Superposition of macroscopically distinct states means large multipartite entanglement

Details Superposition of macroscopically distinct states means large multipartite entanglement Superposition of macroscopically distinct states means large multipartite entanglement

2009-12-17

arxiv.org/abs/0912.3338v1

Phys. Rev. A 81, 010101 (R) (2010)

Physics

Quantum Physics

6 pages, PRA Rapid, accepted

Scientific paper

10.1103/PhysRevA.81.010101

We show relations between superposition of macroscopically distinct states and entanglement. These relations lead to the important conclusion that if a state contains superposition of macroscopically distinct states, the state also contains large multipartite entanglement in terms of several measures. Such multipartite entanglement property also suggests that if a state contains superposition of macroscopically distinct states, a measurement on a single particle drastically changes the state of macroscopically many other particles, as in the case of the N-qubit GHZ state.

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