81 citations · 482 across the 29 of their papers we have counts for
31 papers
Polylog-depth Quantum Thermal Simulation via Local Recovery Channels
Hideaki Hakoshima, Atsushi Iwaki, Nobuyuki Yoshioka
We establish sufficient conditions for preparing quantum thermal states of noncommuting local Hamiltonians with polylogarithmic circuit depth in arbitrary fixed spatial dimension.…
Quantum Complexity of Ancilla-Free Unitary Embeddings for Nonlinear Dynamics via Generalized State-Dependent Double-Bracket Flows
Yuki Ito, Hideaki Hakoshima, Keisuke Fujii
Simulating nonlinear dynamics with quantum computers has gained increasing attention. In general, such simulations require additional quantum resources because unitary quantum evol…
Non-Markovianity in Quantum Information Processing: Interplay with Quantum Error Mitigation
Suguru Endo, Hideaki Hakoshima, Tomohiro Shitara
Non-Markovian dynamics are typically present in the dynamics of open quantum systems. Despite the rich structure of non-Markovian dynamics, their relevance to quantum information p…
Nontrivial multi-product commutation relation toward reducing T-count in sequential Pauli-based computation
Yusei Mori, Hideaki Hakoshima, Keisuke Fujii
Quantum compilers that reduce the number of T gates are essential for minimizing the overhead of fault-tolerant quantum computation. Achieving further T-count reduction calls for i…
Hardware-efficient quantum annealing with error mitigation via classical shadow
Takaharu Yoshida, Yuta Shingu, Chihaya Shimada +3
Quantum annealing (QA) is an efficient method for finding the ground-state energy of the problem Hamiltonian. However, in practical implementation, the system suffers from decohere…
Quantum Circuit Unoptimization
Yusei Mori, Hideaki Hakoshima, Kyohei Sudo +3
Optimization of circuits is an essential task for both quantum and classical computers to improve their efficiency. In contrast, classical logic optimization is known to be difficu…
Resource-efficient Generalized Quantum Subspace Expansion
Bo Yang, Nobuyuki Yoshioka, Hiroyuki Harada +5
Realizing practical quantum computing requires overcoming a number of computation errors and the limitation of device size, which have intensively been tackled by quantum error mit…
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…
A comprehensive survey on quantum computer usage: How many qubits are employed for what purposes?
Tsubasa Ichikawa, Hideaki Hakoshima, Koji Inui +18
Quantum computers (QCs), which work based on the law of quantum mechanics, are expected to be faster than classical computers in several computational tasks such as prime factoring…
QAOA-MC: Markov chain Monte Carlo enhanced by Quantum Alternating Operator Ansatz
Yuichiro Nakano, Hideaki Hakoshima, Kosuke Mitarai +1
Quantum computation is expected to accelerate certain computational task over classical counterpart. Its most primitive advantage is its ability to sample from classically intracta…
Quantum statistical effect induced through conditioned post-processing procedures with unitary -designs
Hideaki Hakoshima, Tsubasa Ichikawa
We propose a few-body quantum phenomenon, which manifests itself through stochastic state preparations and measurements followed by a conditioned post-processing procedure. We show…
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…
Error-Mitigated Quantum Metrology via Virtual Purification
Kaoru Yamamoto, Suguru Endo, Hideaki Hakoshima +2
Quantum metrology with entangled resources aims to achieve sensitivity beyond the standard quantum limit by harnessing quantum effects even in the presence of environmental noise.…
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…
Calculation of Gibbs partition function with imaginary time evolution on near-term quantum computers
Keisuke Matsumoto, Yuta Shingu, Suguru Endo +5
The Gibbs partition function is an important quantity in describing statistical properties of a system in thermodynamic equilibrium. There are several proposals to calculate the pa…
Generalized quantum subspace expansion
Nobuyuki Yoshioka, Hideaki Hakoshima, Yuichiro Matsuzaki +3
One of the major challenges for erroneous quantum computers is undoubtedly the control over the effect of noise. Considering the rapid growth of available quantum resources that ar…
Variational secure cloud quantum computing
Yuta Shingu, Yuki Takeuchi, Suguru Endo +5
Variational quantum algorithms (VQAs) have been considered to be useful applications of noisy intermediate-scale quantum (NISQ) devices. Typically, in the VQAs, a parametrized ansa…
Quantum-Enhanced Heat Engine Based on Superabsorption
S. Kamimura, H. Hakoshima, Y. Matsuzaki +2
We propose a quantum-enhanced heat engine with entanglement. The key feature of our scheme is superabsorption, which facilitates enhanced energy absorption by entangled qubits. Whe…
Anonymous quantum sensing
Hiroto Kasai, Yuki Takeuchi, Hideaki Hakoshima +2
A lot of attention has been paid to a quantum-sensing network for detecting magnetic fields in different positions. Recently, cryptographic quantum metrology was investigated where…
Proposed rapid detection of nuclear spins with entanglement-enhanced sensors
Hideaki Hakoshima, Yuichiro Matsuzaki, Toyofumi Ishikawa
Recently, there have been significant developments to detect nuclear spins with an nitrogen vacancy (NV) center in diamond. However, due to the nature of the short range dipole-dip…
Quantum sensing to suppress systematic errors with measurements in the Zeno regime
Alisa Shimada, Hideaki Hakoshima, Suguru Endo +2
Quantum magnetic field sensing is an important technology for material science and biology. Although experimental imperfections affect the sensitivity, repetitions of the measureme…
Possibility of the total thermodynamic entropy production rate of a finite-sized isolated quantum system to be negative for the Gorini-Kossakowski-Sudarshan-Lindblad-type Markovian dynamics of its subsystem
Takaaki Aoki, Yuichiro Matsuzaki, Hideaki Hakoshima
We investigate a total thermodynamic entropy production rate of an isolated quantum system. In particular, we consider a quantum model of coupled harmonic oscillators in a star con…
Relationship between costs for quantum error mitigation and non-Markovian measures
Hideaki Hakoshima, Yuichiro Matsuzaki, Suguru Endo
Quantum error mitigation (QEM) has been proposed as an alternative method of quantum error correction to compensate errors in quantum systems without qubit overhead. While Markovia…
Quantum remote sensing under the effect of dephasing
Hideaki Okane, Hideaki Hakoshima, Yuki Takeuchi +2
The quantum remote sensing (QRS) is a scheme to add security about the measurement results of a qubit-based sensor. A client delegates a measurement task to a remote server that ha…