51 citations · 106 across the 13 of their papers we have counts for
18 papers
Sample-based Quantum Diagonalization via Density Matrix Renormalization Group
Yuto Sugimoto, Tomonori Shirakawa, Yukio Kawashima +2
We introduce SqDMRG, which combines sample-based quantum diagonalization (SQD) with the density matrix renormalization group (DMRG). SqDMRG expands the sampled determinant space in…
Quantum--classical break-even in electronic dynamics of macrocyclic molecules
Shu Kanno, Kenji Sugisaki, Takashi Imamichi +5
Here we demonstrate quantum--classical break-even for chemical dynamics applications, reaching useful accuracy with a quantum-hardware wall-clock time comparable to that estimated…
Point-group symmetry analysis of many-electron wavefunctions on a quantum computer
Rei Sakuma, Kenji Sugisaki, Shu Kanno +2
A point group is a set of spatial symmetry operations in molecular systems and is an indispensable tool for analyzing molecular orbitals and spectroscopy experiments in chemistry.…
Crossing the 12,000-atom barrier with heterogeneous quantum-classical supercomputing: quantum chemistry of protein-ligand complexes
Kenneth M. Merz, Akhil Shajan, Danil Kaliakin +21
We develop a workflow decomposing a molecule into fragments via quantum embedding and simulating them with a heterogeneous quantum-classical (HQC) method. We sample fragment electr…
Closed-loop calculations of electronic structure on a quantum processor and a classical supercomputer at full scale
Tomonori Shirakawa, Javier Robledo-Moreno, Toshinari Itoko +18
Quantum computers must operate in concert with classical computers to deliver on the promise of quantum advantage for practical problems. To achieve that, it is important to unders…
Shift of quantum critical point of discrete time crystal on a noisy quantum simulator
Yuta Hirasaki, Toshinari Itoko, Naoki Kanazawa +1
Recent advances in quantum technology have enabled the simulation of quantum many-body systems on real quantum devices. However, such quantum simulators are inherently subject to d…
Multilevel Circuit Optimization in Quantum Compilers: A Case Study
Tamiya Onodera, Yuki Sato, Toshinari Itoko +1
In this paper, we explore multilevel circuit optimization (MLCO), where we deploy multiple gate sets and progressively lower the source circuit through the gate sets to the target…
Quantum Optimization Benchmarking Library - The Intractable Decathlon
Thorsten Koch, David E. Bernal Neira, Ying Chen +24
Through recent progress in hardware development, quantum computers have advanced to the point where benchmarking of (heuristic) quantum algorithms at scale is within reach. Particu…
Hamiltonian simulation-based quantum-selected configuration interaction for large-scale electronic structure calculations with a quantum computer
Kenji Sugisaki, Shu Kanno, Toshinari Itoko +2
Quantum-selected configuration interaction (QSCI) is an approach for quantum chemical calculations using current quantum computers. In conventional QSCI, Slater determinants used f…
Dynamics of measurement-induced state transitions in superconducting qubits
Yuta Hirasaki, Shunsuke Daimon, Naoki Kanazawa +3
We have investigated temporal fluctuation of superconducting qubits via the time-resolved measurement for an IBM Quantum system. We found that the qubit error rate abruptly changes…
Robust Error Accumulation Suppression for Quantum Circuits
Tatsuki Odake, Philip Taranto, Nobuyuki Yoshioka +4
We present a \textit{robust error accumulation suppression} (\textbf{REAS}) technique to manage errors in quantum computers. Our method reduces the accumulation of errors in any qu…
Three-qubit Parity Gate via Simultaneous Cross Resonance Drives
Toshinari Itoko, Moein Malekakhlagh, Naoki Kanazawa +1
Native multi-qubit parity gates have various potential quantum computing applications, such as entanglement creation, logical state encoding and parity measurement in quantum error…
Detection of temporal fluctuation in superconducting qubits for quantum error mitigation
Yuta Hirasaki, Shunsuke Daimon, Toshinari Itoko +2
We have investigated instability of a superconducting quantum computer by continuously monitoring the qubit output. We found that qubits exhibit a step-like change in the error rat…
Approximate Solutions of Combinatorial Problems via Quantum Relaxations
Bryce Fuller, Charles Hadfield, Jennifer R. Glick +8
Combinatorial problems are formulated to find optimal designs within a fixed set of constraints. They are commonly found across diverse engineering and scientific domains. Understa…
Sampling Strategy Optimization for Randomized Benchmarking
Toshinari Itoko, Rudy Raymond
Randomized benchmarking (RB) is a widely used method for estimating the average fidelity of gates implemented on a quantum computing device. The stochastic error of the average gat…
Scheduling of Operations in Quantum Compiler
Toshinari Itoko, Takashi Imamichi
When scheduling quantum operations, a shorter overall execution time of the resulting schedule yields a better throughput and higher fidelity output. In this paper, we demonstrate…
Demonstration of quantum volume 64 on a superconducting quantum computing system
Petar Jurcevic, Ali Javadi-Abhari, Lev S. Bishop +28
We improve the quality of quantum circuits on superconducting quantum computing systems, as measured by the quantum volume, with a combination of dynamical decoupling, compiler opt…
Optimization of Quantum Circuit Mapping using Gate Transformation and Commutation
Toshinari Itoko, Rudy Raymond, Takashi Imamichi +1
This paper addresses quantum circuit mapping for Noisy Intermediate-Scale Quantum (NISQ) computers. Since NISQ computers constraint two-qubit operations on limited couplings, an in…