Nobel Prize in Physics 2025

https://www.nobelprize.org/prizes/physics/2025/popular-information/

by luisb • 10 months ago

476 85 10 months ago

https://www.bbc.com/news/articles/c98d00nq47jo

Intermernet2• 10 months ago

I remember being introduced to this research when reading a weird paper on the unexpected efficiency of photosynthesis, but now I can't find that paper. Anyone got any hints?

SiempreViernes2• 10 months ago

For the papers about their measurements, you can look at the references in the technical press release https://www.nobelprize.org/uploads/2025/10/advanced-physicsp...

Can't help you with "a weird paper on the unexpected efficiency of photosynthesis", try asking a biologist at your local university, or possibly an organic chemist.

Intermernet2• 10 months ago

Yeah, I looked at Google Scholar to try and find cross-references to anything to do with photosynthesis and came up empty-handed. Annoying because I've been telling people about these guys for years, but can't find the original paper that introduced me to them!

jcynix• 10 months ago

Maybe you can find the paper you ate looking for starting here? https://newscenter.lbl.gov/2025/07/08/how-plants-manage-ligh...

Tip: this page links to further reading of older stuff.

handscarlsen• 10 months ago

why annoy credible scientists when there is an AI underlord available. Unexpected Quantum Efficiency of Photosynthesis: cite papers -->perplexity.ai

hints galore.

bookofjoe• 10 months ago

Quantum efficiency of photosynthetic energy conversion [1977]

https://pmc.ncbi.nlm.nih.gov/articles/PMC431568/

Evidence for wavelike energy transfer through quantum coherence in photosynthetic systems [2007]

https://www.nature.com/articles/nature05678

Explaining the Efficiency of Photosynthesis: Quantum Uncertainty or Classical Vibrations? [2022]

https://pubs.acs.org/doi/10.1021/acs.jpclett.2c00538

Reassessing the role and lifetime of Qx in the energy transfer dynamics of chlorophyll a [2025]

https://pubs.rsc.org/en/content/articlelanding/2025/sc/d4sc0...

Full microscopic simulations uncover persistent quantum effects in primary photosynthesis [2025]

https://www.science.org/doi/10.1126/sciadv.ady6751

dataviz10002• 10 months ago

Michel H. Devoret, Chief Scientist at Google Quantum AI, and in April 2020 John M. Martinis resigned from Google after being reassigned to an advisory role. [0]

Sounds like there was some politics shenanigans between them where Martinis was moved into a useless role and took the hint at the height of covid lockdown.

[0] https://en.wikipedia.org/wiki/Michel_Devoret

ctenb• 10 months ago

You linked the wrong article

dataviz10002• 10 months ago

He left because the reorg stripped his hardware decision authority, and he wouldn’t stay without control to drive the technical plan.[0]

He kept working on the problem. The question now looking back over 6 years is did Google make a mistake. I've seen this at IBM and other large research divisions where people who did something significant 20 or 30 years in fields like AI become stagnant burning tens and hundreds of millions. There was a political battle and Martinis got pushed out. The question I have is did the people who pushed him out know the path forward in quantum computing or did they just know how to play office politics licking the correct behinds.

[0] https://www.forbes.com/sites/moorinsights/2020/04/30/googles...

Metacelsus2• 10 months ago

This award involved some clever engineering to set up quantum effects in a macroscopic system, but was there any new physics involved here?

(Still better than last year's award which wasn't really physics at all!)

SiempreViernes2• 10 months ago

They discovered that the theory worked in a regime it hadn't been tested before; I'm not sure what "new physics" means in your sentence: it is a core assumption of physics that it's rules are always true, that all physics has always existed.

averne_• 10 months ago

New physics in this context means previously unknown effects or mechanisms, or even a new theory/framework for an already understood phenomenon. Using "physics" in this way is common amongst academics.

geremiiah• 10 months ago

Comments like these make me realize most people have no clue what science is really like.

bananaflag• 10 months ago

I don't think so, I just think they expect that Nobel Prize level physics should feel less incremental, and everything that doesn't involve a revolution in physics (like supersymmetry) or at least an expected confirmation of an old revolution (like the Higgs boson or gravitational waves) feels incremental.

wslh• 10 months ago

Great experiments are an essential part of physics.

dkural• 10 months ago

From that viewpoint of all of chemistry and biology is just a consequence of theoretical physics. A lot of the 'consequences' of physics are very surprising and not at all obvious from the fundamental equations. There's a great paper you might want to read:

https://www.tkm.kit.edu/downloads/TKM1_2011_more_is_differen...

