Author Archives: Mateus Araújo

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 →

I’ve just been to the amazing Quantum Redemption conference in Sweden, organized by my friend Armin Tavakoli. I had a great time, attended plenty of interesting talks, and had plenty of productive discussions outside the talks as well. I’m not … Continue reading →

A couple of days ago I finally released the first Julia project I had alluded to, a technique to compute key rates in QKD using proper conic methods. The paper is out, and the github repository is now public. It’s … Continue reading →

I’m quite happy, this is pretty much the best grant available in Spain, it gives me a lot of money for 5 years, including a PhD student and a postdoc. But the reason I’m posting about it here is to … Continue reading →

Since I’ve first used MATLAB I have dreamt of finding a replacement for it. Not only it is expensive, proprietary software, but also a terrible programming language. Don’t get me wrong, I’m sure it was amazing when it was invented, … Continue reading →