3.7k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- RIKENJP222 papers
- The University of TokyoJP99 papers
- RIKEN Nishina CenterJP75 papers
- Kyoto UniversityJP66 papers
- Yukawa Institute for Theoretical PhysicsJP37 papers
- Kavli Institute for the Physics and Mathematics of the UniverseJP28 papers
- High Energy Accelerator Research OrganizationJP25 papers
- Tohoku UniversityJP24 papers
- The University of OsakaJP22 papers
- Nihon UniversityJP21 papers
- Tokyo Institute of TechnologyJP21 papers
- Keio UniversityJP19 papers
41 papers · 1 filter
Elucidating Many-Body Effects in Molecular Core Spectra through Real-Time Approaches: Efficient Classical Approximations and a Quantum Perspective
Vibin Abraham, Priyabrata Senapati, Himadri Pathak +1
Accurately resolving many-body satellite features in molecular core-level spectra requires theoretical approaches that capture electron correlation both efficiently and systematica…
Local spreading of stabilizer Rényi entropy in a brickwork random Clifford circuit
Somnath Maity, Ryusuke Hamazaki
Nonstabilizerness, or magic, constitutes a fundamental resource for quantum computation and a crucial ingredient for quantum advantage. Recent progress has substantially advanced t…
Krylov Complexity Under Hamiltonian Deformations and Toda Flows
Kazutaka Takahashi, Pratik Nandy, Adolfo del Campo
The quantum dynamics of a complex system can be efficiently described in Krylov space, the minimal subspace in which the dynamics unfolds. We apply the Krylov subspace method for H…
Optimal Work Extraction from Finite-Time Closed Quantum Dynamics
Shoki Sugimoto, Takahiro Sagawa, Ryusuke Hamazaki
Extracting useful work from quantum systems is a fundamental problem in quantum thermodynamics. In scenarios where rapid protocols are desired -- whether due to practical constrain…
Quasiprobability Thermodynamic Uncertainty Relation
Kohei Yoshimura, Ryusuke Hamazaki
We derive a quantum extension of the thermodynamic uncertainty relation where dynamical fluctuations are quantified by the Terletsky-Margenau-Hill quasiprobability, a quantum gener…
Simulating sparse SYK model with a randomized algorithm on a trapped-ion quantum computer
Etienne Granet, Yuta Kikuchi, Henrik Dreyer +1
The Sachdev-Ye-Kitaev (SYK) model describes a strongly correlated quantum system that shows a strong signature of quantum chaos. Due to its chaotic nature, the simulation of real-t…
Scalable Simulation of Quantum Many-Body Dynamics with Or-Represented Quantum Algebra
Lukas Broers, Rong-Yang Sun, Seiji Yunoki
High-performance numerical methods are essential not only for advancing quantum many-body physics but also for enabling integration with emerging quantum computing platforms. We pr…
Computing n-time correlation functions without ancilla qubits
Xiaoyang Wang, Long Xiong, Xiaoxia Cai +1
The -time correlation function is pivotal for establishing connections between theoretical predictions and experimental observations of a quantum system. Conventional methods fo…
Transitions of the Lyapunov spectrum and entanglement entropy in monitored quantum dynamics with homogeneous unitary gates
Ken Mochizuki, Ryusuke Hamazaki
We explore the Lyapunov spectrum and entanglement entropy in systems evolved by quantum measurements and spatially homogeneous unitary gates. In models with temporally random and F…
A deep neural network approach to solve the Dirac equation
Chuanxin Wang, Tomoya Naito, Jian Li +1
We extend the method from [Naito, Naito, and Hashimoto, Phys. Rev. Research 5, 033189 (2023)] to solve the Dirac equation not only for the ground state but also for low-lying excit…
Krylov space approach to Singular Value Decomposition in non-Hermitian systems
Pratik Nandy, Tanay Pathak, Zhuo-Yu Xian +1
We propose a tridiagonalization approach for non-Hermitian random matrices and Hamiltonians using singular value decomposition (SVD). This technique leverages the real and non-nega…