He also won a Nobel by the way.

Many great discoveries follow from new instrumentation leading to better and novel data, and less often some conceptual leap. This is why the genius of Einstein is all the more remarkable in coming up with relativity. Interestingly, he got his Nobel for something else :)

Metacelsus2• 10 months ago

Thanks, this context helped.

Roark66• 10 months ago

Exactly, also in it's goal to "demonstrate quantum tunneling macroscopically" haven't we had tunneling diodes for quite a while? The device uses tunneling for its basic functionality

NetMageSCW• 10 months ago

In those cases doesn’t the tunneling occur one electron at a time, and so not macroscopic?

IAmBroom3• 10 months ago

I thought this too, at first. Then I read the article, and discovered it was about more than Josephson gaps and Schottky diodes.

EvgeniyZh• 10 months ago

It's highly non-trivial claim that macroscopic system can have quantized energy levels and exhibit measurable quantum effects. You can't just solve Shroedinger equation of 10^24 particles to show that.

whatshisface2• 10 months ago

That is what BCS theory does.

Romario77• 10 months ago

This could be one of the building blocks of quantum computing. You can have a macro system behave in quantum way.

This is a practical implementation of something that was only theoretically possible or observed on very small scale.

cyberax• 10 months ago

This award involved some clever engineering to set up quantum effects in a macroscopic system, but was there any new physics involved here?

There's a tradition of Nobel Prizes awarded for clever experiments, even if they do not uncover new fundamental laws.

chrysander2• 10 months ago

More than deserved!

Both Devoret and Martinis are also highly involved in pushing quantum engineering to new levels - Devoret at Google Quantum AI and Martinis (formerly at Google) with his company, Qolab.

Coincidentally, I have a close friend doing his PhD with Devoret and know someone working with Martinis. I am curious to see if they will ever see their respective supervisors again, given that the Nobel Prize attention will likely garner them countless invitations for talks and keynotes...

whizzter• 10 months ago

Invitations is one thing I think they can mostly pick on their own volition with one exception.

The prize rules stipulate that they need to hold one lecture related to their winning topic with the institution that picked the winner within 6 months.

Iirc the 2024 physics prize lecture (on the roots of neural networks) was held in the days just before the prize giving ceremony and can be watched on the Swedish broadcasters "education" channel as well as youtube.

https://urplay.se/program/239905-nobelforelasningar-2024-geo...

https://www.youtube.com/watch?v=XDE9DjpcSdI

correlator• 10 months ago

Definitely agree! It's just strange seeing Devoret without Schoelkopf!

chrysander2• 10 months ago

And Girvin as the third one of their Yale effort!

uncletoxa2• 10 months ago

Fred Ramsdell was among those honored Monday with a 2025 Nobel Prize in Medicine, but he's currently "living his best life" on an "off the grid" hiking foray https://www.france24.com/en/live-news/20251006-unreachable-n...

uncletoxa2• 10 months ago

Oops, that was a wrong thread. That's another nonbl prize nomination.

blenderob• 10 months ago

Great to see the University of California, Berkeley and the University of Cambridge, UK continuing to add to their already outstanding number of Nobel laureate alumni.

The Paris-Sud University was a new name to me. Apparently, this will be the 4th Nobel laureate associated with the university.

numid_mobile• 10 months ago

French higher education institutions work in very different ways from the standard US model; two relevant caracteristics are: a) good institutions for education and for research might not be the same at all and b) institutions work in a much more networked ways, so many labs will be joint ventures between like 5 universities/schools and 3 national research centres, students might get three degrees with each of them being a joint program between several schools.

