What is Computing: Definition and 730 Discussions

Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes and development of both hardware and software. It has scientific, engineering, mathematical, technological and social aspects. Major computing disciplines include computer engineering, computer science, cybersecurity, data science, information systems, information technology and software engineering.

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  1. J

    Help with quantum computing notation

    Hi everyone! Sorry for the bad English! I'm trying to read the "entanglement between photons that never coexisted " from 2012. Avaliable at: https://arxiv.org/abs/1209.4191 And there's this equation: ## |φ± \rangle = \frac 1{√2}(|HaHb ± |VaVb\rangle) ## ## |ψ± \rangle = \frac 1{√2}(|HaVb ±...
  2. JD_PM

    Computing the second virial coefficient

    Homework Statement ##b_2## is the second virial coefficient Homework Equations Virial expansion: $$P = nkT(1 + b_2 (T)n + b_3 (T)n^2...)$$ $$b_2 = -\frac{1}{2} \int dr f(r) $$ r is the distance vector. $$f(r) = e^{-\beta \phi(r)} - 1$$ The Attempt at a Solution $$b_2(T) = 2 \pi r^2...
  3. Math Amateur

    I Computing the Directional Derivative ....

    I am reading Jon Pierre Fortney's book: A Visual Introduction to Differential Forms and Calculus on Manifolds ... and am currently focused on Chapter 2: An Introduction to Differential Forms ... I need help with Question 2.4 (a) (i) concerned with computing a directional derivative ...
  4. E

    I Computing QED amplitudes in a collider

    Hi there, While reviewing the theory of Feynman diagrams for QED, a question came into my mind. In the textbooks, one usually deals with processes involving two incoming particles. But I could imagine a process where four particles are interacting (e.g. attached picture) and this can give a...
  5. stevendaryl

    Surviving the Apocalypse: The Future of Computing Technology

    If there were some kind of catastrophe that ended civilization, is there any way that the survivors could continue to use computers? I suppose modern electronic equipment can last pretty long before it starts breaking down, but the replacement components, semiconductor chips, wouldn't be...
  6. Peter Alexander

    Engineering Computing resistance in given circuit with BJT

    Hi, before you proceed with reading this question, I would like you to know what I do not expect anyone to solve this task for me. I have a problem with a single step in the solution and I'm only asking you to help me with this one step. 1. Homework Statement Compute ##R_B## so that Q-point of...
  7. 1

    Quantum Textbook for Quantum Computing

    Hello, I am looking for a good textbook to learn quantum computing. My background is that I am a double major in math and computer science, and I pretty much don't know anything about quantum mechanics. I prefer something that is more computer science oriented, like quantum algorithms, rather...
  8. beefbrisket

    I Computing inner products of spherical harmonics

    In this video, at around 37:10 he is explaining the orthogonality of spherical harmonics. I don't understand his explanation of the \sin \theta in the integrand when taking the inner product. As I interpret this integral, we are integrating these two spherical harmonics over the surface of a...
  9. F

    I Computing a value of radius for a typical white dwarf

    I try to get a correct result for the radius of a standard white dwark (roughly 10000 km). I just want the order of magnitude , i.e with the common values of a solar mass into Earth radius sphere. From http://www.astro.umontreal.ca/~bergeron/CoolingModels/Synthetic_Calibration.pdf page 1223...
  10. Ramtin123

    A Computing amplitude for divergent loop diagrams?

    I am trying to compute the cross-section for the diagram below with a divergent triangle loop: where ##X^0## and ##X^-## are some fermions with zero and negative charge respectively. I am interested in low energy limits, so you can consider W-propagator as ##\frac {i\eta_{\mu\nu}} {M_w^2}##...
  11. B

    A Question about computing residues after substitution

    Hi members, See attacged PDF file for my question Thank you
  12. beefbrisket

    I Sign mistake when computing integral with differential forms

    The question provides the vector field (xy, 2yz, 3zx) and asks me to confirm Stokes' theorem (the vector calc version) but I am trying to use the generalized differential forms version. So, I am trying to integrate \omega = xy\,dx + 2yz\,dy + 3zx\,dz along the following triangular boundary...
  13. K

    MHB Skew-Symmetric Tensor: Computing [W]e and Axial Vector w

    If W is a skew-symmetric tensor, (i) Write down the most general form of [W]e. (ii) Show that there exist a vector w in R3 such that Wx = w*x for each x in R3. Such a vector w is called the axial vector of W. (iii) Use part (ii) to deduce that x.Wx = 0 for any x in R3. (iv) If W has axial vector...
  14. jedishrfu

    Major Quantum Computing Advance Made Obsolete by UT Grad

    https://www.cs.utexas.edu/news/2018/major-quantum-computing-advance-made-obsolete-ut-grad
  15. jedishrfu

    Domain of Science on Quantum Computing

    In this DOS video, he talks about 5 common misconceptions on QUantum COmputing:
  16. Mr Davis 97

    Computing a centralizer in D_8

    Homework Statement If ##A = \{1,r^2,s,sr^2 \}##, compute ##C_{D_8}(A)## Homework EquationsThe Attempt at a Solution So I am not exactly sure what is the best way to do this, but here is what I tried. From previous problems I know that ##Z(D_8) = \{1, r^2 \}##. So ##Z(G) \le C_{D_8}(A) \le...
  17. S

    Programs Which Minor Will Make Me More Marketable in Applied Physics?

