Computing Definition and 683 Threads

AS: If this is not the right place to ask this question, please let me know where I could try. Thanks. AS: I had to validate the fact I used the template to post my assignment, however I didn't (but it wouldn't post otherwise - btw it's not an "assignment"). Hello everyone. I need help with a...

Homework Statement In a TV-show, an inexperienced doctor touches the electrodes of a defibrillator and gets thrown across the room. For a moment assuming that all the energy (and only the energy) from the defibrillator goes into tossing him around, what is the maximum height above ground he...

Hello I have recently taken interest in physics and mostly Quantum computing and i was wondering what is the best way of tackling that field . Is it to have a major in Computer Science and possibly a major/minor in physics? or to aim for colleges that have specific classes of quantum...

Hi guys, I'm working with this interaction Lagrangian density ##\mathcal{L}_{int} = \mathcal{L}_{int}^{(1)} + \mathcal{L}_{int}^{(2)} + {\mathcal{L}_{int}^{(2)}}^\dagger = ia\bar{\Psi}\gamma^\mu\Psi Z_\mu +ib(\phi^\dagger\partial_\mu \phi - \partial_\mu\phi^\dagger \phi)Z^\mu,## with ##...

This is Exercise 2.20 in Nielsen and Chuang's Quantum Computation and Quantum Information, on page 71. Suppose $A'$ and $A''$ are matrix representations of an operator $A$ on a vector space $V$ with respect to two different orthonormal bases, $|v_i\rangle$ and $|w_i\rangle$. Then the elements...

Exercise 2.24 on page 71 of Nielsen and Chuang's Quantum Computation and Quantum Information asks the reader to show that a positive operator is necessarily Hermitian. There is a hint given; namely, that you first show an arbitrary operator can be written $A=B+iC$, where $B$ and $C$ are...

Hello, Am an undergraduate student of physics(hons) and want to work on Quantum Computing in future. Can anybody please suggest how I should go about it? Thanks in advance

Hello everyone, I have a cluster computing that I am going to be setting up for scientific computing. I have never done this before and I was wondering, on a server what kind of operating system would be approiate to place on the cluster? As in, would a desktop or server operating system be...

Hello everyone, I'm an undergraduate double majoring in physics and math. I have one year left after this one, then I plan to go to grad school for theoretical physics (not sure what field yet). My professor keeps suggesting the physics side of quantum computing as a good career route and I'm...

I am beginning a study I have long wanted to engage in: quantum computing. This is a field lying at the intersection of mathematics, physics, computer science, and electrical engineering - all topics I studied, to varying levels. From time to time, I plan on posting notes and summaries that...

Hello All, I've just recently read David Deutsch and Michael Lockwood article about Time Travel of 1994 in Scientific American.They stated,that although among the physicists Everett's theory remains controversial,it has no alternatives in Quantum Cosmology and Quantum Computing.Is it really...

I have seen other posts here on PF and I have done some internet research. In what I have found so far it is hard to get a plain English answer around the number system that is used in quantum computing. A lot of references are made to binary with a superposition. Is there a way to simple way...

Hey everyone, I'm sorry if this is not the right place to ask this, but here it goes: I have to do a presentation on a topic on quantum computing. Does anyone know any cool doable topics? We have been working through Ballentine's quantum mechanics book, to give you an idea of the level. Thanks!

Let me introduce myself. I am Kevin Luxford. I graduated in Science, majoring in Physics, at Canterbury University, New Zealand, in 1963. I subsequently graduated in Engineering (Electrical) from the same university in 1966. A year or so ago I had the opportunity to tour the Australian...

What is quantum computing research mostly focused on? I mean, is it mostly about a physical point of view ( Like building better quantum transistor, or better quantum diodes, or, for example, using entalgment effect, to achieve better purposes), or is it mostly focused with quantum architectures...

Homework Statement The deuteron is mostly a bound state of a proton and neutron with orbital angular momentum L=0 and spin S=1. To a good approximation we can neglect the proton-neutron mass difference and electromagnetic interactions, and treat the proton and neutron as two isospin components...

