55 citations · 95 across the 20 of their papers we have counts for
20 papers
Experimental Measurement and Theoretical Analysis of Energy Relaxation Rates of an Interacting Two-Qubit System on a D-Wave Quantum Annealer
Yusei Amano, Sorato Suzuki, Hiroki Kuji +3
In D-Wave quantum annealers, various properties of the ground state have been clarified, whereas the correspondence between theory and experiment for energy relaxation rates in mul…
Identification of Phase Plate Properties Using Photonic Quantum Sensor Networks
Yusuke Machida, Hiroki Kuji, Yuichiro Mori +5
Quantum sensor networks (QSNs) have been widely studied for their potential of precise measurements. While most QSN research has focused on estimating continuous variables, recent…
Robust phase estimation of the ground-state energy without controlled time evolution on a quantum device
Hiroki Kuji, Yuta Shingu, Tetsuro Nikuni +3
Estimating the ground-state energy of Hamiltonians in quantum systems is an important task. In this work, we demonstrate that the ground-state energy can be accurately estimated wi…
Linear Regression Using Quantum Annealing with Continuous Variables
Asuka Koura, Takashi Imoto, Katsuki Ura +1
Linear regression is a data analysis technique, which is categorized as supervised learning. By utilizing known data, we can predict unknown data. Recently, researchers have explor…
Exact Bethe quantum numbers of the massive XXZ chain in the two down-spin sector
Takashi Imoto, Tetsuo Deguchi
Every solution of the Bethe ansatz equations (BAE) is characterized by a set of quantum numbers called the Bethe quantum numbers, which are fundamental for evaluating it numericall…
Universal quantum computation using quantum annealing with the transverse-field Ising Hamiltonian
Takashi Imoto, Yuki Susa, Ryoji Miyazaki +1
Quantum computation is a promising emerging technology, and by utilizing the principles of quantum mechanics, it is expected to achieve faster computations than classical computers…
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…
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…
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…
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…
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…
Generation of multipartite entanglement between spin-1 particles with bifurcation-based quantum annealing
Yuichiro Matsuzaki, Takashi Imoto, Yuki Susa
Quantum annealing is a way to solve a combinational optimization problem where quantum fluctuation is induced by transverse fields. Recently, a bifurcation-based quantum annealing…
Preparing ground states of the XXZ model using the quantum annealing with inductively coupled superconducting flux qubits
Takashi Imoto, Yuya Seki, Yuichiro Matsuzaki
Preparing ground states of Hamiltonians is important in the condensed matter physics and the quantum chemistry. The interaction Hamiltonians typically contain not only diagonal but…
Quantum annealing with twisted fields
Takashi Imoto, Yuya Seki, Yuichiro Matsuzaki and +1
Quantum annealing is a promising method for solving combinational optimization problems and performing quantum chemical calculations. The main sources of errors in quantum annealin…
Emergence of Hilbert Space Fragmentation in Ising Models with a Weak Transverse Field
Atsuki Yoshinaga, Hideaki Hakoshima, Takashi Imoto +2
The transverse-field Ising model is one of the fundamental models in quantum many-body systems, yet a full understanding of its dynamics remains elusive in higher than one dimensio…
Improving the accuracy of the energy estimation by combining quantum annealing with classical computation
Takashi Imoto, Yuya Seki, Yuichiro Matsuzaki +1
Quantum chemistry calculations are important applications of quantum annealing. For practical applications in quantum chemistry, it is essential to estimate a ground state energy o…
Exact regimes of collapsed and extra two-string solutions in the two down-spin sector of the spin-1/2 massive XXZ spin chain
Takashi Imoto, Jun Sato, Tetsuo Deguchi
We derive exactly the number of complex solutions with two down-spins in the massive regime of the periodic spin-1/2 XXZ spin chain of sites. Here we remark that every solution…