41 citations · 96 across the 12 of their papers we have counts for
12 papers
Instantaneous-Frame Theory of Strongly Driven Parametric Gates
Kentaro Kubo, Shinichi Inoue, Jushin Tei +3
Parametric two-qubit gates using tunable couplers are a promising approach to scalable superconducting quantum processors. However, conventional theories formulated in the idle eig…
Parametrically Driven iSWAP Gate Using a Capacitively Shunted Double-Transmon Coupler at the Zero-Flux Sweet Spot
Shinichi Inoue, Rui Li, Kentaro Kubo +3
A double-transmon coupler (DTC) enables a fast, high-fidelity CZ gate between two highly detuned, fixed-frequency transmon qubits. Moreover, a recently proposed capacitively shunte…
Quantum chemistry based on classical mechanics inspired by simulated bifurcation
Fumihiko Aiga, Hayato Goto
Accurate quantum chemical calculations are critical for understanding molecular properties, yet their computational cost remains a major challenge. Full Configuration Interaction (…
Training Energy-Based Models with Non-MCMC Samplers and Efficient Temperature Estimation
Kentaro Kubo, Hayato Goto
Efficient sampling from Boltzmann distributions over discrete variables is a fundamental operation in a wide range of applications. While fast non-MCMC samplers have recently emerg…
Single-shot conditional displacement gate between a trapped atom and traveling light
Seigo Kikura, Hayato Goto, Fumiya Hanamura +1
We propose a single-shot conditional displacement gate between a trapped atom as the control qubit and a traveling light pulse as the target oscillator, mediated by an optical cavi…
Capacitively Shunted Double-Transmon Coupler Realizing Bias-Free Idling and High-Fidelity CZ Gate
Rui Li, Kentaro Kubo, Yinghao Ho +4
A high-fidelity CZ gate utilizing a double-transmon coupler (DTC) has recently been demonstrated as a building block for superconducting quantum processors. Like many other kinds o…
Engineering propagating cat states with driving-assisted cavity QED
Seigo Kikura, Hayato Goto, Takao Aoki
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 (4LSs) insid…
High-performance conditional-driving gate for Kerr parametric oscillator qubits
Hiroomi Chono, Hayato Goto
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…
Many-hypercube codes: High-rate quantum error-correcting codes for high-performance fault-tolerant quantum computing
Hayato Goto
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 asymptotical…
Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
Rui Li, Kentaro Kubo, Yinghao Ho +3
Striving for higher gate fidelity is crucial not only for enhancing existing noisy intermediate-scale quantum (NISQ) devices but also for unleashing the potential of fault-tolerant…
High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers
Kentaro Kubo, Yinghao Ho, Hayato Goto
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 imple…
Gaussian-wavepacket-model for single-photon generation based on cavity QED in the adiabatic and nonadiabatic conditions
Takeru Utsugi, Akihisa Goban, Yuuki Tokunaga +2
For single-photon generation based on cavity quantum electrodynamics, we investigate a practical model assuming a Gaussian wavepacket. This model makes it possible to comprehensive…