
Recent Posts
Archives
 July 2024
 June 2024
 April 2024
 April 2023
 March 2023
 February 2023
 December 2022
 October 2022
 August 2022
 July 2022
 April 2022
 March 2022
 February 2022
 December 2021
 October 2021
 August 2021
 May 2021
 March 2021
 February 2021
 December 2020
 October 2020
 September 2020
 July 2020
 June 2020
 February 2020
 January 2020
 December 2019
 August 2019
 April 2019
 February 2019
 October 2018
 June 2018
 May 2018
 April 2018
 February 2018
 December 2017
 November 2017
 August 2017
 July 2017
 March 2017
 February 2017
 October 2016
 September 2016
 August 2016
 July 2016
 June 2016
Feeds
Author Archives: Mateus Araújo
First Valladolid paper is out!
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
Posted in Uncategorised
Leave a comment
I got a Ramón y Cajal!
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
Posted in Uncategorised
Leave a comment
MATLAB is dead, long live Julia!
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
Posted in Uncategorised
5 Comments
The smallest uninteresting number is 198
A wellknown joke/theorem is that all natural numbers are interesting. The proof goes as follows: assume that there exists a nonempty set of uninteresting natural numbers. Then this set has a smallest element. But that makes it interesting, so we … Continue reading
Posted in Uncategorised
7 Comments
SDPs with complex numbers
For mysterious reasons, some time ago I found myself reading SeDuMi’s manual. To my surprise, it claimed to support SDPs with complex numbers. More specifically, it could handle positive semidefiniteness constraints on complex Hermitian matrices, instead of only real symmetric … Continue reading
Posted in Uncategorised
3 Comments
SDPs are not cheat codes
I usually say the opposite to my students: that SDPs are the cheat codes of quantum information. That if you can formulate your problem as an SDP you’re in heaven: there will be an efficient algorithm for finding numerical solutions, … Continue reading
Posted in Uncategorised
7 Comments
Redefining classicality
I’m in a terrible mood. Maybe it’s just the relentless blackness of Austrian winter, but I do have rational reasons to be annoyed. First is the firehose of nonsense coming from the wormholeinaquantumcomputer people, that I wrote about in my … Continue reading
Posted in Uncategorised
2 Comments
The death of Quanta Magazine
Yesterday Quanta Magazine published an article written by Natalie Wolchover, Physicists Create a Wormhole Using a Quantum Computer. I’m shocked and disappointed. I thought Quanta Magazine was the most respectable source of science news, they have published several quality, indepth … Continue reading
Posted in Uncategorised
13 Comments
Doing induction like a physicist
If something is true for dimension 2, it doesn’t mean much. We know that 2 is very special. The set of valid quantum states is a sphere, we can have a basis of unitary and Hermitian matrices for the Hilbert … Continue reading
Posted in Uncategorised
Comments Off on Doing induction like a physicist
Do not project your relative frequencies onto the nonsignalling subspace
It happens all the time. You make an experiment on nonlocality or steering, and you want to test whether the data you collected is compatible with hidden variables. You plug them into the computer and the answer is no, they … Continue reading
Posted in Uncategorised
Comments Off on Do not project your relative frequencies onto the nonsignalling subspace