So it's hard to have a good grasp.

andrewflnr• 10 months ago

good institutions for education and for research might not be the same at all

I'm pretty sure this is true in the US, too. Maybe we're just a little more delusional about it here.

jebarker2• 10 months ago

For those looking for a good pop-sci introduction to these sort of quantum effects and why demonstrating macroscopic quantum effects is a big deal for the foundations of the field I recommend “Through Two Doors at Once” by Anil Ananthaswany.

m3kw9• 10 months ago

Is this inferring to the double slit experiment?

jebarker2• 10 months ago

Yes

Awesomedonut• 10 months ago

Thanks!

osnium1232• 10 months ago

I spent time in UCSB’s physics department and Prof. Martinis was one of those experimental physicists who knew more about electronics and measurements than the typical electrical engineer. He used to have a wiki page containing documentation, cad files, etc of circuits that his group developed for his measurements and he also had open source software for controlling electronics. Very cool prize and happy to see UCSB getting one more Nobel prize!

zippyman55• 10 months ago

Let’s hear it for UCSB’s physics dept!

osnium1232• 10 months ago

It’s arguably one of the top five physics departments in the US.

chermi3• 10 months ago

Hey guys, I learned electronics from a nobel laureate!

Throughout my physics career including PhD, analog electronics was the most difficult but probably also the most rewarding class to me. I fondly remember staying until 2am in broida at ucsb trying to get a filter to work, getting a few hours sleep, then being back in the lab before sunrise. Of course, this was mostly the result of procrastination, but damn were those good times.

One thing that really bothered me then was the idea of a current source. I was perfectly happy with a voltage source, perhaps naively(1). But a current source seemed magical. I was asking Martinis about this and he seemed dumbfounded that I didn't understand. Of course, the answer is feedback. And, of course, good voltage sources also require feedback. But he was so familiar with feedback control he didn't even consider saying that's whats happening, while I never even heard of controls.

Long story short, sometime later I asked to join his lab as an undergrad researcher. He said no, and to this day I think it's because I didn't understand current sources. Or maybe I was too late, or maybe the A- (see the aforementioned procrastination). That led me to asking a biophysicist, and therefore I became a biophysicist instead of condensed matter/QI/QC. In hindsight, I think this was fortunate. I would've never considered biophysics, which has been one of the loves of my life since then. Who knows, maybe I would've been just as happy with quantum stuff. I'm working through Mike and ike now and find it fascinating.

Funny enough, after my PhD, I co-founded a startup in industrial control & automation. Now I understand feedback quite well, and thus current sources, albeit many years too late.

(1) Of course, good voltage sources vary their resistance just like good current sources vary their voltage. My best guess as to the reason I was more bothered by the current sources is that I was so familiar with voltage sources with confidently claimed constant voltages (batteries). Not a very good reason, I should've questioned it more. In practice, it's much easier to make a near ideal voltage source (very high resistance) than a near ideal current source (0 resistance).

henearkr• 10 months ago

Interesting, this constant current source notion.

For a design without feedback, and in an energetically inefficient way, maybe this can work too:

1. Determine what will be the maximum resistance of the "current consumer" part of your circuit throughout its operation.

2. Prepare a resistor several magnitudes larger than the resistance above.

3. Connect to the resistor above a (huge) voltage source so that the resulting current is the one you target for your current source

4. Put the "current consumer" part of your circuit in series with the large resistor.

nyeah3• 10 months ago

It works. In most applications it would be wasteful of electrical power (and money). You have to generate this very large voltage that (it turns out) you don't really need.

On the other hand that circuit is very easy to understand and build and test.

dgfl2• 10 months ago

This is pretty much what we do to apply small bias currents to our superconducting circuits. The signals are small (<1 uA), and the power is dissipated outside of the cryostat, so this method is very simple and effective. The voltage and resistors don’t even need to be that huge, ~10 MOhm or below, and correspondingly, <10 V.

Workaccount2• 10 months ago

Ideal current sources would also be pretty terrifying. Set it to even a "measly" 50mA and go poke someone with the output...

ridgeguy• 10 months ago

No need to poke somebody. Just turning it on would cause it to ramp up until air breakdown at the output electrodes, where you'd have a 50mA plasma!

nyeah3• 10 months ago

"Of course, good voltage sources vary their resistance just like good current sources vary their voltage. "

Did you mean to say "good voltage sources vary their current just like good current sources vary their voltage"?

