Geometric Discord of GHZ State under Decoherence

Geometric discord is an essential method to measure quantum correlations. It is significative to investigate how geometric discord of GHZ state is affected under decoherence channels (phase flip, bit flip and bit-phase flip channels). It indicates that geometric discord of GHZ state decreases with time and eventually approaches to a stable value under decoherence channels. Especially under bit flip and bit-phase flip channels, their change trends of geometric discord are exactly the same. By comparing the variation trend of geometric discord of GHZ state under three decoherence channels, it can be concluded that quantum correlations are most affected under phase flip channel, that is, the decoherence ability of GHZ state to resist phase flip noise environment is weaker.