Robustness of Multi-Party Entanglement

Details Robustness of Multi-Party Entanglement Robustness of Multi-Party Entanglement

2001-09-20

arxiv.org/abs/quant-ph/0109102v1

Phys. Rev. A, Vol. 65 (5), 052327 (2002)

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevA.65.052327

How common is large-scale entanglement in nature? As a first step towards addressing this question, we study the robustness of multi-party entanglement under local decoherence, modeled by partially depolarizing channels acting independently on each subsystem. Surprisingly, we find that n-qubit GHZ entanglement can stand more than 55 % local depolarization in the limit of n going to infinity, and that GHZ states are more robust than other generic states of 3 and 4 qubits. We also study spin-squeezed states in the limit n going to infinity and find that they too can stand considerable local depolarization.

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