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What role does quantum entanglement play in quantum computers?

  1. Dec 1, 2013 #1
    I've been reading about quantum entanglement, and I read in many websites that it plays a very important role on quantum computers. I tried to find why, but the only information I got was that quantum entanglement allowed us to see the value of a qubit without interacting directly with it (and changing it as a consequence). Is this the only contribution quantum entanglement has to offer quantum computers?
    I've been trying to find an answer on the web, but I couldn't find any specific information. I suspect that quantum entanglement is related to the inherent parallelism on quantum computers, but I'm not sure about that either...

    All answers would be appreciated.
  2. jcsd
  3. Dec 1, 2013 #2
    I think it because each bit rather than being 0 or 1 can exist in a superposition of both. This would mean that the speed of calculations could be speeded up greatly. Consider the number of possible outcomes after 3 steps. With the normal bit you have 2x2x2=8, but with the quibit you have, 4x4x4=64 and with more steps the greater the ratio.
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