1 - Here follows a GHZ entangled state, that is
| (1) | |GHZ> = | 1 &radic 2 |
(|000>+|111>) |
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2 - Here is a W state, that is
| (2) | |W> = | 1 &radic 3 |
(|100>+|010>+|001>) |
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Note: the n partite W state can be built as an iteration of bipartite entanglements:
| (3) | |Wn+1> = | &radic n &radic n+1 |
(|Wn>&otimes |0> + |0...0>&otimes|1>) |
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it is not so for the GHZ state which collapses to a separable state when one single measurement is made:
| (4) | |GHZn> &rarr | |0...0> or |1...1> |
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