208 citations · 2.2k across the 116 of their papers we have counts for
116 papers
Scaling-Enhanced Rapid Readout of a Qubit Ensemble Assisted by High-Frequency Detector Modes
Hiroki Nakabayashi, Yuichiro Matsuzaki
Quantum measurements of large qubit ensembles are often performed indirectly by coupling the ensemble to a detector and subsequently measuring the detector. Despite the importance…
Spin amplification in realistic systems
Ivan Iakoupov, Victor M. Bastidas, Yuichiro Matsuzaki +2
Spin amplification is the process that ideally increases the number of excited spins when one of them is excited initially. We show that by applying optimal control techniques to d…
Localized Virtual Purification
Hideaki Hakoshima, Suguru Endo, Kaoru Yamamoto +2
Analog and digital quantum simulators can efficiently simulate quantum many-body systems that appear in natural phenomena. However, experimental limitations of near-term devices st…
Demonstration of the excited-state search on the D-wave quantum annealer
Takashi Imoto, Yuki Susa, Ryoji Miyazaki +2
Quantum annealing is a way to prepare an eigenstate of the problem Hamiltonian. Starting from an eigenstate of a trivial Hamiltonian, we slowly change the Hamiltonian to the proble…
Anonymous estimation of intensity distribution of magnetic fields with quantum sensing network
Hiroto Kasai, Yuki Takeuchi, Yuichiro Matsuzaki +1
A quantum sensing network is used to simultaneously detect and measure physical quantities, such as magnetic fields, at different locations. However, there is a risk that the measu…
Frequency-tunable magnetic field sensing using continuous-wave optically detected magnetic resonance with nitrogen-vacancy centers in diamond
Ryusei Okaniwa, Takumi Mikawa, Yuichiro Matsuzaki +8
The nitrogen-vacancy (NV) center is a promising candidate to realize practical quantum sensors with high sensitivity and high spatial resolution, even at room temperature and atmos…
A general method to construct mean field counter diabatic driving for a ground state search
Hiroshi Hayasaka, Takashi Imoto, Yuichiro Matsuzaki +1
The counter diabatic (CD) driving has attracted much attention for suppressing non-adiabatic transition in quantum annealing (QA). However, it can be intractable to construct the C…
Expressive Quantum Supervised Machine Learning using Kerr-nonlinear Parametric Oscillators
Yuichiro Mori, Kouhei Nakaji, Yuichiro Matsuzaki +1
Quantum machine learning with variational quantum algorithms (VQA) has been actively investigated as a practical algorithm in the noisy intermediate-scale quantum (NISQ) era. Recen…
Electron-spin double resonance of nitrogen-vacancy centers in diamond under strong driving field
Takumi Mikawa, Ryusei Okaniwa, Yuichiro Matsuzaki +2
The nitrogen-vacancy (NV) center in diamond has been the focus of research efforts because of its suitability for use in applications such as quantum sensing and quantum simulation…
Quantifying the Energy Relaxation Rate of Quantum States Using D-Wave Device and the Discovery of Long-Lived Multiqubit States
Takashi Imoto, Yuki Susa, Ryoji Miyazaki +1
Quantum annealing has been demonstrated with superconducting qubits. Such a quantum annealer has been used to solve combinatorial optimization problems. Moreover, it serves as a qu…
Quantum annealing showing an exponentially small success probability despite a constant energy gap with polynomial energy
Hiroshi Hayasaka, Takashi Imoto, Yuichiro Matsuzaki +1
Quantum annealing (QA) is a method for solving combinatorial optimization problems. We can estimate the computational time for QA using the adiabatic condition. The adiabatic condi…
Quantum Metrology Protected by Hilbert Space Fragmentation
Atsuki Yoshinaga, Yuichiro Matsuzaki, Ryusuke Hamazaki
We propose an entanglement-enhanced sensing scheme that is robust against spatially inhomogeneous always-on Ising interactions. Our strategy is to tailor coherent quantum dynamics…
Quantum error mitigation for rotation symmetric bosonic codes with symmetry expansion
Suguru Endo, Yasunari Suzuki, Kento Tsubouchi +4
The rotation symmetric bosonic code (RSBC) is a unified framework of practical bosonic codes that have rotation symmetries, such as cat codes and binomial codes. While cat codes ac…
Quantum annealing with error mitigation
Yuta Shingu, Tetsuro Nikuni, Shiro Kawabata +1
Quantum annealing (QA) is one of the efficient methods to calculate the ground-state energy of a problem Hamiltonian. In the absence of noise, QA can accurately estimate the ground…
Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit
Hideaki Okane, Shunsuke Kamimura, Shingo Kukita +2
We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal…
Catastrophic failure of quantum annealing owing to non-stoquastic Hamiltonian and its avoidance by decoherence
Takashi Imoto, Yuichiro Matsuzaki
Quantum annealing (QA) is a promising method for solving combinatorial optimization problems whose solutions are embedded into a ground state of the Ising Hamiltonian. This method…
Quantum annealing with symmetric subspaces
Takashi Imoto, Yuya Seki, Yuichiro Matsuzaki
Quantum annealing (QA) is a promising approach for not only solving combinatorial optimization problems but also simulating quantum many-body systems such as those in condensed mat…
Analysis of the shortest vector problems with the quantum annealing to search the excited states
Katsuki Ura, Takashi Imoto, Tetsuro Nikuni +2
The shortest vector problem (SVP) is one of the lattice problems and is mathematical basis for the lattice-based cryptography, which is expected to be post-quantum cryptography. Th…
Spectroscopic estimation of the photon number for superconducting Kerr parametric oscillators
Keisuke Matsumoto, Aiko Yamaguchi, Tsuyoshi Yamamoto +2
Quantum annealing (QA) is a way to solve combinational optimization problems. Kerr nonlinear parametric oscillators (KPOs) are promising devices for implementing QA. When we solve…
Universal Scaling Bounds on a Quantum Heat Current
Shunsuke Kamimura, Kyo Yoshida, Yasuhiro Tokura +1
We derive new bounds on a heat current flowing into a quantum -particle system coupled with a Markovian environment. By assuming that a system Hamiltonian and a system-environme…
Nonstoquastic catalyst for bifurcation-based quantum annealing of ferromagnetic -spin model
Yuki Susa, Takashi Imoto, Yuichiro Matsuzaki
Introducing a nonstoquastic catalyst is a promising avenue to improve quantum annealing with the transverse field. In the present paper, we propose a nonstoquastic catalyst for bif…
Measurement optimization of variational quantum simulation by classical shadow and derandomization
Kouhei Nakaji, Suguru Endo, Yuichiro Matsuzaki +1
Simulating large quantum systems is the ultimate goal of quantum computing. Variational quantum simulation (VQS) gives us a tool to achieve the goal in near-term devices by distrib…
How to experimentally evaluate the adiabatic condition for quantum annealing
Yuichiro Mori, Shiro Kawabata, Yuichiro Matsuzaki
We propose an experimental method for evaluating the adiabatic condition during quantum annealing (QA), which will be essential for solving practical problems. The adiabatic condit…
Temperature Sensing with RF-Dressed States of Nitrogen-Vacancy Centers in Diamond
H. Tabuchi, Y. Matsuzaki, N. Furuya +5
Nitrogen vacancy (NV) centers in diamond are promising systems for realizing sensitive temperature sensors. Pulsed optically detected magnetic resonance (Pulsed-ODMR) is one of the…