Hello all, On Cosmology webstie I found the article about Time Travel,Uncertainty Principle and Many Worlds. Here is the quote: "DeWitt’s many-worlds interpretation of Everett’s work, posits that there may be a split in the combined observer–object system, the observation causing the splitting...

I am working on a project for our local science fair and decided on researching quantum computers. (This is what my focus will be in college.) Though, I expect to work on this far past the time allotted for that. I would like to build a superconductor based qubit using Josephson Junctions. The...

Hi. I am doing some complex computations using c, c++, matlab, python. It is very slow on a conventional PC. I heard, there is a way to do scientific computations remotely. Such that I could sort of get an access to the remote advanced PC, and perform computation remotely there. And then...

Hello, I am a Physics undergraduate, currently beginning my third (out of four) year of studies. I have already taken courses about Real and Complex Analysis, Linear Algebra, ODEs and PDEs (for Maths), Classical Mechanics (Lagrangian and Hamiltonian formalism), Electromagnetism, Special...

My question is how does the uncertainty principle relate to quantum computers? Does it hinder the theoretical production of a quantum computer?

I'm graduating this year with a B.S in Computational Physics (the difference is the second semester upper division physics courses aren't required, and are replaced with a year of numerical analysis and a CS minor. But I took the 2nd semester physics back when I was a physics major anyways) and...

Good afternoon, I wonder if someone can help me in a small doubt. I'm trying to calculate the orbital parameters of some solar system bodies. It's quite easy knowing their positions and velocities. But my question is this: these two components, position and velocity, must they be heliocentric...

Greetings, I want to ask if there is any subroutine for computing a global spherical harmonic reference field. I read journal and they say it exists, I hope we can share information regarding this subject. Thank you in advance.

Hi everyone, this isn't homework problem but something i would like to study and i am currently interested into. So how to start, this problem belongs more to quantum chemistry but i haven't found the topic in chemistry part of this site. I am learning to compute with program GAMESS but since...

I've been reading Code: The Hidden Langauge of Computer Hardware and Software by Charles Petzold, and he described the 5 basic gates (AND, OR, NAND, NOR, & XOR) with extreme clarity. In the chapter about adding machines, he described that we needed a gate that relays only when it receives a 0...

I am currently considering either a BSc (Applied Math and Computer Science) or BSc(Computing) at a distance learning university called UNISA. From what I can see the former is the one I think would be best as it has the best math courses between the two(Computing only has Linear...

With X having the exponential $(\lambda)$ distribution and $Y = X^3$, how do I compute the joint cumulative distribution function? Here is how far I've come: $F(x,y) = P(X ≤ x, Y ≤ y) = P(X ≤ x, x^3 ≤ y) = P(X ≤ x, X ≤ y^{1/3}) = P(X ≤ min(x, y^{1/3})$, $f_x(x) = \lambda e^{-\lambda x}$$ for...

Homework Statement The displacement of a machine is given by the simple harmonic motion as x(t) = 5cos(30t)+4sin(30t). Find the amplitude of motion, and the amplitude of the velocity. Homework Equations x''(t) = -4500cos(30t)-3600sin(30t) The Attempt at a Solution [/B] I should note that...

The setting strongly require rather unimpressive processors and not high enough demand to create multiple processors. On the other hand there would be clearly a big need for computation power. The solution that I can think of is going simple. In case of devices requiring little computation power...

Hi, I've made a "probability" histogram for my data and it's based on 14000 datapoints in total, BUT each bin is not the same (e.g. bin 1 might be composed on 200 total datapoints while bin 50 is only 3 data points). You can find it in image 1. Now, based on those relative frequencies, I...

Recently I've been in a discussion with someone online who claimed that the efficiency of a computer with regards to energy is not a linear relationship. I assumed that if you were to halve the power going into a computer chip (assuming it was designed to deal with that and wouldn't just turn...

