Category Archives: Uncategorised

This week an amazing result has been announced on the arXiv: a proof that the NPA hierarchy does not converge exactly at a finite level even in the CHSH scenario. This is something that I tried to prove myself but … Continue reading →

I’ve just read this essay by the famous mathematician Terence Tao together with an artist about the use of AI in mathematics. It’s well worth a read and very well-written. It focuses more on familiar territory of the problems caused … Continue reading →

The open access movement has taken over the world. Now pretty much every grant you get comes with an open access mandate, a requirement to publish the resulting papers in an openly accessible manner. It has also captured the public’s … Continue reading →

A friend of mine, Miguel Navascués, has just started a new science blog, which I’m happy to advertise here: https://sciencecommunicationexplained.blogspot.com/ His inaugural post, written in his signature incendiary style, is about a subject that has personally pissed him off: another … Continue reading →

A couple of years ago I was complaining about the lack of direct support for SDPs with complex numbers, and documenting my efforts to get it working on SeDuMi via YALMIP. That worked, but in the meantime I’ve stopped using … Continue reading →

An old friend of mine, Jacques Pienaar, wrote to me last Friday asking whether this paper by Wang et al. is bullshit, or is he going crazy. Don’t worry, Jacques, you’re fine. The paper is bullshit. It claims to experimentally … Continue reading →

If you have used the NPA hierarchy to bound a Tsirelson bound, and want to recover a state and projectors that reproduce the computed expectation values, life is easy. The authors provide a practical method to do so, just compute … Continue reading →

I’m happy to announce the 0.3 release of Ket.jl. This is a library to do quantum information and optimization in Julia; it is the second project I alluded to in my Julia post. The goal is to free the new … Continue reading →

My review about semidefinite programming was accepted by Reviews of Modern Physics. Great! After acceptance, nothing happens for three months. Then, the tragedy: we get the proofs. Now I understand what took them so long. It takes time to thoroughly … Continue reading →

I’ve just finished writing yet another referee report. It’s not fun. It’s duty. Which got me wondering: am I doing my part, or am I a parasite? I get much more referee requests than I have the time to do, … Continue reading →