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What does |0> mean? ie what does the | > mean/do?

  1. Nov 26, 2006 #1

    Lee

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    What does |0> mean? ie what does the | > mean/do?
     
  2. jcsd
  3. Nov 26, 2006 #2

    Hurkyl

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    | > is just a decoration; it makes something look different. It's no different than when you put a little arrow over your vectors, or little hats over your unit vectors.
     
  4. Nov 26, 2006 #3

    Lee

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    Ah, right. I thought it was maybe linked to < > meaning expectation value.
     
  5. Nov 26, 2006 #4

    selfAdjoint

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    Well when you take the inner product of <x| with |x> you get <x|x>, which is a number and can be thought of as an expecttion. So the notation ("Bra and ket") isn't entirely arbitrary.
     
  6. Nov 27, 2006 #5

    dextercioby

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    [itex] |0\rangle [/itex] stands for the ground state for a quantum system (the state with the minimum possible energy). The [itex] |\rangle [/itex] with "something" in between the vertical line and the angle means that the "something" is a "ket" vector.

    Daniel.
     
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