    I am enrolled at the University of Waterloo's Honours Physics Program with a specialization in Applied Physics. In the future I would like to either work as a physicist conducting research or work on developing energy sources like nuclear or solar power. My main options would include a minor in...
  18. E

    I Quantum Computing and Superposition of states

    I'm watching a lecture on the intro to quantum computing. See the attached image which will be useful as I describe my question. So the professor says that we have this single photon and it's in this state, ## | 0 > ##. He states that when we send this photon through a beam splitter that it...
  19. J

    I Computing Polyakov Loops in Lattice QCD (Basic Question)

    Hi PhysicsForums, I have a pretty basic question about extracting physical parameters from lattice QCD simulations. As described in "Quantum Chromodynamics on the Lattice" by Gattringer and Lang, it seems we should be able to extract the static quark/anti-quark potential by considering the...
  20. G

    Trouble computing the cosine of a complex number

    Mentor note: Thread moved from technical section, so missing the homework template. Hi all, I have a homework problem which asks me to compute the complex number cos(π/4 + π/4 i). I've been playing around with it for a while now and just can't seem to get the answer I get when using Wolfram...
  21. P

    A Compute Normal Forces on Box Sides via Stress-Energy Tensor

    Suppose one has a box moving through flat space-time with a stress energy tensor ##T^{ab}## that's non-zero inside the box and zero outside the box. How does one compute the normal forces on the faces of the box associated with it's motion? I am assuming that the normal forces are measured...
  22. W

    Maple Computing Numerical Integrals with Maple

    Hi all, I am new to the Maplesoft software and have been experiencing trouble computing numerical integrals. I defined a few mathematical functions in terms of a few variables like so: I then used "subs" to input values to anything that isn't already a defined constant (like ##\hbar,\pi## and...
  23. B

    Computing Alternator Back EMF as a function of load current

    I am attempting to make a basic model of an alternator and determine terminal voltage levels at several different current levels. The alternator design looks like this: 900 RPM fixed, 60hz, single phase 2000 gauss permanent magnet Flux Density, Magnet circumferential velocity 9.58 m/sec, 4...
  24. G

    Studying Self-Studying Scientific Computing for future graduate study

    I like to start a graduate program in scientific computing within the next 4-5 years, once my kids are a little older, my wife finishes her degree, and I have more money saved. In the meantime, I’m not going to waste time. Using the MIT challenge completed by Scott Young as inspiration, I’ve...
  25. E

    Amount of computing power needed for whole-brain emulation?

    What is the approximate amount of computing power that is required for real-time emulation of the entire human brain? Such computing power would be necessary for theorized AI systems in the future. From my understanding, no computer that exists in the world today can do this, yet...
  26. G

    Programs MS in scientific computing or statistics from online courses

    I find both subjects interesting, to the point where every night after putting the kids to bed, I spend a few hours self-studying, but I wonder if going back for a master's degree would be worth the effort. I know that if I want to do professional work in either of these two subjects I'll need...
  27. D

    What is Leakage in terms of quantum computing?

    I am doing a project on stabilizer code, and I keep running into a term about qubits and leakage. What does leakage mean?
  28. R

    Programs Prospects of Pursuing Graduate Studies in Quantum Computing

    Hello, I am close to finishing my undergraduate degree in Computer Engineering, and I am very interested in pursuing graduate studies. For a long time, I have been passionate about computer science and I've been looking into the research done in various labs in the schools that I'm considering...
  29. facenian

    I Computing CHSH violation bound

    It seems that the upper bound of the CHSH inequality is ##2\sqrt{2}## How is it analytically derived?
  30. S

    Fortran Porting Python Code to Fortran for Parallel Computing

    I have a simulation that involves a lot of dense linear algebra with a lot of complex arrays, that was written in python's numpy and then sped up with cython. Unfortunately I'm stuck with python's GIL (global interpreter lock), which prevents the use of numpy with multi-threaded code. I'm...
  31. S

    Quantum Computing and memory capacity

    Does quantum computing have any profound implications for the memory capacity of computers? It's often possible to replace a large table of data by a smaller set of numbers and an algorithm that reconstructs each entry of the table using the smaller data set. Will quantum computers made such...
  32. lekh2003

    Other What courses should I pursue? (for quantum computing)

    I am a middle-school student and I have just recently finished a course in Honors Physics and have already started one on AP Calculus. I have been reading quite a few books on quantum physics. I just recently started one on quantum computing and it is very interesting. Interesting enough I might...
  33. S

    Question about O(log n) algorithm for computing a^n

    Homework Statement Let a be an integer and n be a non-negative integer. Without changing the values of a and n, produce an algorithm, of O(log n) complexity, which computes a^n. Homework Equations For integers a, n and i, where n >= 0 and is even, where i >= 1 and where a has no further...
  34. A

