I have a question about the unitary matrix in page 10, with rows [1 0] and [0 i]. Instructor: John Preskill , 206 Annenberg, X-6691, email: preskill (at) caltech (dot) edu. Is this a flaw that’s specific to QC? (Using a random or pseudo-random number generator.) Repeat this process, moving in the “z” direction 1mm each time, until the experiment has been conducted within a 1 cm cube. Thanks so much to Robert Rand, Oscar Cunningham, Petter S, and Noon van der Silk for their help with this. You can follow any responses to this entry through the RSS 2.0 feed. Also set up a “control” where the same experiment is run, the same number of electrons are fired, but the apparatus stays in the same physical position the whole time instead of moving after every 10k electrons are fired. Though clearly there’s quite a bit of catching up for optics to get to where superconducting and trapped-ions are now…. 4.) I’m exactly the person you described — I’ve read QCSD but I wanted some more basics too. , You can try the auto-latex equations extension for Latex in google docs: Sorry if it has been fixed in separate lectures — at page 43 in combined pdf there seems to be a misprint in the 3th formula — |111> instead of |101>. jonas #9: Yes, you’re right. Is this information preserved in the wave function of the entire universe for each branch? It may be a cute slogan, but quantitatively it is simply not credible. Fortunately, I was pointed to a wonderful program called PDFtk, which lets me concatenate PDFs super-quickly without needing to mess around with Python scripts—so my learning how to do the latter has been (again) deferred to another day! Do we know for sure this isn’t going to make it impractical to realize many quantum algorithms? Are worlds “branching” in some “emergent time”? And I read the paper, and found no inflammatory language; the paper just summarizes various positions people have taken on the GMVH and then goes on to study its mathematical model. But you can apply a phase gate to any qubit of |0…0〉+|1…1〉 to get |0…0〉-|1…1〉 — think about it; it follows from linearity. And if so, then the state of the universe could always be thought of as a finite collection of qubits—via “coding,” as you put it. And only a few with a sufficiently stable unitary evolution law to allow ~13 billion years of evolution and Solar Systems to form etc, I mean, come on, if you’re gonna teach MWI and Penrose gravitational collapse models, then teach this crap too. Having said that, I do indeed vastly prefer someone who’s stubbornly wrong about QM than someone who stubbornly considers me a terrible person. In Lecture 4, is the “Root NOT” matrix correct? There's no signup, and no start or end dates. I edited the notes to clarify. » I probably won’t do video this year, but maybe in a future year, once the delivery is more fluid? quantum gravity. (He says, happening to think that like motion (see Zeno), matter (see Democritus), and energy (see QM), every physical quantity is not continuous but comes in finite numbers of discrete increments; although he wouldn’t bet his life on that either; almost, though.). But I have no idea how to make the Python installation realize that the PyPDF2 library is there. Quantum Operations; Operator Sum Representation; System-Environment Model (, Quantum Error Correction - Criteria and Examples (, Topological Quantum Codes; Kitaev's Anyon Model (, Stabilizers II; Computing on Quantum Codes (, Concatenated Codes; The Threshold Theorem (, Measurement and Teleportation Based Quantum Computation (, Quantum Algorithms on Graphs; Quantum Random Walks (, Quantum Algorithms: The Abelian Hidden Subgroup Problem; QFT Over Sn (, The Nonabelian HSP; Hidden Dihedral Group; Positive and Negative Results (, Channels I: Quantum Data Compression; Entanglement Concentration; Typical Subspaces (, Channels II: Holevo's Theorem; HSW Theorem; Entanglement Assisted Channel Capacity (, Channels III: Quantum-Quantum Channels, Mother/Father Protocol; Distillable Entanglement (, Quantum Protocols - Quantum Communication Complexity; Distributed Algorithms (. And the analogous issue in quantum computation doesn’t matter either, for the same reason. Big Bang happens. How do we take the 5 dollar bill without getting arrested?”. Or in other words, the given mapping should be realized by the matrix of rows [0 1] and [i 0]. Lecture 3 page two has “And we define as the inner product of ket x with ket y”. fred #37: Yeah, the resolution is simply that in this case, the CNOT gate maps a product distribution to a distribution that we previously proved can’t be a product distribution, but is instead correlated. And yes there are worlds, with tiny probabilities, where in a double slit experiment the photons all end up on one side, same as with deterministic many worlds, but the most probable outcomes are the ones we usually observe, the interference effects are a result of a mathematical calculation which just uses superpositions and schrodinger (unitary) evolution. Here’s a 184-page combined file. Would be nice to have a single document to reference. But does *mathematics* have to work this way? I, for one, would like to know how “random” events are placed within the confines of what’s predicted by the wave function. It was the first bit of content of quantum computation I found that didn’t require knowing anything about quantum mechanics, yet explained Bell’s Inequality, Grover, Simon, and Shor’s algorithms in ways I could understand (most of which didn’t even use complex numbers! But in the case of math , my dawning realization is that something strange is happening – reductionism may not work for math! Shoot me an email, and I’ll give you the link to the Dropbox folder. This is a deadline that will take a while but not forever, will motivate me to shop for a new computer (which is a necessary but unpleasant task), and even ties in to the subject of the promise (twitch.io is a website for streaming videos live, and with a more powerful computer I’ll be able to stream a video and work on other tasks that are intensive in computer resources at the same time, so using twitch.io will disrupt me less). Lecture 3 page 2 the line “Remember: the way we change quantum states is by applying linear transformations” has U transforming a column vector into a row vector. In my opinion, that is basically illegal. Jake #17: That was a mistake. […] link, notas de aula do curso “Quantum Information Science“. The idea of treating “no query” as a query is surprising to someone thinking classically! For example, I decided that while the twitch.io website has its nice, and has its good side, it is addictive, took too much time of my life and caused me to stay up too late during nights.