505 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- RIKEN Center for Advanced PhotonicsJP177 papers
- Computing CenterRU106 papers
- The University of TokyoJP97 papers
- RIKENJP79 papers
- RIKEN Center for Emergent Matter ScienceJP57 papers
- University of MichiganUS51 papers
- RIKEN Center for Computational ScienceJP45 papers
- The University of OsakaJP38 papers
- Pioneer (Japan)JP29 papers
- Japan Science and Technology AgencyJP26 papers
- Tokyo University of ScienceJP24 papers
- Kyoto UniversityJP14 papers
38 papers · 2 filters
Automatic quantum circuit encoding of a given arbitrary quantum state
Tomonori Shirakawa, Hiroshi Ueda, Seiji Yunoki
We propose a quantum-classical hybrid algorithm to encode a given arbitrarily quantum state onto an optimal quantum circuit with a finite numbe…
Spatial, spin, and charge symmetry projections for a Fermi-Hubbard model on a quantum computer
Kazuhiro Seki, Seiji Yunoki
We propose an extended version of the symmetry-adapted variational-quantum-eigensolver (VQE) and apply it to a two-component Fermi-Hubbard model on a bipartite lattice. In the exte…
Quantifying fermionic nonlinearity of quantum circuits
Shigeo Hakkaku, Yuichiro Tashima, Kosuke Mitarai +2
Variational quantum algorithms (VQAs) have been proposed as one of the most promising approaches to demonstrate quantum advantage on noisy intermediate-scale quantum (NISQ) devices…
Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems
Deng-Gao Lai, Wei Qin, Bang-Pin Hou +2
We propose how to achieve significantly enhanced quantum refrigeration and entanglement by coupling a pumped auxiliary cavity to an optomechanical cavity. We obtain both analytical…
Multimode optomechanical cooling via general dark-mode control
Jian Huang, Deng-Gao Lai, Cheng Liu +3
The dark-mode effect is a stubborn obstacle for ground-state cooling of multiple degenerate mechanical modes optomechanically coupled to a common cavity-field mode. Here we propose…
Continuous Dissipative Phase Transitions without Symmetry Breaking
Fabrizio Minganti, Ievgen I. Arkhipov, Adam Miranowicz +1
The paradigm of second-order phase transitions (PTs) induced by spontaneous symmetry breaking (SSB) in thermal and quantum systems is a pillar of modern physics that has been fruit…
Nonadiabatic geometric quantum computation with cat qubits via invariant-based reverse engineering
Yi-Hao Kang, Ye-Hong Chen, Xin Wang +5
We propose a protocol to realize nonadiabatic geometric quantum computation of small-amplitude Schrödinger cat qubits via invariant-based reverse engineering. We consider a system…
Work statistics in non-Hermitian evolutions with Hermitian endpoints
Zheng-Yang Zhou, Ze-Liang Xiang J. Q. You, Franco Nori
Non-Hermitian systems with specific forms of Hamiltonians can exhibit novel phenomena. However, it is difficult to study their quantum thermodynamical properties. In particular, th…
The Fermionic influence superoperator: a canonical derivation for the development of methods to simulate the influence of a Fermionic environment on a quantum system with arbitrary parity symmetry
Mauro Cirio, Po-Chen Kuo, Yueh-Nan Chen +2
We present a canonical derivation of an influence superoperator which generates the reduced dynamics of a Fermionic quantum system linearly coupled to a Fermionic environment initi…
Multipartite entanglement of the topologically ordered state in a perturbed toric code
Yu-Ran Zhang, Yu Zeng, Tao Liu +3
We demonstrate that multipartite entanglement, witnessed by the quantum Fisher information (QFI), can characterize topological quantum phase transitions in the spin- t…
Generating Gottesman-Kitaev-Preskill qubit using a cross-Kerr interaction between a squeezed light and Fock states in optics
Kosuke Fukui, Mamoru Endo, Warit Asavanant +3
Gottesman-Kitaev-Preskill (GKP) qubit is a promising ingredient for fault-tolerant quantum computation (FTQC) in optical continuous variables due to its advantage of noise toleranc…