    Computing angular speed wrt CM I get a contradiction

    Hello! I have been brushing up my Rigid Body Dynamics. I tried computing the angular speed with respect the Center of Mass (CM) using the usual split of kinetic energy and also the split of Angular momentum using the CM. First, a simple case: Two particles of mass M each separated by a distance...
  35. S

    Algorithm for computing the depths of all the nodes of tree

    Homework Statement Give an algorithm for computing the depths of all the nodes of a tree T, where n is the number of nodes of T. a) What is the complexity of your algorithm in terms of Big-O? b) What is the best possible complexity that you believe can be achieved when solving such problem...
  36. Spinnor

    Google’s quantum computing plans threatened, IBM

    "Just when it was looking like the underdog, classical computing is striking back. IBM has come up with a way to simulate quantum computers that have 56 quantum bits, or qubits, on a non-quantum supercomputer – a task previously thought to be impossible. The feat moves the goalposts in the fight...
  37. J

    Programs CE + Phys or CE + Math: Interested in Quantum Computing & AI

    Hey all, I'm a student in university who wants to Double Major in Computer Engineering and Physics or Computer Engineering and Mathematics. Ideally I want to get some time in working on quantum computers and some time in working on advanced AI, so one of the big things I want to do is pick the...
  38. J

    Which Major Best Supports a Career in Quantum Computing and AI?

    Hey all, I'm a student in university who wants to Double Major in Computer Engineering and Physics or Mathematics. Ideally I want to get some time in working on quantum computers and some time in working on advanced AI, so one of the big things I want to do is pick the community's brain on...
  39. C

    How much would a quantum computing network rely on power?

    Let's say an entire city runs on a network run by quantum computing. Fail safe locks are run by this network. Would triggering a massive unlocking of the city be a simple matter of killing the main power to shut down the quantum network (by shutting down the cooling systems)? It seems logical...
  40. gerardofingurbe

    Do you Guys bet on quantum or biological computing?

    I just want to know Your opinions
  41. T

    Which Courses Would Benefit Me for Quantum Computing?

    Hello, I’m currently an Undergraduate Computer Engineer at UIC and minoring in physics. I have become more and more interested in Quantum Computing and its related fields. I plan on continuing my masters in Electrical engineering (Nano - technology). I was wondering if you could help me out in...
  42. scottdave

    Science which goes into computing hurricane predictions

    With Hurricane Harvey hitting the Texas Gulf Coast, I came across this article, while trying to learn about these different computer models. I found the article in this PDF file an interesting read. I'm sure that there have been some advances in real-time prediction methods, since this article...
  43. Q

    Trig idents while computing limit

    My screenshots show an attempt at a solution and the given solution path from the book, but I can't seem to figure it out.
  44. P

    I What does it mean to span the Bloch sphere?

    If I construct a set of qubit gates, say {G1, G2 ... Gk ... Gn}, that can act on a state |ψ>, what does it mean for the set of states Gk |ψ> to span the Bloch sphere? As an example, take the set {G1, G2, G3, G4} = { I, X π/2 , Y π/2, Xπ } Here, X π/2 denotes a π/2 rotation about the x-axis, Y...
  45. Q

    Physics Orienting myself toward quantum computing or a related field

    I am well aware that QC-related graduate programs are competitive so I am preparing myself for a rejection. Not because I'm unconfident. But because everyone should have a backup plan just in case. I haven't applied yet because I'm about to take the GRE. I really do enjoy both quantum physics...
  46. Technik

    Programs What path to follow for scientific computing?

    I am 26 years old and currently working on my B.Sci. in Computer Science. I am also interested in astronomy and physics as well, and my dream job would be something where I can combine those interests and work alongside scientists and researchers. I love science and as long as I make a...
  47. F

    Mastering Uncertainty Calculations: A Guide for Lab Courses and Beyond

    Hello, took a year off school and starting school soon. So I'm shaking off the rust and remembered in my previous lab courses we were supposed to compute uncertainties but I never really understood how that works. All I remember was its something to do with pythagorean theorem. I want to really...
  48. Q

    Other Job prospects in scientific computing

    Which sub field of scientific computing has better employ ability and job prospects? (within computational physics & computational biology). I meant both in industry and research oriented jobs where we would use the skills and knowledge relevant to the degree.
  49. L

    Computing the scattering amplitude from the S-matrix

    Homework Statement Consider two real scalar fields \phi,\psi with masses m and \mu respectively interacting via the Hamiltonian \mathcal{H}_{\mathrm{int}}(x)=\dfrac{\lambda}{4}\phi^2(x)\psi^2(x). Using the definition of the S-matrix and Wick's contraction find the O(\lambda) contribution to...
  50. Mr Davis 97

    Computing the order in a polynomial quotient ring

    Homework Statement Consider the quotient ring ##F = \mathbb{Z}_3 [x] / \langle x^2 + 1 \rangle##. Compute the order of the coset ##(x+1) + \langle x^2 + 1 \rangle## in the group of units ##F*##. Homework EquationsThe Attempt at a Solution I was thinking that I just continually compute powers...
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