QunaSys Inc.
@QunaSys_en
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We're an algorithm/software development company for quantum computing, with the strong focus on material simulation. Our Website: https://t.co/NP3xNqXWMW
Bunkyo-ku, Tokyo, Japan
Joined August 2020
Big News!🎉 We are proud to announce that we have raised $10M in Series B funding, to expand overseas markets further as a japan-based quantum computer software startup. Learn more about this capital and our plan here: https://t.co/sUDJVueiho
#QuantumComputing
prnewswire.com
/PRNewswire/ -- QunaSys Inc. ("QunaSys"), one of the world's leading developers of innovative algorithms in chemistry focused on accelerating the development...
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【New preprint🎉】 We proved that simulating the hardware-efficient ansatzes (HEA), widely used in near-term algorithms, belongs to the class known as BQP-complete. This result strongly suggests that such simulations are classically intractable. https://t.co/olwMyJmxLA
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【New preprint🎉】 Our joint work with Fujii Lab (UOsaka) on a new FTQC architecture “MB-FTQC”! Measurement-based approach aiming for large-scale QC on near-term devices, with new schemes like “higher-order zero-level magic state distillation.” https://t.co/uGOCHj8NVx
arxiv.org
We propose a measurement-based FTQC (MB-FTQC) architecture for high-connectivity platforms such as trapped ions and neutral atoms. The key idea is to use verified logical ancillas combined with...
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[New preprint on arXiv 🎉] We have posted a paper proposing a quantum algorithm for nonlinear plasma fluid simulation and its numerical verification. The method yields ~4th-order speedup in time scaling with grid size and polylog space complexity. https://t.co/0jcEGZMyAI
arxiv.org
To simulate plasma phenomena, large-scale computational resources have been employed in developing high-precision and high-resolution plasma simulations. One of the main obstacles in plasma...
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This is a step forward in showing how quantum computing and AI together can accelerate the future of drug discovery.
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Why this matters: The chemical space for potential drugs is unimaginably vast. By bringing quantum-inspired generative models into the process, we can more efficiently explore this space and align generated molecules with real-world pharmaceutical requirements.
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We present QCA-MolGAN – a novel framework that combines: A Quantum Circuit Born Machine (QCBM) to enhance generative AI; A Generative Adversarial Network (GAN) to design new molecules; A multi-agent reinforcement learning system to guide molecules toward key properties.
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[New preprint 🎉] We’re excited to announce that our team has published new research on quantum computing for drug discovery! https://t.co/QC137EbcwL
arxiv.org
Navigating the vast chemical space of molecular structures to design novel drug molecules with desired target properties remains a central challenge in drug discovery. Recent advances in...
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【New preprint🎉】 We have posted a new paper on the quantum state simulation with a limited number of T gates, looking ahead the early-FTQC era.
arxiv.org
Recent advances in quantum hardware are bringing fault-tolerant quantum computing (FTQC) closer to reality. In the early stage of FTQC, however, the numbers of available logical qubits and...
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[New preprint 🎉] We have posted a preprint proposing a way to realize quantum many-body scar states, which are intriguing nonthermal states, as a stable phase of nonequilibrium steady states. https://t.co/R5ESJ6b5RG
arxiv.org
We introduce a novel non-equilibrium phase -- the quantum many-body scar (QMBS) phase -- that emerges in non-Hermitian many-body dynamics when scarred wavefunctions are selectively stabilized via...
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[Paper published 🎉] Our paper on estimating Clifford+T gate decomposition error has been published in Quantum. This work can lead to the efficient use of early fault-tolerant quantum computers. https://t.co/BkBeaBv9D9
quantum-journal.org
Kohdai Kuroiwa and Yuya O. Nakagawa, Quantum 9, 1800 (2025). Fault-tolerant quantum computation (FTQC) is essential to implement quantum algorithms in a noise-resilient way, and thus to enjoy...
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We adopted a recently proposed powerful algorithm called generalized quantum signal processing (GQSP), and showed that it offers significant advantages over previous implementations in terms of computational cost and accuracy.
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[New preprint🎉] We have posted a new paper on the realization of various power iteration methods for numerically solving eigenvalue problems on quantum computers, based on joint research led by UOsaka in collaboration with UTokyo.
arxiv.org
We present a unifying framework for quantum power-method-based algorithms through the lens of generalized quantum signal processing (GQSP): we apply GQSP to realize quantum analogues of classical...
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Fluid dynamics simulation is a promising application for quantum computing, and we are actively working on it. We've just published a blog post on the work led by our intern Ueno, demonstrating the quantum circuit implementations for fluid dynamics. https://t.co/FksNKRXHxQ
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【Objective insights for quantum computing adoption】 QunaSys has released the preview of “QURI Bench” — a benchmarking tool to evaluate quantum hardware for enterprise R&D and DX teams. Helping you choose the right hardware & accelerate development. https://t.co/LeMj8z7s0J
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By applying this method to the excited states of aromatic molecules such as naphthalene and tetracene, we demonstrated on IBM quantum hardware that extending the configuration space can effectively compensate for quantum noise and improve computational accuracy.
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《New preprint 🎉》 In collaboration with Toyota Central R&D Labs., Inc., we have published a paper on a computational method called "QSCI-PT," which applies multireference perturbation theory (MRPT) on quantum-selected electron configurations (QSCI). https://t.co/Fn2i4Erg46
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Paper out! We prove worst-case classical hardness of sampling from unitary cluster Jastrow circuit, which automatically proves hardness for well-known UCC families. Congrats Hafid-san, Iwakiri-san, Kohda-san, and Kento for important step for QSCI/SQD! https://t.co/zlYdSDTCjS
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This result serves as a foundational step toward establishing quantum advantage for sampling-based algorithms, such as quantum selected configuration interaction (QSCI).
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《New preprint 🎉》 We’ve shown the classical hardness of simulating the sampling task from an ansatz state used in quantum chemistry and physics calculations on quantum computers, based on a widely accepted complexity-theoretic assumption. https://t.co/SbQBrg8tv2
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While our previous study using VQE was limited to only 2 bands, our QSCI approach successfully enabled calculations involving 8 bands using 16 qubits. https://t.co/GJAR6XhqFe
arxiv.org
Quasiparticle band structures are fundamental for understanding strongly correlated electron systems. While solving these structures accurately on classical computers is challenging, quantum...
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