Toshinari Itoko
Collaborative Researcher
Japan
Summary
🤩
RockstarToshinari Itoko is a collaborative researcher and staff research scientist with 10+ years building algorithms and software to make quantum computers practical, currently affiliated with Keio University and IBM Quantum. He specializes in quantum circuit optimization and error characterization/mitigation, and is an active backend developer for Qiskit—contributing notable improvements to Qiskit Aer’s noise module and Pauli Hamiltonian evaluation. His background in classical optimization and diverse industry projects (from medical data analysis to industrial anomaly detection and manufacturing scheduling) informs a pragmatic approach to quantum-software design. Comfortable across Python, Java, and C++, he bridges theory, data analysis, and production-grade engineering. Less obvious: he applies lessons from large-scale classical optimization and domain-specific customer work to shape noise-aware transpiler passes and pulse-level features that tighten the gap between lab experiments and useful quantum applications.
10 years of coding experience
Github Skills (11)
circuit10
quantum-computing10
qiskit10
python10
simulator10
quantum-programming-language9
sdk9
develop8
compiler8
numpy8
optimization7
Programming languages (7)
Github contributions (5)
Qiskit/qiskit
Nov 2017 - Oct 2022
Qiskit is an open-source SDK for working with quantum computers at the level of extended quantum circuits, operators, and primitives.
Role in this project:
Back-end Developer & Quantum Computing Specialist
Back-end Developer & Quantum Computing SpecialistContributions:160 reviews, 23 commits, 47 PRs in 4 years 11 months
Contributions summary:Toshinari primarily focused on improving the evaluation of Pauli-list style Hamiltonians, indicating a strong involvement in the core computational aspects of the Qiskit framework. They addressed errors and refined the implementation of quantum circuit operations, specifically concerning optimization and mapping. Furthermore, the user contributed to the OpenPulse frontend, which includes new features for pulse schedule generation and Qobj conversion, revealing a focus on expanding Qiskit's capabilities in quantum control and experiment design.
pythonquantum-circuitsquantum-computingcircuitsquantum-circuit
Qiskit/qiskit-aer
Nov 2021 - Dec 2022
Aer is a high performance simulator for quantum circuits that includes noise models
Role in this project:Back-end Developer
Back-end DeveloperContributions:86 reviews, 15 commits, 17 PRs in 1 year
Contributions summary:Toshinari primarily focused on refactoring and modifying the noise module within the Qiskit Aer simulator. Their contributions involved changes to the core noise model, including replacing string-based qubit representations with tuples, adding transpiler passes for instruction-dependent noise, and modifying the handling of device parameters. They also addressed issues related to invalid T2 values from backends and fixed the computation of the excited state population.
quantum-circuitsquantum-computinggpucircuitsquantum-algorithms
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