Consider the problem of computing the entanglement entropy of two CFTs in the thermofield double state on identical finite intervals in 1+1 dimensions. The Euclidean path integral is then equivalent to computing the 2-point twist correlator on a torus. Given a central charge ##c##, does anyone...

I'm just trying to put together a very basic engine model with extremely limited combustion. Basically, I am modeling isentropic compression, combustion (using LHV to calculate the delta T), and isentropic expansion. At the moment, I am calculating a peak cylinder temperature under motoring of...

Homework Statement Hey, so basically I'm doing Advanced Higher Computing Science at school (It's a Scottish qualification), and I need to build an orbital simulator in VB.Net 2008 (nothing too fancy), but I'm having issues planning it all out. I'm only going to have one planet orbiting a star...

suppose a side of an equation : 26q+1 , and i want the least positive integer value for q that makes this side of equation divisible by 7, is there any short method to do this ?

Hello guys, I will be starting my M.S Program in Solid State Electronics and was also curious about looking into quantum computing/superconductors. So can you guys suggest introductory levels books on quantum computing and and superconductors? I have an okay background in Physics (just...

Can anyone please explain the theory of Quantum Computing in just 10 sentences?

Hi. I am an undergraduate physics student and I really like the field of quantum computing. Can someone please tell me how good are the opportunities to work and research in this field? As I understand, there are not many places that do research in quantum computers as compared to something like...

Simple question: Can a computer be taught to recognize a paradox? This assumes the computer has no cognizant reasoning or "self awareness". It is a plot device used in a lot of science fiction, that the intrepid "flawed" human hero defeats the computer or robot with a simple paradox making it...

Homework Statement If all we know is that the media is 1.001, how can we compute the Cherenkov angle and threshold momentum of electrons,muons, pions, and kaons?Homework Equations I know that cos(theta_c) = 1/beta*n, where beta = v_p/c and n=c/v_em, where v_p is the particle velocity and v_em...

Hi, I have been trying to find an integral ## \int_{-\infty}^{+\infty} \frac{ e^{-\sqrt{(x^2 + 1)}}}{(x^2 + 1)^2} dx ##. I initially posted this question in the complex analysis forum since I felt it might be done using contour integration. However now I realize it might not be the best way...

Hello, I am trying to understand how to get the residue as given by wolfram : http://www.wolframalpha.com/input/?i=residue+of+e^{Sqrt[x^2+%2B+1]}%2F%28x^2+%2B+1%29^2 The issue I am facing is - since it is a second order pole, when I try to different e^{\sqrt{x^+1}} I get a \sqrt{x^+1}...

I want to produce some realistic figures showing the spatial trajectories of test particles in a Schwarzschild spacetime. For instance, I'd like to start a massive test particle at aponegricon (how often do you get to use that word!?) in an orbit that Kepler and Newton would have predicted to be...

Hi, I am in the process of deleting some services ( or at least stopping them from being loaded upon starting up), but I don't want to delete my restore points. Which services will have the effect that their removal will delete restore points? WWGD: What Would Gauss Do? ( If he knew about...

Homework Statement I'm currently working on a project in which I have to solve the energy eigenvalues of the Schrodinger equation to compute the mass of certain Mesons. We've been taught very little programming (so apologies that my understanding is very basic), and are therefore given any...

Hey everyone. I'm sorry if I'm posting something irrelevant here. I really don't know where to ask this question but this hit me while learning Computing Principles (It's my first day in college). I'm one who is interested in physics too. Hence, I got a little confused about the term...

Is anyone in this forum interested in computing meteor trajectories?

Homework Statement I've used all the proper equations and done all the work with no problem. My only question is when computing the maximum stress, how do I know which one is the tensile and which on is the compressive? I've attached all my work and came out with Max stress = 3.84 Mpa and Max...

Hello, given a stationary pointlike particle with mass m at some position, I'm trying to compute just how much space is curved/deformed at a distance r from that particle due to its gravitational field. I'm not really into all that tensor calculus, so I really struggle with the equations given...