Krylov fractality and complexity in generic random matrix ensembles
Budhaditya Bhattacharjee, Pratik Nandy
Krylov space methods provide an efficient framework for analyzing the dynamical aspects of quantum systems, with tridiagonal matrices playing a key role. Despite their importance,…
Characterization and generation of a SQL-beating catlike state through repetitive measurements
Mamiko Tatsuta, Yuichiro Matsuzaki, Hiroki Kuji +2
Sensitivity in metrology without entanglement is limited by the standard quantum limit (SQL). Recent studies have found that the Heisenberg-limited scaling, the ultimate sensitivit…
Measurement-Induced Spectral Transition
Ken Mochizuki, Ryusuke Hamazaki
We show that noisy quantum dynamics exposed to weak measurements exhibit a spectral transition between gapless and gapped phases. To this end, we employ the Lyapunov spectrum obtai…
Probing quantum chaos through singular-value correlations in sparse non-Hermitian SYK model
Pratik Nandy, Tanay Pathak, Masaki Tezuka
Utilizing singular value decomposition, our investigation focuses on the spectrum of the singular values within a sparse non-Hermitian Sachdev-Ye-Kitaev (SYK) model. Unlike the com…
Quantum Dynamics in Krylov Space: Methods and Applications
Pratik Nandy, Apollonas S. Matsoukas-Roubeas, Pablo Martínez-Azcona +2
The dynamics of quantum systems unfolds within a subspace of the state space or operator space, known as the Krylov space. This review presents the use of Krylov subspace methods t…
Chemistry Beyond the Scale of Exact Diagonalization on a Quantum-Centric Supercomputer
Javier Robledo-Moreno, Mario Motta, Holger Haas +14
A universal quantum computer can simulate diverse quantum systems, with electronic structure for chemistry offering challenging problems for practical use cases around the hundred-…
Unveiling clean two-dimensional discrete time crystals on a digital quantum computer
Kazuya Shinjo, Kazuhiro Seki, Tomonori Shirakawa +2
In periodically driven (Floquet) systems, evolution typically results in an infinite-temperature thermal state due to continuous energy absorption over time. However, before reachi…
Improved real-space parallelizable matrix-product state compression and its application to unitary quantum dynamics simulation
Rong-Yang Sun, Tomonori Shirakawa, Seiji Yunoki
Towards the efficient simulation of near-term quantum devices using tensor network states, we introduce an improved real-space parallelizable matrix-product state (MPS) compression…
Operator dynamics in Lindbladian SYK: a Krylov complexity perspective
Budhaditya Bhattacharjee, Pratik Nandy, Tanay Pathak
We use Krylov complexity to study operator growth in the -body dissipative SYK model, where the dissipation is modeled by linear and random -body Lindblad operators. In the l…
Absorption to Fluctuating Bunching States in Non-Unitary Boson Dynamics
Ken Mochizuki, Ryusuke Hamazaki
We show that noisy nonunitary dynamics of bosons drives arbitrary initial states into a novel fluctuating bunching state, where all bosons occupy one time-dependent mode. We propos…
On Krylov complexity in open systems: an approach via bi-Lanczos algorithm
Aranya Bhattacharya, Pratik Nandy, Pingal Pratyush Nath +1
Continuing the previous initiatives arXiv: 2207.05347 and arXiv: 2212.06180, we pursue the exploration of operator growth and Krylov complexity in dissipative open quantum systems.…
Distinguishability Transitions in Non-Unitary Boson Sampling Dynamics
Ken Mochizuki, Ryusuke Hamazaki
We discover novel transitions characterized by distinguishability of bosons in non-unitary dynamics with parity-time () symmetry. We show that symmetry…
Greedy parameter optimization for diabatic quantum annealing
Tadashi Kadowaki, Hidetoshi Nishimori
A shorter processing time is desirable for quantum computation to minimize the effects of noise. We propose a simple procedure to variationally determine a set of parameters in the…