Fault-tolerant multiqubit geometric entangling gates using photonic cat-state qubits
Ye-Hong Chen, Roberto Stassi, Wei Qin +2
We propose a theoretical protocol to implement multiqubit geometric gates (i.e., the Mølmer-Sørensen gate) using photonic cat-state qubits. These cat-state qubits stored in high-$Q…
Efficient backcasting search for optical quantum state synthesis
Kosuke Fukui, Shuntaro Takeda, Mamoru Endo +4
Non-Gaussian states are essential for many optical quantum technologies. The so-called optical quantum state synthesizer (OQSS), consisting of Gaussian input states, linear optics,…
Fast universal quantum control above the fault-tolerance threshold in silicon
Akito Noiri, Kenta Takeda, Takashi Nakajima +4
Fault-tolerant quantum computers which can solve hard problems rely on quantum error correction. One of the most promising error correction codes is the surface code, which require…
Matrix Model simulations using Quantum Computing, Deep Learning, and Lattice Monte Carlo
Enrico Rinaldi, Xizhi Han, Mohammad Hassan +4
Matrix quantum mechanics plays various important roles in theoretical physics, such as a holographic description of quantum black holes. Understanding quantum black holes and the r…
Deterministic one-way logic gates on a cloud quantum computer
Zhi-Peng Yang, Alakesh Baishya, Huan-Yu Ku +6
One-way quantum computing is a promising candidate for fault-tolerant quantum computing. Here, we propose new protocols to realize a deterministic one-way CNOT gate and one-way …
Optomechanical dynamics in the - and broken--symmetric regimes
Hai Xu, Deng-Gao Lai, Yi-Bing Qian +3
We theoretically study the dynamics of typical optomechanical systems, consisting of a passive optical mode and an active mechanical mode, in the - and broken-$\mathc…
Revealing higher-order light and matter energy exchanges using quantum trajectories in ultrastrong coupling
V. Macrì, F. Minganti, A. F. Kockum +3
The dynamics of open quantum systems is often modelled using master equations, which describe the expected outcome of an experiment (i.e., the average over many realizations of the…
Ultrastrong tunable coupler between superconducting LC resonators
Takafumi Miyanaga, Akiyoshi Tomonaga, Hikaru Ito +2
We investigate the ultrastrong tunable coupler for coupling of superconducting resonators. Obtained coupling constant exceeds 1 GHz, and the wide range tunability is achieved both…
Flattening the Curve with Einstein's Quantum Elevator: Hermitization of Non-Hermitian Hamiltonians via a Generalized Vielbein Formalism
Chia-Yi Ju, Adam Miranowicz, Fabrizio Minganti +3
The formalism for non-Hermitian quantum systems sometimes blurs the underlying physics. We present a systematic study of the vielbein-like formalism which transforms the Hilbert sp…
Magnetic-free traveling-wave nonreciprocal superconducting microwave components
Dengke Zhang, Jaw-Shen Tsai
We propose a design to realize integrated broadband nonreciprocal microwave isolators and circulators using superconducting circuit elements without any magnetic materials. To obta…
Quantifying Quantumness of Channels Without Entanglement
Huan-Yu Ku, Josef Kadlec, Antonín Černoch +8
Quantum channels breaking entanglement, incompatibility, or nonlocality are defined as such because they are not useful for entanglement-based, one-sided device-independent, or dev…
Universal noise-precision relations in variational quantum algorithms
Kosuke Ito, Wataru Mizukami, Keisuke Fujii
Variational quantum algorithms (VQAs) are expected to become a practical application of near-term noisy quantum computers. Although the effect of the noise crucially determines whe…
Quasiparticle tunneling and 1/f charge noise in ultrastrongly coupled superconducting qubit and resonator
Akiyoshi Tomonaga, Hiroto Mukai, Fumiki Yoshihara +1
We report an experimentally observed anomalous doubly split spectrum and its split-width fluctuation in an ultrastrongly coupled superconducting qubit and resonator. From an analys…