(I know nobody really cares, and I promise I'll seek help for whatever neurological condition I seem to have.)

lisper2• 10 months ago

There are two different ways to produce a voltage source. The first is to put a variable resistor in series with the power source, which you can adjust to control the voltage. This works, but dissipates a lot of heat. The second is to put a switch in series with the power source and a capacitor in parallel with the load, then switch the power source on and off very rapidly and use the duty cycle to control the voltage. This is how modern switching power supplies work. In actual practice, there are also inductors in the circuit which cause resonance, and allow the switching to happen when there is no current flowing through the switch. This is how modern switching power supplies can be so efficient.

chermi3• 10 months ago

Oops, meant "understand feedback quite well*", can't edit for some reason?

godelski• 10 months ago

FYI, I think the time limit for editing is 1hr. It might change if someone replies? I'm not sure that these rules are written down anywhere.

@Dang, if you see this can we add to the FAQ?

There's also a delay setting in your profile that delays the message but has a max of 10 minutes. There's also the noprocrast setting to help reduce procrastination. The default values let you in for 20 minutes at a time and don't allow you back in for 180 minutes.

dang• 10 months ago

I did a s/while/well in there. Hope that's ok.

All: you are welcome to email hn@ycombinator.com if you need something like this after the editing window has passed

derangedHorse• 10 months ago

It's best not to assume the motives behind a rejection unless they align with things you already see as shortcomings. Doing so might cause you to over-correct on things that weren't problems. Being incorrect in a discussion or getting an A- in a class doesn't seem like things that would completely turn a professor off from accepting you.

eric15342335• 10 months ago

correlation is not causation

everdrive2• 10 months ago

Dumb question:

"We know that the ball will bounce back every time it is thrown at a wall. A single particle, however, will sometimes pass straight through an equivalent barrier in its microscopic world and appear on the other side. This quantum mechanical phenomenon is called tunnelling."

Is the particle just failing to collide with the wall since objects are mostly empty space? Or is something more spooky or interesting happening?

kitchi• 10 months ago

In quantum mechanics, the "ball" (or in this case an ideal particle) has a "wave function" associated with it. This wave function effectively describes the probability that the particle can be at a certain location.

It so happens that when you solve for this problem, a ball bouncing against a wall, in this wave function paradigm then you end up with a non-zero probability that the ball appears on the other side of the wall.

I'm not sure if there is a deeper explanation at play here but that's how I understand it.

bluesummers5651• 10 months ago

The simplest version of this problem involves a "potential barrier." Another loose classical analogy here is considering a ball rolling towards a hill. Everyone knows from experience in classical systems that with sufficient speed i.e. kinetic energy, the ball can go over the hill i.e. there is more kinetic energy in the ball when it meets the bottom of the hill than there is potential energy the ball would have at the top of the hill. If it has less energy, it will not make it past the hill. The weird thing about the analogous situation in quantum mechanics is that even if the particle has less energy than the potential barrier (the hill), it has a non-zero probability of being on the other side due to the wave function exponentially decaying in the barrier.

RigelKentaurus• 10 months ago

As far as I know, the "single particle" referred to here is not a "classical particle" like a ball. It's a "quantum object" that, depending on how you look at it, behaves like a wave or an object. Definitely spooky!

sbenerofe2• 10 months ago

Not a dumb question at all.

The idea that a particle could pass through a wall by luckily avoiding collisions is a classical way of thinking. In that view, a particle is a tiny solid ball and a wall is just a collection of other tiny balls with space between them.

Quantum tunneling is based on a completely different concept. In quantum mechanics, the "wall" is not a physical object but a high energy barrier. Classically, a particle cannot be in a region if it doesn't have enough energy to overcome that barrier (this is why people often use the idea of a high wall and a ball that cannot make it over the wall). However, quantum mechanics treats particles as having wave-like properties. This wave is related to the probability of finding the particle at any given location. While the probability of finding the particle inside the high-energy barrier is very low, it is not zero. The wave's amplitude shrinks inside the barrier, but a small portion of it extends to the other side. This means there is a small but finite probability that if you measure the particle's position, you will find it on the other side. When that happens, we say the particle has "tunneled" through.

