physics

Stephanie Wehner

Stephanie Wehner 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 Stephanie Wehner rather than just read about it. In short: Stephanie Dorothea Christine Wehner (born 8 May 1977 in Würzburg) is a German physicist and computer scientist. She is director and co-founder of the European Quantum Internet Alliance, a Professor at QuTech, Delft University of Technology. and a member of the Royal Netherlands Academy of Arts and Sciences.

Key takeaways

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

Reference excerpt

Stephanie Dorothea Christine Wehner (born 8 May 1977 in Würzburg) is a German physicist and computer scientist. She is director and co-founder of the European Quantum Internet Alliance, a Professor at QuTech, Delft University of Technology. and a member of the Royal Netherlands Academy of Arts and Sciences.

Education and early life She studied at the University of Amsterdam and obtained her Ph.D. at CWI. Following this she moved to Caltech as a postdoctoral researcher (under John Preskill). Wehner was involved in computer security, for example kernel rootkits, and worked as a professional hacker.

Career From 2010 to 2014, Wehner was an assistant professor and later associate professor at the department of computer science at the National University of Singapore and a Principal Investigator at the Centre for Quantum Technologies. In 2014, she started as associate professor at QuTech, Delft University of Technology and as of 2016 she is Antoni van Leeuwenhoek professor at the Delft University of Technology.

Research Wehner's research extends over a broad spectrum of information processing in quantum mechanical systems, with a special focus on quantum cryptography, quantum communications and quantum networking. In quantum cryptography, she is best known for introducing the noisy-storage model in quantum cryptography. Wehner's research focuses mainly on quantum cryptography and quantum communications. In quantum networking, Wehner made fundamental contributions to shaping the field, including setting forth a vision for the road ahead. She has developed the first link layer for quantum networks, as well as the first operating system that allows programming quantum network applications and executing them on quantum network nodes. Wehner has also worked on using the perspective of information processing to understand physics. Together with Jonathan Oppenheim, she discovered that the amount of non-locality in quantum mechanics is limited by the uncertainty principle.

QCRYPT conference In 2011, Wehner and Matthias Christandl founded the QCRYPT conference series. QCrypt is held once a year, with a location rotating between Europe, Asia and America.

Quantum Internet Alliance Stephanie Wehner is the director and co-founder of the Quantum Internet Alliance, a European initiative founded in 2017 with the goal to build a prototype Quantum Internet. Currently, the Quantum Internet Alliance is supported by the European Commission via a Framework Partnership Agreement.

Publications Her publications include:

Oppenheim, Jonathan, and Stephanie Wehner. "The uncertainty principle determines the nonlocality of quantum mechanics." Science 330.6007 (2010): 1072–1074. Hensen, Bas, et al. "Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres." Nature 526.7575 (2015): 682.

Awards Wehner received the Ammodo Science Award in 2019. In 2022 she was elected to the Royal Netherlands Academy of Arts and Sciences. In 2025, she was awarded the Körber European Science Prize.

References

Worked examples

Example 1 — a first encounter with Stephanie Wehner

Start with the simplest possible case. Write down what Stephanie Wehner 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 Stephanie Wehner 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 Stephanie Wehner 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 Stephanie Wehner

In research: Stephanie Wehner 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 Stephanie Wehner 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: Stephanie Wehner is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1977 births, 21st-century German physicists, 21st-century German women physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Stephanie Wehner 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Stephanie Wehner” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Stephanie Wehner in 20 minutes

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

Frequently asked questions

What is Stephanie Wehner in simple terms?

Why does Stephanie Wehner 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 Stephanie Wehner?

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 Stephanie Wehner.