Introduction to Quantum Information The classical theory of computation usually does not refer to physics. Pioneers such as Turing, Church, Post and Goedel managed to capture the correct classical theory by intuition alone and, as a result, it is often falsely assumed that its foundations are self-evident and purely abstract. They are not! Computers are physical objects and computation is a physical process. Converse.js Introduction This is a public and independent XMPP server which respects your privacy. With more than ten years of a tradition we are still free for everyone to use. Not enough hours in the day? Scientists predict time will stop completely The theory of time running out was devised by researchers from two Spanish universities trying to explain why the universe appeared to be spreading continuously and accelerating. Observations of supernovae, or exploding stars, found the movement of light indicated they were moving faster than those nearer to the centre of the universe. But the scientists claimed the accepted theory of an opposite force to gravity, known as dark energy, was wrong, and said the reality was that the growth of the universe was slowing.
Physics 219 Course Information John Preskill Go to the home page of Ph219/CS219 for 2013-14.Go to the home page of Ph219/CS219 for 2011.Go to the home page of Ph219/CS219 for 2008-09.Go to the home page of Ph219/CS219 for 2006-07.Go to the home page of Ph219/CS219 for 2005-06.Go to the home page of Ph219/CS219 for 2004. Lecture Notes The first 6 chapters were originally prepared in 1997-98, Chapter 7 was added in 1999, and Chapter 9 was added in 2004. Richard Feynman videos Videos This page has been recently updated. The Fantastic Mr Feynman - BBC documentary, May 2013 Feynman's 1984 lecture on Tiny Machines (79 minutes) X 4, 041013 (2014) - Quantum Phenomena Modeled by Interactions between Many Classical Worlds We investigate whether quantum theory can be understood as the continuum limit of a mechanical theory, in which there is a huge, but finite, number of classical “worlds,” and quantum effects arise solely from a universal interaction between these worlds, without reference to any wave function. Here, a “world” means an entire universe with well-defined properties, determined by the classical configuration of its particles and fields. In our approach, each world evolves deterministically, probabilities arise due to ignorance as to which world a given observer occupies, and we argue that in the limit of infinitely many worlds the wave function can be recovered (as a secondary object) from the motion of these worlds.
Embrace Enterprise 2.0 Trifecta - The BrainYard Half measures won't work. Enterprises must adopt social/mobile, cloud, and big data technologies—all of them, not just one or two. 12 Top Big Data Analytics Players (click image for larger view and for slideshow) In the six or so years I've been working with enterprise information technologies, I've seen three technology sets take off: social-and-mobile (2006-'07), cloud computing (2008-'09), and big data (2011-'12).
Breakthrough in physics may lead to new view of magnetism An artistic representation of a ‘polaron’ – a new quantum state, or a ‘quasiparticle’. The potassium atom in the middle (blue) repels the smaller lithium atoms (yellow). This creates a complex state, which physically can be best described as a quasiparticle (Illustration: Harald Ritsch) Quantum Physics Revealed As Non-Mysterious This is one of several shortened indices into the Quantum Physics Sequence. Hello! You may have been directed to this page because you said something along the lines of "Quantum physics shows that reality doesn't exist apart from our observation of it," or "Science has disproved the idea of an objective reality," or even just "Quantum physics is one of the great mysteries of modern science; no one understands how it works." There was a time, roughly the first half-century after quantum physics was invented, when this was more or less true.
Relativistic Baseball What would happen if you tried to hit a baseball pitched at 90% the speed of light? - Ellen McManis Let’s set aside the question of how we got the baseball moving that fast. We'll suppose it's a normal pitch, except in the instant the pitcher releases the ball, it magically accelerates to 0.9c. From that point onward, everything proceeds according to normal physics. Quantum Chaos Editor's Note: This feature was originally published in our January 1992 issue. We are posting it because of recent discussions of the connections between chaos and quantum mechanics. In 1917 Albert Einstein wrote a paper that was completely ignored for 40 years.
- StumbleUpon A Theory on the Deja Vu or Déjà vu Phenomenon During the time while this web-page has been on the Internet, more than three thousand people (up to Nov 2009) have e-mailed to say that they have Déjà Vu experiences. That is interesting, but their descriptions have virtually always described some different phenomenon. If a person has any pre-knowledge of something that is yet to happen, like in a dream, it cannot be Déjà Vu, and is likely to be some type of Precognition. Susskind Lectures Listed below are the (current) set of courses on theoretical physics courtesy of Stanford University. The lecturer is Professor Leonard Susskind, an eminent theoretical physicist and one of the founding fathers of string theory. A profile of Professor Susskind is available on Wikipedia. These lectures can be considered to be - and are sometimes referred to as - the Theoretical Minimum, meaning that the material covered in each course is the minimum that could be taught in order to define and use key concepts of modern physics. I suppose it would be possible to complete some of these courses without a good mathematical grounding, but I imagine a reasonable knowledge of algebra, geometry and calculus is pretty much required to understand most of the lectures. Professor Susskind also assumes a knowledge of Newton's laws of motion.
Quantum physicists show a small amount of randomness can be amplified without limit Once again quantum physics gives us philosophical implications: physicists showed how a small amount of randomness can be amplified without limit. Classical physics is deterministic: for example, we can determine the position and velocity of a particle at any time in the future. Quantum theory, on the other hand, states that there exist processes which are fundamentally random: for instance, the outcomes of measurements of quantum particles seem to be determined entirely by chance.