190 citations · 935 across the 25 of their papers we have counts for
26 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.…
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…
Work extractability from energy eigenstates under optimized local operations
Shotaro Z. Baba, Nobuyuki Yoshioka, Takahiro Sagawa
We examine the relationship between the second law of thermodynamics and the energy eigenstates of quantum many-body systems that undergo cyclic unitary evolution. Using a numerica…
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…
Nonlinearity-induced topological phase transition characterized by the nonlinear Chern number
Kazuki Sone, Motohiko Ezawa, Yuto Ashida +2
As first demonstrated by the characterization of the quantum Hall effect by the Chern number, topology provides a guiding principle to realize robust properties of condensed matter…
Clifford Group and Unitary Designs under Symmetry
Yosuke Mitsuhashi, Nobuyuki Yoshioka
We have generalized the well-known statement that the Clifford group is a unitary 3-design into symmetric cases by extending the notion of unitary design. Concretely, we have prove…
Leveraging hardware-control imperfections for error mitigation via generalized quantum subspace
Yasuhiro Ohkura, Suguru Endo, Takahiko Satoh +2
In the era of quantum computing without full fault-tolerance, it is essential to suppress noise effects via the quantum error mitigation techniques to enhance the computational pow…
Virtual quantum error detection
Kento Tsubouchi, Yasunari Suzuki, Yuuki Tokunaga +2
Quantum error correction and quantum error detection necessitate syndrome measurements to detect errors. Performing syndrome measurements for each stabilizer generator can be a sig…
Hunting for quantum-classical crossover in condensed matter problems
Nobuyuki Yoshioka, Tsuyoshi Okubo, Yasunari Suzuki +2
The intensive pursuit for quantum advantage in terms of computational complexity has further led to a modernized crucial question: {\it When and how will quantum computers outperfo…
Universal cost bound of quantum error mitigation based on quantum estimation theory
Kento Tsubouchi, Takahiro Sagawa, Nobuyuki Yoshioka
We present a unified approach to analyzing the cost of various quantum error mitigation methods on the basis of quantum estimation theory. By analyzing the quantum Fisher informati…
Deep reinforcement learning for preparation of thermal and prethermal quantum states
Shotaro Z. Baba, Nobuyuki Yoshioka, Yuto Ashida +1
We propose a method based on deep reinforcement learning that efficiently prepares a quantum many-body pure state in thermal or prethermal equilibrium. The main physical intuition…
Quantum Fluctuation Theorem under Continuous Measurement and Feedback
Toshihiro Yada, Nobuyuki Yoshioka, Takahiro Sagawa
While the fluctuation theorem in classical systems has been thoroughly generalized under various feedback control setups, an intriguing situation in quantum systems, namely under c…
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…
Purifying Deep Boltzmann Machines for Thermal Quantum States
Yusuke Nomura, Nobuyuki Yoshioka, Franco Nori
We develop two cutting-edge approaches to construct deep neural networks representing the purified finite-temperature states of quantum many-body systems. Both methods commonly aim…
Solving Quasiparticle Band Spectra of Real Solids using Neural-Network Quantum States
Nobuyuki Yoshioka, Wataru Mizukami, Franco Nori
Establishing a predictive ab initio method for solid systems is one of the fundamental goals in condensed matter physics and computational materials science. The central challenge…
Variational Quantum Simulation for Periodic Materials
Nobuyuki Yoshioka, Takeshi Sato, Yuya O. Nakagawa +2
We present a quantum-classical hybrid algorithm that simulates electronic structures of periodic systems such as ground states and quasiparticle band structures. By extending the u…
Error bounds for constrained dynamics in gapped quantum systems: Rigorous results and generalizations
Zongping Gong, Nobuyuki Yoshioka, Naoyuki Shibata +1
In arXiv:2001.03419 we introduce a universal error bound for constrained unitary dynamics within a well-gapped energy band of an isolated quantum system. Here, we provide the full…
Universal Error Bound for Constrained Quantum Dynamics
Zongping Gong, Nobuyuki Yoshioka, Naoyuki Shibata +1
It is well known in quantum mechanics that a large energy gap between a Hilbert subspace of specific interest and the remainder of the spectrum can suppress transitions from the qu…
Onsager's Scars in Disordered Spin Chains
Naoyuki Shibata, Nobuyuki Yoshioka, Hosho Katsura
We propose a class of non-integrable quantum spin chain models that exhibit quantum many-body scars even in the presence of disorder. With the use of the so-called Onsager symmetry…
Variational Quantum Algorithm for Non-equilibrium Steady States
Nobuyuki Yoshioka, Yuya O. Nakagawa, Kosuke Mitarai +1
We propose a quantum-classical hybrid algorithm to simulate the non-equilibrium steady state of an open quantum many-body system, named the dissipative-system Variational Quantum E…
Constructing neural stationary states for open quantum many-body systems
Nobuyuki Yoshioka, Ryusuke Hamazaki
We propose a new variational scheme based on the neural-network quantum states to simulate the stationary states of open quantum many-body systems. Using the high expressive power…
Transforming Generalized Ising Model into Boltzmann Machine
Nobuyuki Yoshioka, Yutaka Akagi, Hosho Katsura
We find an exact mapping from the generalized Ising models with many-spin interactions to equivalent Boltzmann machines, i.e., the models with only two-spin interactions between ph…
Spontaneous thermal Hall effect in three-dimensional chiral superconductors with gap nodes
Nobuyuki Yoshioka, Yoshiki Imai, Manfred Sigrist
Generic chiral superconductors with three-dimensional electronic structure have nodal gaps and are not strictly topological. Nevertheless, they exhibit a spontaneous thermal Hall e…
Learning Disordered Topological Phases by Statistical Recovery of Symmetry
Nobuyuki Yoshioka, Yutaka Akagi, Hosho Katsura
In this letter, we apply the artificial neural network in a supervised manner to map out the quantum phase diagram of disordered topological superconductor in class DIII. Given the…