318 citations · 891 across the 9 of their papers we have counts for
9 papers
Systematic construction of multi-controlled Pauli gate decompositions with optimal -count
Ken M. Nakanishi, Synge Todo
Multi-controlled Pauli gates are typical high-level qubit operations that appear in the quantum circuits of various quantum algorithms. We find multi-controlled Pauli gate decompos…
Digital quantum simulator for the time-dependent Dirac equation using discrete-time quantum walks
Shigetora Miyashita, Takahiko Satoh, Michihiko Sugawara +5
We introduce a quantum algorithm for simulating the time-dependent Dirac equation in 3+1 dimensions using discrete-time quantum walks. Thus far, promising quantum algorithms have b…
Quantum-gate decomposer
Ken M. Nakanishi, Takahiko Satoh, Synge Todo
Efficient decompositions of multi-qubit gates are essential in NISQ applications, where the number of gates or the circuit depth is limited. This paper presents efficient decomposi…
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…
Qulacs: a fast and versatile quantum circuit simulator for research purpose
Yasunari Suzuki, Yoshiaki Kawase, Yuya Masumura +17
To explore the possibilities of a near-term intermediate-scale quantum algorithm and long-term fault-tolerant quantum computing, a fast and versatile quantum circuit simulator is n…
Subspace Variational Quantum Simulator
Kentaro Heya, Ken M Nakanishi, Kosuke Mitarai +8
Quantum simulation is one of the key applications of quantum computing, which accelerates research and development in the fields such as chemistry and material science. The recent…
Sequential minimal optimization for quantum-classical hybrid algorithms
Ken M. Nakanishi, Keisuke Fujii, Synge Todo
We propose a sequential minimal optimization method for quantum-classical hybrid algorithms, which converges faster, is robust against statistical error, and is hyperparameter-free…
Subspace-search variational quantum eigensolver for excited states
Ken M Nakanishi, Kosuke Mitarai, Keisuke Fujii
The variational quantum eigensolver (VQE), a variational algorithm to obtain an approximated ground state of a given Hamiltonian, is an appealing application of near-term quantum c…
Neural Multi-scale Image Compression
Ken Nakanishi, Shin-ichi Maeda, Takeru Miyato +1
This study presents a new lossy image compression method that utilizes the multi-scale features of natural images. Our model consists of two networks: multi-scale lossy autoencoder…