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Author Archives: Mateus Araújo
Why QBism is completely empty
A good friend of mine, Jacques Pienaar, has recently converted to QBism, as often happens to people that spend too much time around Chris Fuchs. Saddened by these news, I’ve decided to write a blog post explaining why QBism doesn’t … Continue reading
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Mistakes, mistakes, mitsakes
When I write someone to tell them there’s a mistake in their paper, I usually get one of these five reactions, ordered from best to worst: “It’s not a mistake.” (and they’re right) “Indeed, that’s wrong, I’ll correct it.” “It’s … Continue reading
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The twoenvelope paradox
A colleague of mine, Simon Morelli, told me about a fascinating puzzle, the twoenvelope paradox: you can take one of two envelopes with money inside them, promised to contain one $x$ and the other $2x$ for some $x > 0$. … Continue reading
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The problem with being your own father
is not really a moral one. In the typical time travel story you were abandoned as a child, so after you travel back in time you don’t even know who is supposed to be your mother. Now what can you … Continue reading
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Meaningful Bell inequalities part 2: examples
Here I’ll show examples of the meaningful Bell inequalities I talked about in the previous post, where they are rephrased as nonlocal games and the gap between the local bound and the Tsirelson bound is made as large as possible. … Continue reading
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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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