article: Measurement-free fault-tolerant logical-zero-state encoding of the distance-three nine-qubit surface code in a one-dimensional qubit array
Measurement-free fault-tolerant logical-zero-state encoding of the distance-three nine-qubit surface code in a one-dimensional qubit array Open
Generation of logical zero states encoded with a quantum error-correcting code is the first step for fault-tolerant quantum computation but requires considerably large resource overheads in general. To reduce such overheads, we propose an …
View article: Fast elementary gates for universal quantum computation with Kerr parametric oscillator qubits
Fast elementary gates for universal quantum computation with Kerr parametric oscillator qubits Open
Kerr parametric oscillators (KPOs) can stabilize the superpositions of coherent states, which can be utilized as qubits, and are promising candidates for realizing hardware-efficient quantum computers. Although elementary gates for univers…
View article: Measurement-free fault-tolerant logical zero-state encoding of the distance-three nine-qubit surface code in a one-dimensional qubit array
Measurement-free fault-tolerant logical zero-state encoding of the distance-three nine-qubit surface code in a one-dimensional qubit array Open
Generation of logical zero states encoded with a quantum error-correcting code is the first step for fault-tolerant quantum computation, but requires considerably large resource overheads in general. To reduce such overheads, we propose an…
View article: Control of the $ZZ$ coupling between Kerr-cat qubits via transmon couplers
Control of the $ZZ$ coupling between Kerr-cat qubits via transmon couplers Open
Kerr-cat qubits are a promising candidate for fault-tolerant quantum computers owing to the biased nature of their errors. The $ZZ$ coupling between the qubits can be utilized for a two-qubit entangling gate, but the residual coupling call…
View article: Roadmap for Unconventional Computing with Nanotechnology
Roadmap for Unconventional Computing with Nanotechnology Open
In the "Beyond Moore's Law" era, with increasing edge intelligence, domain-specific computing embracing unconventional approaches will become increasingly prevalent. At the same time, adopting a variety of nanotechnologies will offer benef…
View article: Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study
Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study Open
Background Tensiomyography (TMG) is a non-invasive instrument for measuring mechanical muscle contraction characteristics and measuring the maximum displacement of the muscle belly in the radial direction with respect to the muscle and the…
View article: Peer Review #3 of "Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study (v0.1)"
Peer Review #3 of "Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study (v0.1)" Open
Background.Tensiomyography (TMG) is a non-invasive instrument for measuring mechanical muscle contraction characteristics and measuring the maximum displacement of the muscle belly in the radial direction with respect to the muscle and the…
View article: Peer Review #1 of "Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study (v0.1)"
Peer Review #1 of "Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study (v0.1)" Open
Background.Tensiomyography (TMG) is a non-invasive instrument for measuring mechanical muscle contraction characteristics and measuring the maximum displacement of the muscle belly in the radial direction with respect to the muscle and the…
View article: Peer Review #1 of "Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study (v0.2)"
Peer Review #1 of "Characteristics of muscle contraction of the rectus femoris using tensiomyography by sex in healthy college students: a cross-sectional study (v0.2)" Open
Background.Tensiomyography (TMG) is a non-invasive instrument for measuring mechanical muscle contraction characteristics and measuring the maximum displacement of the muscle belly in the radial direction with respect to the muscle and the…
View article: Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler
Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler Open
High-performance two-qubit gates have been reported with superconducting qubits coupled via a single-transmon coupler (STC). Most of them are implemented for qubits with a small detuning since reducing residual $ZZ$ coupling for highly det…
View article: Ising Machines—Quantum-Inspired Machines for Combinatorial Optimization—
Ising Machines—Quantum-Inspired Machines for Combinatorial Optimization— Open
本稿では，近年国内外で活発に研究開発されているイジングマシンについて述べる．イジングマシンとは，イジング問題と呼ばれる組合せ最適化問題に特化した専用計算機である．世界初の商用量子コンピュータである量子アニーラがイジングマシンの一種であり，それをGoogleとNASAが創設した量子人工知能研究所が購入したことをきっかけに，イジングマシンが注目を集めるようになった．現在では，超伝導や光といった特殊なハードウェアだけでなく，従来の半導体デジタル計算機を利用して実用性を高めたものも…
View article: Simulated bifurcation for higher-order cost functions
Simulated bifurcation for higher-order cost functions Open
High-performance Ising machines for solving combinatorial optimization problems have been developed with digital processors implementing heuristic algorithms such as simulated bifurcation (SB). Although Ising machines have been designed fo…
View article: Two-qubit gate using conditional driving for highly detuned Kerr nonlinear parametric oscillators
Two-qubit gate using conditional driving for highly detuned Kerr nonlinear parametric oscillators Open
A Kerr nonlinear parametric oscillator (KPO) is one of the promising devices used to realize qubits for universal quantum computing. The KPO can stabilize two coherent states with opposite phases, yielding a quantum superposition called a …
View article: Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits
Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits Open
Tunable couplers, which turn on and off the interaction between qubits, have emerged as a key means to achieve low error rates in superconducting quantum computers. Conventional devices using one transmon qubit exhibit unwanted residual co…
View article: Gaussian-wave-packet model for single-photon generation based on cavity quantum electrodynamics under adiabatic and nonadiabatic conditions
Gaussian-wave-packet model for single-photon generation based on cavity quantum electrodynamics under adiabatic and nonadiabatic conditions Open
For single-photon generation based on cavity quantum electrodynamics, we investigate a practical model assuming a Gaussian wave packet. This model makes it possible to comprehensively analyze the temporal dynamics of an atom-cavity system …
View article: Quantum Gate for a Kerr Nonlinear Parametric Oscillator Using Effective Excited States
Quantum Gate for a Kerr Nonlinear Parametric Oscillator Using Effective Excited States Open
A Kerr nonlinear parametric oscillator (KPO) can stabilize a quantum\nsuperposition of two coherent states with opposite phases, which can be used as\na qubit. In a universal gate set for quantum computation with KPOs, an $R_x$\ngate, whic…
View article: Simulated bifurcation assisted by thermal fluctuation
Simulated bifurcation assisted by thermal fluctuation Open
View article: Two-qubit gate using conditional driving for highly detuned Kerr-nonlinear parametric oscillators
Two-qubit gate using conditional driving for highly detuned Kerr-nonlinear parametric oscillators Open
A Kerr-nonlinear parametric oscillator (KPO) is one of the promising devices to realize qubits for universal quantum computing. The KPO can stabilize two coherent states with opposite phases, yielding a quantum superposition called a Schrö…