A result of much quantum coolness out today: arXiv:0807.4935 (scirate): “Quantum Communication With Zero-Capacity Channels” by Graeme Smith and Jon Yard. Strange things they are going on when we try to use our quantum cell phones, it seems. Quantum cell phones, what the hell? Read on…
Continue reading “When Two Zeros Are Not Zero: The Strange Lives of Quantum Cell Phones”
Not Cuil
Sure quantum computers can find a needle in an unstructured haystack quadratically faster than their classical brethren, but I didn’t think the word “quantum” and “search” would appear in the press quite this soon: Ex-Googlers reinvent web search: Quantum porn (not safe for work! i.e. they show the quantum porn!) and Quantum porn engine foiled by strawberries and muffins: How the Cuil kids live. And yes, I “cuil”ed my own name, and no, this blog doesn’t come up (nor any quantum porn.)
SciRate Papers: 7/18 to 7/25
In attempt to keep my reading more current, I’m going to try to post the top rated arXiv papers on SciRate each week and hopefully add about the papers. Let’s see how long I can keep it up (bets?)
Continue reading “SciRate Papers: 7/18 to 7/25”
Devilish Dice Games
A new entry in the best title ever competition appeared last week on the arXiv:
arXiv:0806.4874
Why devil plays dice?
Authors: Andrzej Dragan
Abstract: Principle of Relativity involving all, not only subluminal, inertial frames
leads to the disturbance of causal laws in a way known from the fundamental
postulates of Quantum Theory. We show how quantum indeterminacy based on
complex probability amplitudes with superposition principle emerges from
Special Relativity.
I bet the devil would play a mean game of liar’s dice.
George Soros Meets Kochen-Specker
I’ll admit it: I like reading George Soros’ books. I mean, here’s a guy whose made a godzillion dollars in the financial markets, has been behind political destabilizations/stabilizations worldwide, taken on a U.S. president (can you guess which one?), and yet, in spite of this, can write a book in which he talks his own brand of….philosophy and how it relates to life, the universe, and the current financial crisis. Whah?
Continue reading “George Soros Meets Kochen-Specker”
Teaching Generalizations of Probability
Hoisted from the comments, Robin asks:
So, with that in mind, here’s a question. What do you think about teaching quantum mechanics as noncommutative probability theory? In other words, by starting with probability theory and alluding to probabilistic mechanics (e.g., distributions on phase space), and then introducing quantum theory as a generalization of probability.
This is how I think of quantum theory all the time now — and it makes tremendous sense to me. I think it’s how I want to teach it. And I’m curious what y’all think.
Political Interpretations of Quantum Theory
Over at the Optimizer’s place, the Optimizer compares libertarians and those who believe in the many worlds interpretation of quantum theory. (Key Ron Paul apologists in three, two, one…) An amusing comparison. So if many worlders are the libertarians of interpretations of quantum theory, what political parties do the other interpretations of quantum theory fall under?
Continue reading “Political Interpretations of Quantum Theory”
In Probability We Trust?
When discussing ways that quantum computing may fail, a common idea is that it may turn out that the linearity of quantum theory fails. Since no one has seen any evidence of nonlinearity in quantum theory, and it is hard to hide this nonlinearity at small scales, it is usually reasoned that these nonlinearities would arise for large quantum systems. Which got me thinking about how to well we know that quantum theory is linear, which in turn got me thinking about something totally wacko.
Continue reading “In Probability We Trust?”
The Computer, the Universe, and John Wheeler
It was an unassuming blue-grey volume tucked away in the popular science section of the Siskiyou County Library. “Spacetime Physics” it announced proudly in gold letters across the front of the book. Published in 1965, the book looked as if it hadn’t been touched in the decades since 1965. A quick opening of the book revealed diagrams of dogs floating beside rocket ships, infinite cubic lattices, and buses orbiting the Earth, all interspaced with a mathematical equations containing symbols the likes of which I’d never seen before. What was this strange book, and what, exactly, did those equations mean? How could there be equations and dogs and buses all in the same book? Answering these questions would be the beginning, for me, of a lifelong love of physics. It would also inspire in me a deep love of science books which make you smile, and, more importantly perhaps, led me to works of the physicist John Archibald Wheeler, who would serve as the model of the researcher I have always wanted to be.
Continue reading “The Computer, the Universe, and John Wheeler”
John Archibald Wheeler (1911-2008)
I just learned the very sad news that John A. Wheeler has passed away. Wheeler was one of my heroes and inspired me in many ways to be where I am today. I’m buried under a heap of work today, but will write more when I can come up for air. Below I’ve pasted a post from my old blog describing a result I first learned about by reading a Wheeler paper.
Continue reading “John Archibald Wheeler (1911-2008)”