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  1. J

    Quantum Computing

    Could you be a bit more clear about your idea? What would be your gates and qubits?
  2. J

    Solving a classical problem using quantum physics

    Wouldn't it be exactly the same as for the string except with continuous boundary conditions on the edge.
  3. J

    Difference and benefits of qubits compared to regular bits?

    A bit can be either 0 or 1. A qubit can be a quantum superposition of |0> an |1>. The benefit of the latter is that as a qubit progresses through a computation the final answer will exhibit interference effects from the different routes it could take. Algorithms can be designed so that...
  4. J

    Grover's algorithm

    thanks
  5. J

    Grover's algorithm

    I'm curious about which functions that can be implemented classically are theoretically hard to implement with a quantum algorithm?
  6. J

    Deutsch's algorithm vs classical algorithm

    Why are you assuming putting a qubit in superposition into one blackbox is equivalent to two classical black boxes?
  7. J

    Quantum computers and modelling a quantum computer on a classical computer

    I believe the answer is that a quantum computer can be simulated by a classical computer with polynomial resources and exponential time. The time isn't infinite but still I wouldn't consider it to be reasonable (it could be the life time of universe if you pick the right problem to compare them...
  8. J

    Wondering about quantum information and phase factors.

    Sounds good to me. I'm learning Quantum Information right now too, so I'm not an expert, but it looks like you've answered your question.
  9. J

    Can someone explain the quantum eraser please?

    Lets say you mark photons at the slits with either having vertical (|) or horizontal (-) polarization. On the screen it appears there is no interference, but there is. Think what happens when the phase between (|) and (-) is zero you get a diagonal polarization like this (/). If the phase is pi...
  10. J

    Why isn't kinetic energy considered a fundamental force like the other four?

    I understand why you might be frustrated with the answers your getting here. Although they are correct they aren't helping you understand why. I will make the suggestion that posting your question in the relevant forum section might help. This is the "quantum physics" section. It would have been...
  11. J

    Why isn't kinetic energy considered a fundamental force like the other four?

    Ok, assuming what you mean is which force transfers kinetic energy in a collision, the answer would be the electric force. The atoms in each object repel each other so rather than one object passing through another they "collide" due to electric repulsion between the electrons orbiting each...
  12. J

    The Quantum Tamers

    Thankyou. I didn't think it would be so pricey though :(
  13. J

    The Quantum Tamers

    your misinterpreting my meaning. My question is about where I can get the movie, I didn't specify anywhere it had to be from an illegal source. I'm asking for help finding it because I can't find it. If you can't find it either then fine.
  14. J

    The Quantum Tamers

    If it has been released for free then great, but I can't even find where I could order it from.
  15. J

    The Quantum Tamers

    "The Quantum Tamers" Does anyone have a link to a place I could watch "The Quantum Tamers"?
  16. J

    Fast moving batteries

    Lets say I'm in a train going the 1/2 the speed of light. I have a light source that releases signal photons. I aim the light source in the direction i'm going and release 1 photon. Now my energy supply for the lamp has decreased by hf. From a person on the platform the frequency is shifted...
  17. J

    What are the best lines of reasoning for why nothing can travel faster than c

    Even if it appears in a Lorentz-boosted frame that B occurs before A, that does not imply time travel has occurred. As a comparison if you were in battle and someone tried sniping you (and luckily misses you) you will hear the bullet hit before you here the gunshot.
  18. J

    Attosecond Tomography and Elephants

    I just read a paper about attosecond science and wavefunction tomography. This allows for "pictures" to be taken of the wavefunction of a bound electron including spatial and phase information. Is this "picture" a picture of a single electron from a certain particles wavefunction or is it...
  19. J

    Delayed Choice Bell-state Quantum Eraser

    The point about detector size actually cleared something up for me about the coherence of entangled sources. That is probably why Cthugha posts useful insights like that to help people with questions. What I don't understand is why you show up here with absolutely nothing to contribute and...
  20. J

    Delayed Choice Bell-state Quantum Eraser

    Sorry I meant interpretation of this experiment. I've listed the 3 main senarios below. 1. No polarizer at A and no quarter wave plates at B------Interference 2. No polarizer at A and quarter wave plates at B---------No Interference 3. Polarizer at A and quarter wave plates at...
  21. J

    Delayed Choice Bell-state Quantum Eraser

    What is your interpretation?
  22. J

    Questions about the Photoelectric Effect

    The wave will be absorbed only one quanta of energy (or photon) at a time so having a bigger wave won't make a difference. Maybe what your getting at is that if two photons were absorbed by the same electron then it could be ionized even though the frequency is incorrect. This may be possible...
  23. J

    Delayed Choice Bell-state Quantum Eraser

    Kyle, The problem is you seem to have a tendency to ignore experimental results that don't fit your preconceived view. For example, Cthugha provided a reference to back up a claim. And your response was.... There is nothing ambiguous about this at all. The experimental result selection...
  24. J

    Delayed Choice Bell-state Quantum Eraser

    hmm is this the one. Someone found it for me a few weeks ago.
  25. J

    Delayed Choice Bell-state Quantum Eraser

    A QWP provides 2 different speed to pass through the crystal corresponding to a fast polarization and a slow polarization. We will call these P1 and P2. If light has a random polarization then half of the photons will take the slow route and half the fast route at both slit 1 and slit 2...
  26. J

    Delayed Choice Bell-state Quantum Eraser

    It isn't the opposite look at the experiment again. The results are always based on coincidence counts. The spacing is close enough that you wouldn't get two bands, they would blur together. The polarization does have an effect for the case when QWP are in place because the coherency is...
  27. J

    Delayed Choice Bell-state Quantum Eraser

    To summarize the results: 1. No polarizer at A and no quarter wave plates at B------Interference 2. No polarizer at A and quarter wave plates at B---------No Interference 3. Polarizer at A and quarter wave plates at B------------Interference depending on angle of Polarizer My...
  28. J

    Delayed Choice Bell-state Quantum Eraser

    i'm going to post the paper for the experiment being discussed because the OP's link seems to be broken. http://arxiv.org/PS_cache/quant-ph/pdf/0106/0106078v1.pdf http://grad.physics.sunysb.edu/~amarch/Walborn.pdf [Broken]
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