The surprising success of the experiments that led to the Nobel Prize today is that it wasn’t just a single particle (like an electron) that they measured tunneling through a barrier, it was a macroscopic group of particles. These particles were able to tunnel through the barrier because they were kept in a coherent state that allowed them to have a wave function that coherently extended through the barrier. This meant that they had a reasonable finite amplitude on the other side of the barrier so that a measurement could show that they tunneled through the barrier.

everdrive2• 10 months ago

Thanks, I'm still thinking about your answer but really appreciate your explanation. Would this mean that there is some (possibly currently unknown) maximum size for a group of particles that could be forced to maintain the correct state to pass through the wall?

wavemode• 10 months ago

Does a denser wall produce a higher-energy barrier?

And, if so, is there then actually a practical difference between the classical and quantum interpretations? (i.e. could it simply be said that, the denser wall just has more chances to collide with the particle and stop it from passing through, thus explaining why the probability of finding it on the other side is lower?)

cvoss• 10 months ago

It's more spooky and interesting. When we switch to discussing the single particle case, the "wall" is a metaphor. You have a single particle in a low energy state at position A. There is another low energy state at position C, but the path from A to C entails (ostensibly) passing through an intermediate high energy state at position B. Without lending energy into the system, you wouldn't expect the particle to be able to move from A to C, because the particle needs a lot of energy temporarily to move from A to B (which it would give up again as it moves from B to C). Yet the particle does move from A to C, in the absence of an energy source that could explain what happened. This raises the spooky question: Did it actually pass through B on its way? It seems like it did not.

whatshisface2• 10 months ago

Here is a one-sentence answer: Tunneling is due to incomplete reflection at a boundary mathematically akin to seeing out of your window.

IAmBroom3• 10 months ago

Loads of good responses, but I'll just add:

Is the particle just failing to collide with the wall since objects are mostly empty space?

To be frank, essentially nothing macroscopic ever reacts to impact because (subatomic) particles physically hit particles. Electrons repel with significant force long before they can "collide". The volume of space represented by "close enough" to the outermost electron shell (since electrons aren't at one single volume at any one moment in time) is somewhat large, even if the volumes of the nucleus + the sum of all electrons in the atom are much less.

jonathan_ds• 10 months ago

"Quantum properties on a human scale" the news and the new age mystics will have a field day with this one

nritchie• 10 months ago

It is worth noting that the research that Martinis is being awarded the Nobel prize was largely performed while at NIST (National Institute of Standards and Technology), part of the Dept of Commerce.

fraserphysics• 10 months ago

I read the NY Times article about this earlier this morning. I thought it was not very good. I came to HN to see if it had something better. It did. The linked article is also at something like a high school level, but it gave me (retired PhD Physics) a good idea of the experiment and the theory. Thanks.

giardini• 10 months ago

So is ball lightning a quantum phenomenon?

Tewboo• 10 months ago

Always exciting to see what groundbreaking discoveries the Nobel Physics Prize will honor this year. Can't wait to learn about the latest advancements!

cinquemb• 10 months ago

Very exciting.

Devoret was my co-authors phd advisor (and who is also my advisor now on some of my work).

We sorely need more open quantum systems built/designed with open source tooling. The IBM's, Ionq's, Quantinuum's and Googles, will be happy if we all remain serfs to their multimillion dollar machines and hardware direction.

erikhansenwong• 10 months ago

John Clarke is the father of Liz, one of my close friends from college. Liz and I were physics undergrads at Berkeley and her father was a professor there. Thanks to HN I had the pleasure of being the first one to tell her that her dad had just won the Nobel Prize (I saw the news before she woke up, due to time zone differences). I wish I could post photos here, she sent me a beautiful picture of him filled with joy as he received a free parking pass from Berkeley with the expiration date "NEVER" later that afternoon :-D

queuebert• 10 months ago

This is a weird story. If I were the dad, I would've preferred to tell my daughter myself. And a Nobel winner being overjoyed to get a free parking pass is borderline dystopian.

t0lo• 10 months ago

It's just inner city life- it's a big deal in the real world

scoopertrooper• 10 months ago

He’s also getting about a million dollars from the Nobel committee.

tyre• 10 months ago

Berkeley gives dedicated parking spots to Nobel laureates. It’s not about having a place to park. It’s about being in the same category as all of those greats.

bicepjai• 10 months ago

So much human behavior unfolding in this short fun story

multiversenow• 10 months ago

Looks like they've gone back to giving it to physicists instead of AI researchers.

Nobel Prize in Physics 2025

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