physics

Seigo Tarucha

Seigo Tarucha is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Seigo Tarucha rather than just read about it. In short: Seigo Tarucha (born 1953) is a Japanese experimental physicist who is known for his research on gate-defined semiconductor quantum dots and spin qubits. Biography Tarucha was born 1953 in Ehime Prefecture.

Key takeaways

Seigo Tarucha belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Seigo Tarucha to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Seigo Tarucha from memory before moving on to harder problems.

Reference excerpt

Seigo Tarucha (born 1953) is a Japanese experimental physicist who is known for his research on gate-defined semiconductor quantum dots and spin qubits.

Biography Tarucha was born 1953 in Ehime Prefecture. He studied Applied Physics at the University of Tokyo, where he obtained his BS in 1976, his MSc in 1978, and his PhD in 1986. In 1978 he joined NTT Basic Research Laboratories as Staff Member, becoming Senior Researcher (1985), Principal Researcher (1989), Group Leader (1990), and Distinguished Scientist (1994–1998) there. In 1998 he was appointed professor at the Department of Physics at the University of Tokyo and from 2004 to 2018 he was professor in the Department of Applied Physics at the same university. In 2013, he joined RIKEN, where he was named Division Director of the Quantum Information Electronics Division and Group Director of the Quantum Functional System Research Group, both at the RIKEN Center for Emergent Matter Science. Since 2018 he is also Deputy Director of this center and he also heads the Semiconductor Quantum Information Device Research Team (since 2020) and the Emergent Phenomena Observation Technology Research Team (since 2024). In his research, Tarucha has studied the quantum physics of GaAs and silicon nanostructures, in particular the transport through quantum dots and quantum dot molecules (including investigations of the Kondo effect with quantum dots) and their spin physics. His research contributed to establishing the basic control and measurement operations for these systems (controlled charging of the dots, single-shot spin measurement, microwave spectroscopy, coherent control using ESR and time-dependent gate voltages to modify the exchange coupling between neighboring quantum dots) and demonstrating the quantum dots atom- and molecule-like properties. Much of his work since the late 1990s addressed the potential use of electron spins in quantum dots as qubits for quantum information processing following the Loss-DiVincenzo proposal. Work in his group demonstrated among others electrically-driven single- and two-qubit quantum gates. More recently, his group demonstrated a quantum-dot spin qubit with a fidelity above 99.9% in 2018 and quantum error correction using a three-qubit code. According to Web of Science he has (as of 2024) co-authored over 500 research articles in peer-reviewed journals which were cited more than 24,000 times (h-index of 66). Among others, he is co-author of several highly cited review articles on the physics of few-electron gate-defined quantum dots.

Awards 2000 Ryogo Kubo Award 2002 Nishina Memorial Prize 2005 National Medal with Purple Ribbon 2007 Leo Esaki Prize 2017 Outstanding Achievement Award of the Japan Society of Applied Physics

References

External links "Homepage including brief CV". riken.jp.

Worked examples

Example 1 — a first encounter with Seigo Tarucha

Start with the simplest possible case. Write down what Seigo Tarucha claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Seigo Tarucha before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Seigo Tarucha ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Seigo Tarucha

In research: Seigo Tarucha appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Seigo Tarucha in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Seigo Tarucha is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1953 births, 20th-century Japanese physicists, 21st-century Japanese physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Seigo Tarucha outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Seigo Tarucha in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Seigo Tarucha means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Seigo Tarucha out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Seigo Tarucha in simple terms?

Seigo Tarucha (born 1953) is a Japanese experimental physicist who is known for his research on gate-defined semiconductor quantum dots and spin qubits. Biography Tarucha was born 1953 in Ehime Prefecture.

Why does Seigo Tarucha matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Seigo Tarucha?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Seigo Tarucha.