physics

Sebastian Deffner

Sebastian Deffner 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 Sebastian Deffner rather than just read about it. In short: Sebastian Deffner is a German theoretical physicist and a professor in the Department of Physics at the University of Maryland, Baltimore County (UMBC). He is known for his contributions to the development of quantum thermodynamics with focus on the thermodynamics of quantum information, quantum speed limit for open systems, quantum control and shortcuts to adiabaticity.

Key takeaways

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

Reference excerpt

Sebastian Deffner is a German theoretical physicist and a professor in the Department of Physics at the University of Maryland, Baltimore County (UMBC). He is known for his contributions to the development of quantum thermodynamics with focus on the thermodynamics of quantum information, quantum speed limit for open systems, quantum control and shortcuts to adiabaticity.

Education Deffner received his Diplom-Physiker (Master of Science) in 2008 from the University of Augsburg; and he received his doctorate from the same university in 2011 under the supervision of Eric Lutz.

Career From 2008 until 2011, Deffner was a research fellow at the University of Augsburg. From 2011 to 2014, he was a Research Associate in the group of Christopher Jarzynski at the University of Maryland, College Park (UMD) for which he had received the DAAD postdoctoral fellowship. From 2014 to 2016, he took up the position of a Director’s Funded Postdoctoral Fellow with Wojciech H. Zurek at the Los Alamos National Laboratory. Since 2016, he has held a position as a faculty member of the Department of Physics at the University of Maryland, Baltimore County (UMBC), where he leads the quantum thermodynamics group, and a position as a Visiting Professor at the University of Campinas in Brazil.

Recognition Deffner’s contributions to quantum thermodynamics have been recognized through the 2016 Early Career Award from the New Journal of Physics, as well as the Leon Heller Postdoctoral Publication Prize from the Los Alamos National Laboratory in 2016. Since 2017, Deffner has been a member of the international editorial board for IOP Publishing's Journal of Physics Communications, and since 2019 he has been on the editorial advisory board of the Journal of Non-Equilibrium Thermodynamics, and a member of the Section Board for Quantum Information of Entropy. He is also a member of the inaugural editorial board of PRX Quantum.

2017 APS Outstanding Referee (American Physical Society). 2016 Leon Heller Postdoctoral Publication Prize (Los Alamos National Laboratory). 2016 Early Career Award (New Journal of Physics).

Personal life As of 2020, Deffner is married to Catherine Nakalembe, a remote sensing scientist. They have 2 children.

Worked examples

Example 1 — a first encounter with Sebastian Deffner

Start with the simplest possible case. Write down what Sebastian Deffner 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 Sebastian Deffner 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 Sebastian Deffner 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 Sebastian Deffner

In research: Sebastian Deffner 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 Sebastian Deffner 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: Sebastian Deffner is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1983 births, 21st-century German physicists, German theoretical physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Sebastian Deffner 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 Sebastian Deffner in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sebastian Deffner 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 Sebastian Deffner out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sebastian Deffner in simple terms?

Why does Sebastian Deffner 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 Sebastian Deffner?

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 Sebastian Deffner.