MultiqubitWstates lead to stronger nonclassicality than Greenberger-Horne-Zeilinger states
- 9 December 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 68 (6) , 062306
- https://doi.org/10.1103/physreva.68.062306
Abstract
The N-qubit states of the W class, for lead to more robust (against noise admixture) violations of local realism, than the Greenberger-Horne-Zeilinger (GHZ) states. These violations are most pronounced for correlations for a pair of qubits, conditioned on specific measurement results for the remaining qubits. The considerations provide us with a qualitative difference between the W state and GHZ state in the situation when they are separately sent via depolarizing channels. For sufficiently high amount of noise in the depolarizing channel, the GHZ states cannot produce a distillable state between two qubits, whereas the W states can still produce a distillable state in a similar situation.
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