975 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP429 papers
- Kyoto UniversityJP151 papers
- RIKENJP142 papers
- Tokyo Institute of TechnologyJP134 papers
- High Energy Accelerator Research OrganizationJP100 papers
- Tohoku UniversityJP100 papers
- Nagoya UniversityJP97 papers
- The University of OsakaJP96 papers
- Tokyo University of ScienceJP90 papers
- Japan Science and Technology AgencyJP68 papers
- UNSW SydneyAU63 papers
- Centre National de la Recherche ScientifiqueFR62 papers
27 papers · 2 filters
Post-Hartree-Fock method in Quantum Chemistry for Quantum Computer
Yutaka Shikano, Hiroshi C. Watanabe, Ken M. Nakanishi +1
Quantum computational chemistry is a potential application of quantum computers that is expected to effectively solve several quantum-chemistry problems, particularly the electroni…
Quantum semi-supervised generative adversarial network for enhanced data classification
Kouhei Nakaji, Naoki Yamamoto
In this paper, we propose the quantum semi-supervised generative adversarial network (qSGAN). The system is composed of a quantum generator and a classical discriminator/classifier…
Modified Grover operator for amplitude estimation
Shumpei Uno, Yohichi Suzuki, Keigo Hisanaga +4
In this paper, we propose a quantum amplitude estimation method that uses a modified Grover operator and quadratically improves the estimation accuracy in the ideal case, as in the…
Efficient Construction of a Control Modular Adder on a Carry-Lookahead Adder Using Relative-phase Toffoli Gates
Kento Oonishi, Tomoki Tanaka, Shumpei Uno +3
Control modular addition is a core arithmetic function, and we must consider the computational cost for actual quantum computers to realize efficient implementation. To achieve a l…
Absence of fast scrambling in thermodynamically stable long-range interacting systems
Tomotaka Kuwahara, Keiji Saito
In this study, we investigate out-of-time-order correlators (OTOCs) in systems with power-law decaying interactions such as , where is the distance. In such systems, th…
Ultra-fast Hong-Ou-Mandel interferometry via temporal filtering
Yoshiaki Tsujimoto, Kentaro Wakui, Mikio Fujiwara +2
Heralded single photons (HSPs) generated by spontaneous parametric down-conversion (SPDC) are useful resource to achieve various photonic quantum information processing. Given a la…
Finding Small and Large k-Clique Instances on a Quantum Computer
Sara Ayman Metwalli, Francois Le Gall, Rodney Van Meter
Algorithms for triangle-finding, the smallest nontrivial instance of the k-clique problem, have been proposed for quantum computers. Still, those algorithms assume the use of fixed…
Applications of Quantum Computing for Investigations of Electronic Transitions in Phenylsulfonyl-carbazole TADF Emitters
Qi Gao, Gavin O. Jones, Mario Motta +7
A quantum chemistry study of the first singlet (S1) and triplet (T1) excited states of phenylsulfonyl-carbazole compounds, proposed as useful thermally activated delayed fluorescen…
Quantum speed limit for robust state characterization and engineering
Kohei Kobayashi, Naoki Yamamoto
In this paper, we propose a concept to use a quantum speed limit (QSL) as a measure of robustness of states, defining that a state with bigger QSL is more robust. In this perspecti…
Exact bounds for dynamical critical exponents of transverse-field Ising chains with a correlated disorder
Tatsuhiko Shirai, Shu Tanaka
This study investigates the dynamical critical exponent of disordered Ising chains under transverse fields to examine the effect of a correlated disorder on quantum phase transitio…
Spin coherence and depths of single nitrogen-vacancy centers created by ion implantation into diamond via screening masks
Shuntaro Ishizu, Kento Sasaki, Daiki Misonou +3
We characterize single nitrogen-vacancy (NV) centers created by 10-keV N+ ion implantation into diamond via thin SiO layers working as screening masks. Despite the relatively h…
Amplitude estimation via maximum likelihood on noisy quantum computer
