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Jonathan Oppenheim

@postquantum.bsky.social

Quantum mechanic with a lot of ontological baggage. https://www.ucl.ac.uk/oppenheim/

223 Posts1774 Follower284 Folgt
Jonathan Oppenheim@postquantum.bsky.social · 2d ago

The path-integral formulation of the Postquantum theory of classical gravity is now in Physical Review X! Other results from our group have been published at the same time, so this is a good opportunity to review progress. ⚛️ 🧪https://superposer.substack.com/p/postquantum-gravity-new-results-and 1/2

Postquantum gravity: new results and the state of play (I)

A covariant path-integral formulation of the Postquantum theory of classical gravity (PQG) has just been published in Physical Review X, and a few other related papers have come at the same time.

superposer.substack.com

Jonathan Oppenheim@postquantum.bsky.social · 4mo ago

We invite applications for Research Fellow positions as part of a new initiative to be launched in late 2026 at the interface of quantum information theory and gravity! Please RT and let potentially interested researchers know. www.ucl.ac.uk/mathematical... 1/2

Opportunities

As part of a major new initiative at UCL, we will be recruiting postdocs and PhD students (for Oct 2026) and appointing at least three new academics over the next four years. Join us! Details below.

ucl.ac.uk

Jonathan Oppenheim@postquantum.bsky.social · 5mo ago

In late 2025, tools Like Claude Code crossed a threshold. Like hyperactive master's students, their physics calculations can now be made more reliable with domain expertise and some scaffolding. Check out Tobias Osborne's talk on using a swarm of agentic verifers to do physics.

Large Language Models -- A Physicist's Perspective

A seminar by Tobias Osborne on orchestrating a swarm of coding agents to work on physics problems

superposer.substack.com

John Preskill@preskill.bsky.social · 8mo ago

Every December since 2017, I've delivered a keynote at Q2B Silicon Valley, commenting on recent progress in quantum computing. Here is what I said this time. It's been a good year for quantum. quantumfrontiers.com/2025/12/26/q...

Quantum computing in the second quantum century

On December 10, I gave a keynote address at the Q2B 2025 Conference in Silicon Valley. This is a transcript of my remarks. The slides I presented are here. The first century We are nearing the end …

quantumfrontiers.com

Dulwich Quantum Computing@dulwichquantum.bsky.social · 8mo ago

"A single person claims to have authored 113 academic papers on artificial intelligence this year, 89 of which will be presented this week at one of the world’s leading conference on AI and machine learning," www.theguardian.com/technology/2...

Artificial intelligence research has a slop problem, academics say: ‘It’s a mess’

AI research in question as author claims to have written over 100 papers on AI that one expert calls a ‘disaster’

theguardian.com

Jonathan Oppenheim@postquantum.bsky.social · 9mo ago

Great article on quadratic gravity, and why researchers are attracted to it (it's renormalisable). The pure gravity action of postquantum-classical gravity is the same us that of quadratic gravity but with a different interpretation, and it doesn't suffer from ghosts! arxiv.org/abs/2402.17844 ⚛️🧪

Renormalisation of postquantum-classical gravity

One of the obstacles to reconciling quantum theory with general relativity, is constructing a theory which is both consistent with observation, and and gives finite answers at high energy, so that the...

arxiv.org

Quanta Magazine@quantamagazine.org · 9mo ago

In a theory called quadratic gravity, “ghost” particles violate physicists’ intuition of quantum fields. This made the theory unpopular for decades. Now, it’s experiencing a resurgence. @walkingthedot.bsky.social reports: www.quantamagazine.org/old-ghost-th...

Jonathan Oppenheim@postquantum.bsky.social · 9mo ago

A recent @nature.com article claims that classical (unquantised) gravity produces entanglement. We show that their model does not produce entanglement. Even if the model produced entanglement, it would be mediated by the quantised matter interaction, and not gravity. scirate.com/arxiv/2511.0... 🧪⚛️

Classical gravity cannot mediate entanglement

In Nature, 646, 813 (2025), Aziz and Howl claim that classical (unquantised) gravity produces entanglement. We show that their model does not produce entanglement. Even if the model produced entanglem...

scirate.com

Jonathan Oppenheim@postquantum.bsky.social · 10mo ago

What if the measurement problem isn't about explaining how the classical world emerges from the quantum world... ...but about what happens when quantum systems interact with something that's already classical? Turns out, the collapse postulate + Born rule emerge! scirate.com/arxiv/2510.0... 🧪⚛️🧵1/5

A one-world interpretation of quantum mechanics

The measurement problem is the issue of explaining how the objective classical world emerges from a quantum one. Here we take a different approach. We assume that there is an objective classical syste...

scirate.com

Jonathan Oppenheim@postquantum.bsky.social · 10mo ago

Maite Arcos's PhD results are hitting the arxiv! A resource theory of gambling, and a paper on adversarial thermodynamics are out today. Gambling provides an operational way to quantify who has more information. And it can be extended into the quantum domain!🧵🧪⚛️ 1/

Maite Arcos (left), Charlie Bennett (center), Lluis Masanes (right)
Jonathan Oppenheim@postquantum.bsky.social · 11mo ago

The CERN whitepaper, on testing the quantum nature of gravity, has even more co-authors and is now available on the arxiv, scirate.com/arxiv/2509.0.... Check it out! 🧪⚛️

A Spin-Based Pathway to Testing the Quantum Nature of Gravity

A key open problem in physics is the correct way to combine gravity (described by general relativity) with everything else (described by quantum mechanics). This problem suggests that general relativi...

scirate.com