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Homework Help: Normalising qbits states

  1. Mar 1, 2013 #1
    1. The problem statement, all variables and given/known data
    I have a three qbit state:
    [itex](a|00> + b|11>)\bigotimes(c|0>+d|1>) [/itex]
    and I need to normalise it, I realise that I could deconstruct it into matrices and work it though and solve it but there must be a more efficient way.
    2. Relevant equations

    3. The attempt at a solution
    I am unsure really how to proceed from here, I kow that to normalise one does [itex] <\psi|\psi>=1 [/itex] but I am confused because this is a 3 qbit state, would it simply be [itex] ac(ac)^{*} + ad(da)^{*} + bc(cb)^{*} + bd(db)^{*}=1[/itex]?.
  2. jcsd
  3. Mar 4, 2013 #2
    Looks right to me :smile:

    You just multiply together the inner products from the two spaces.
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