David Jennings

Quantum Information Theorist. PsiQuantum. Also teaches at Imperial College London and University Leeds. Overuses the letter 'q'. Opinions my own.

[David Jennings @jenningsquantum]

Interested in magic states, CSS codes, and qubit upper+lower bounds on distillation rates via stat-mech mappings? Then see the recent super work done by Rhea Alexander, Nick Koukoulekidis and Si Chen, which is now published in PRX Quantum. Congrats all!! https://t.co/bh8MTg2FW1

[Sterling Crispin 🕊️ @sterlingcrispin]

Everyone's generating Ghibli's when you could be converting Ghibli films into the style of depression era photographer Dorothea Lange.

[Martin Bauer @martinmbauer]

DESI has made the largest 3D map of our Universe to date

Earth is at the center in this animation, each blue point is a galaxy: > 14 million galaxies in total up to 11 billion light years away

The gaps are the regions where our own galaxy blocks the view

[Claire Lamman @ClaireLamman]

DESI's DR2 BAO results are out!!
TL;DR... 1/n
@desisurvey

[Giuseppe Carleo @gppcarleo]

We provide a classical simulation of DWave quantum "s-word" paper.
Here it is https://t.co/5TjGVgS1AQ , great work by Linda Mauron @cqs_lab, check it out!

Our findings are in line with the other pre-print from @FlatironInst @MStoudenmire that just came out, but with a very different classical simulation technique (we use tdvp-jastrow states, whereas they use tree tensor networks.)

In a nutshell, if your classical ansatz is not entanglement-limited, you can simulate systems that were originally estimated to take around 200 years on the largest supercomputer available. We had to rush this out, because of ehmmm @MStoudenmire..., but in the next few days we will upload simulations up to the million years frontier of the Dwave paper.

[Daniel Litt @littmath]

In this thread I want to share some thoughts about the FrontierMath benchmark, on which, according to OpenAI, some frontier models are scoring ~20%. This is benchmark consisting of difficult math problems with numerical answers. What does it measure, and what doesn't it measure?

[Pete Shadbolt @PeteShadbolt]

Some members of our engineering team were (understandably) outraged when we laid out these ridiculous targets a few years ago. Privileged to work alongside brave and brilliant people who simply get on with the task at hand and execute

[horse dentist @equine__dentist]

yes google i was looking for the former prime minister’s height in picometers

[PsiQuantum @PsiQuantum]

Introducing Omega, the first manufacturable chipset for photonic quantum computing. Designed by PsiQuantum and manufactured at @GlobalFoundries, this chipset contains all the advanced photonic components required for million-qubit-scale quantum computers. https://t.co/qi4qxGKjw7

[John Preskill @preskill]

I have been encouraged to publish my talk at Q2B 2024. It's @arxiv today.
https://t.co/F53W3fvTGQ

[Dr Maria Violaris @maria__violaris]

I made a Quantum Physicist Reacts video for Microsoft's Majorana 1 chip!

00:00 Intro

01:11 Topological quantum computing

03:19 Comparison with Google's Willow chip

04:57 Decoding the announcements

08:36 The paper & peer-review reports

11:50 Past skepticism & retractions

13:55 Potential impact on quantum computing

15:49 Conclusion & Recap

[PsiQuantum @PsiQuantum]

. @DARPA has selected PsiQuantum for the final phase of the Utility-Scale Quantum Computing program evaluation. The Validation & Co-Design phase of the US2QC program, as part of the Quantum Benchmarking Initiative (QBI), marks a critical milestone on the roadmap to deliver an industrially useful quantum computer.  https://t.co/o3885IYXem

[sophie @netcapgirl]

“now it is our turn to study statistical mechanics”

[Martin Bauer @martinmbauer]

George R Martin and the physicist Ian Tregillis have published a paper where they construct a Lagrangian that can model the spread of the wild card virus

Goes to show both the power of the variational principle and how creative G.R.Martin has become in avoiding to finish writing winds of winter

[Ludovico Lami @LamiLudovico]

I have an opening for 3 ERC-funded postdoc positions in my group at SNS in Pisa. If you are fascinated by quantum resources, entanglement, and quantum Shannon theory, don’t hesitate to apply! Starting date ~Sept 2025, salary ~2,800 euros/month. Details below:

[PsiQuantum @PsiQuantum]

Exciting results in quantum chemistry published w/ @Boehringer brings us closer to calculating the exact electronic structure of Cytochrome P450 (drug metabolism) and FeMoco (fertilizer production) on a quantum computer, with >200X reduction in resources relative to state-of-the-art quantum algorithms. Read more: https://t.co/AZIupQsr3I

[Physics In History @PhysInHistory]

1950: A. Einstein's Letter to Erwin Schrödinger where he talks about the famous Schrödinger's cat thought experiment ��️

Dear Schrödinger,
You are the only contemporary physicist, besides Laue, who sees that one cannot get around the assumption of reality—if only one is honest. Most of them simply do not see what sort of risky game they are playing with reality—reality as something independent of what is experimentally established. They somehow believe that the quantum theory provides a description of reality, and even a complete description; this interpretation is, however, refuted, most elegantly by your system of radioactive atom + Geiger counter + amplifier + charge of gun powder + cat in a box, in which the ψ-function of the system contains the cat both alive and blown to bits. Is the state of the cat to be created only when a physicist investigates the situation at some definite time? Nobody really doubts that the presence or absence of the cat is something independent of the act of observation. But then the description by means of the ψ-function is certainly incomplete, and there must be a more complete description. If one wants to consider the quantum theory as final (in principle), then one must believe that a more complete description would be useless because there would be no laws for it. If that were so then physics could only claim the interest of shopkeepers and engineers; the whole thing would be a wretched bungle.

You are completely right to emphasize that the complete description cannot be built on the concept of acceleration, nor, it seems to me, can it be built on the particle concept. Only one of the tools of our trade remains—the field concept, but God knows whether this will stand firm. I think it is worthwhile to hold on to this, i.e. the continuum, as long as one has no really sound arguments against it.

But it seems certain to me that the fundamentally statistical character of the theory is simply a consequence of the incompleteness of the description. This says nothing about the deterministic character of the theory; that is a thoroughly nebulous concept anyway, so long as one does not know how much has to be given in order to determine the initial state.

It is rather rough to see that we are still in the stage of our swaddling clothes, and it is not surprising that the fellows struggle against admitting it.

Best regards!

Yours,
A. Einstein

[John Preskill @preskill]

Congratulations to all who contributed to the advances in quantum error correction recognized by the @PhysicsWorld Breakthrough of the Year.

https://t.co/YPlqt0xer6

[Alec Eickbusch @AEickbusch]

I'm happy to share one of two experimental quantum error correction preprints released today from our team at @GoogleQuantumAI , where we realize three time-dynamic implementations of the surface code! Check it out here: https://t.co/LQWxhKQ1rr

[Harry Zhou @hyharryzhou]

Our holiday gift this year from @QueraComputing is magic 🪄 We experimentally perform magic state distillation, a key building block of large-scale quantum computers, with distance 3 & 5 logical qubits on our newly built Gemini-class neutral atom computer. https://t.co/1sAYHlidVH

[John Preskill @preskill]

I created a transcript of my talk at the #Q2B Conference: "Beyond NISQ: The Megaquop Machine." You can read it here:

https://t.co/RdH2B7WW26