Tomoki Tanaka, Yohichi Suzuki, Shumpei Uno +3
Recently we find several candidates of quantum algorithms that may be implementable in near-term devices for estimating the amplitude of a given quantum state, which is a core sub-…
Detection and control of single proton spins in a thin layer of diamond grown by chemical vapor deposition
Kento Sasaki, Hideyuki Watanabe, Hitoshi Sumiya +2
We report detection and coherent control of a single proton nuclear spin using an electronic spin of the nitrogen-vacancy (NV) center in diamond as a quantum sensor. In addition to…
Enhancing VQE Convergence for Optimization Problems with Problem-specific Parameterized Quantum Circuits
Atsushi Matsuo, Yudai Suzuki, Ikko Hamamura +1
The Variational Quantum Eigensolver (VQE) algorithm is gaining interest for its potential use in near-term quantum devices. In the VQE algorithm, parameterized quantum circuits (PQ…
Quantum self-learning Monte Carlo with quantum Fourier transform sampler
Katsuhiro Endo, Taichi Nakamura, Keisuke Fujii +1
The self-learning Metropolis-Hastings algorithm is a powerful Monte Carlo method that, with the help of machine learning, adaptively generates an easy-to-sample probability distrib…
Expressibility of the alternating layered ansatz for quantum computation
Kouhei Nakaji, Naoki Yamamoto
The hybrid quantum-classical algorithm is actively examined as a technique applicable even to intermediate-scale quantum computers. To execute this algorithm, the hardware efficien…
Attacking the Quantum Internet
Takahiko Satoh, Shota Nagayama, Shigeya Suzuki +3
The main service provided by the coming Quantum Internet will be creating entanglement between any two quantum nodes. We discuss and classify attacks on quantum repeaters, which wi…
Control of all the transitions between ground state manifolds of nitrogen vacancy centers in diamonds by applying external magnetic driving fields
Tatsuma Yamaguchi, Yuichiro Matsuzaki, Soya Saijo +3
Nitrogen vacancy (NV) centers in diamonds is a promising system for quantum information processing and quantum sensing, and the control of the quantum state is essential for practi…
Exchange coupling in a linear chain of three quantum-dot spin qubits in silicon
Kok Wai Chan, Harshad Sahasrabudhe, Wister Huang +12
Quantum gates between spin qubits can be implemented leveraging the natural Heisenberg exchange interaction between two electrons in contact with each other. This interaction is co…
Detecting Temporal Correlation via Quantum Random Number Generation
Yutaka Shikano, Kentaro Tamura, Rudy Raymond
All computing devices, including quantum computers, must exhibit that for a given input, an output is produced in accordance with the program. The outputs generated by quantum comp…
Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
Amanda Seedhouse, Tuomo Tanttu, Ross C. C. Leon +12
Quantum computation relies on accurate measurements of qubits not only for reading the output of the calculation, but also to perform error correction. Most proposed scalable silic…
Proceedings 9th International Conference on Quantum Simulation and Quantum Walks
Giuseppe Di Molfetta, Vivien Kendon, Yutaka Shikano
This volume contains a selection of papers presented at the 9th in a series of international conferences on Quantum Simulation and Quantum Walks (QSQW). During this event, we worke…
Construction and operation of a tabletop system for nanoscale magnetometry with single nitrogen-vacancy centers in diamond
Daiki Misonou, Kento Sasaki, Shuntaro Ishizu +3
A single nitrogen-vacancy (NV) center in diamond is a prime candidate for a solid-state quantum magnetometer capable of detecting single nuclear spins with prospective application…
A general formulation of time-optimal quantum control and optimality of singular protocols
Hiroaki Wakamura, Tatsuhiko Koike
We present a general theoretical framework for finding the time-optimal unitary evolution of the quantum systems when the Hamiltonian is subject to arbitrary constraints. Quantum b…