Prof. Alain Aspect
Université Paris-Saclay, France
The measurement was chosen while the photons were already in flight.
From Einstein and Bell to quantum technologies: entanglement in action
· National Taiwan University · Raymond Soong Chair Professorship of Distinguished Research
Einstein held that quantum mechanics was incomplete; Bell showed the dispute could be settled by experiment. Aspect made that measurement with pairs of entangled photons, switching the direction of measurement while the photons were in flight. From there he turns to quantum cryptography and quantum computing.
Full lecture
Two versions, side by side
Each laureate spoke twice: the formal lecture in Stockholm in the year of the award, and this one in Taiwan. Years apart, before a different audience, the account is not always the same. The pair repays watching together.
The Taiwan lecture
14 October 2024
National Taiwan University
Further up this page, ready to play.
The original Nobel Lecture
2022
Stockholm
The formal lecture from the prize year, on nobelprize.org, with video and transcript.
- One body of research; what each talk chose to include.
- From peers in Stockholm to students in Taiwan: how the telling changes.
- What has been revised between the prize year and now.
My notes
Learning area →A private notebook for this lecture. Everything you write stays in your own browser and is saved as you type. The fields follow the three stages set out in the learning area: write the question you want to ask before it (prepare), set down the argument once you have heard it (attend), then your own response and a further question (reflect).
This browser will not let the site keep anything, so what you write disappears when you leave the page. The usual causes are a private window or a setting that blocks site data. Copy anything you need first.
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1Prepare
Before the lecture: settle on this one, watch the guide and the original Nobel Lecture, and write the question you want to ask.
Look up whatever you do not know — the official citation on nobelprize.org, the laureate’s own institution, Wikipedia. An hour of background changes what the same fifty minutes is worth.
A question for the speaker These three are the judging criteria of the Into the Nobel question competition.- Depth: it reaches the trade-offs and limits behind the work.
- Logic: the question stands up, and its premise holds.
- Originality: the answer cannot simply be looked up.
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2Attend
While you listen or watch: note that you have seen the Taiwan lecture, and set down the argument in your own words.
The speaker’s core argument What the lecture argues — in your own words. -
3Reflect
Afterwards: your own response, and what you would still ask.
Your reflection What surprised you, what you disagree with, how it differs from the original Nobel Lecture.An extension question (at least one) Something the speaker would want to answer, and that cannot be looked up.
What you write stays in this browser and is never uploaded. It disappears if you switch machines or clear site data, so keep a copy of anything you need.
Notes are to be written by the student; how each field is written (typed, pasted or inserted automatically) is recorded alongside it and goes into the file exported from the learning area.
Watch next
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1 Nobel Prize in Physics, 2018 Prof. Gérard Mourou A laser pulse had to be stretched before it could be amplified. -
1 Nobel Prize in Physics, 2022 Prof. Alain Aspect The transistor and the laser were only the first quantum revolution. -
1 Nobel Prize in Chemistry, 2004 Prof. Aaron Ciechanover Most of the years a life has gained were added in the twentieth century.