Decoherence of a Greenberger-Horne-Zeilinger state in a five-qubit NMR quantum computer

摘要

This work provides a simple approximate method of creating a Greenberger-Horne-Zeilinger (GHZ) state with high fidelity, using nuclear magnetic resonance (NMR) techniques, and reports on the decoherence process for these GHZ states, which is observed with a pair of encoder and decoder quantum circuits. The prepared GHZ states are verified by measuring the quantum correlations, which are well known as GHZ correlations. The results of the decoherence experiments, show that the GHZ states decay faster than bipartite entangled states such as Bell states by a factor of 1.3, and it appears that two different decoherence processes exist. 2006 Wiley Periodicals, Inc.