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Author Archives: Mateus Araújo
Meaningful Bell inequalities
Since I’ve started learning about Bell inequalities, it always bothered me that they are usually present as just some linear combinations of conditional probabilities, without any physical interpretation besides the fundamental fact that the maximal value this linear combination can … Continue reading
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The ChoiJamiołkowski isomorphism: you’re doing it right
Yes, you are. There’s nothing to worry about. I’m just writing this blog post because there are some people trying to convince you otherwise, and I don’t want you to get trolled by them. First of all, what is the … Continue reading
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A great month for the quantum switch
If you’re a fan of the quantum switch, like me, the arXiv brought two great news this month: first, an ArgentinianBrazilianChilean collaboration finally managed to implement a superposition of more than two causal orders, as I had been bothering people … Continue reading
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Boris Tsirelson 19502020
Boris Tsirelson died on the 21st of January 2020 in Switzerland, via assisted suicide after being diagnosed with high grade cancer. It is with great sadness that I type these news. I never met him personally, but I appreciate his … Continue reading
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Infinity in Nature?
Last week a bomb landed on the arXiv: Ji et al. posted a proof that MIP*=RE which implies, among other goodies, a solution to Tsirelson’s problem. I’m speaking here as if their proof actually holds; I can’t check that myself, … Continue reading
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scientists4future #unter1000
I just signed the #unter1000 pledge to not fly to destinations that are under 1,000 km away, and I encourage every reader to sign as well. We, scientists, need to set an example. We understand better than most the dire … Continue reading
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Quantum supremacy won me a bet
About three years ago, on 21.03.2016, I made a bet with Miguel Navascués. At the time superconducting qubits were in their infancy: devices based on them had very few qubits, and quite shitty ones at that. Nevertheless, I was sure … Continue reading
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Superdeterminism is unscientific
Yesterday I saw with disappointment a new paper on the arXiv by Hossenfelder and Palmer, Rethinking Superdeterminism. There they argue that physics took a wrong turn when we immediately dismissed superdeterminism; instead it is a solution to the conundrum of … Continue reading
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Nerd sniping
Last week a friend of mine, Felipe, left written the following equation in the blackboard of the coffee room: \[ \frac{a}{b+c} + \frac{b}{c+a} + \frac{c}{a+b} = 4,\]asking for a solution with positive integers. It was a harmless sort of nerd … Continue reading
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State estimation is dead. Long live purification
I have just been to Perimeter Institute, by generous invitation of Thomas Galley. I gave a talk there about my recentish paper, Probability in two deterministic universes. Since I have already blogged about it here, I’m not writing about it … Continue reading
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