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Using an NMR quantum computer, we experimentally simulate the quantum phasetransition of a Heisenberg spin chain. The Hamiltonian is generated by amultiple pulse sequence, the nuclear spin system is prepared in its(pseudo-pure) ground state and the effective Hamiltonian varied in such a waythat the Heisenberg chain is taken from a product state to an entangled stateand finally to a different product state.Comment: 5 pages, 5 eps figures. Accepted in Phys. Rev.

Quantum phase transition of ground-state entanglement in a Heisenberg spin chain simulated in an NMR quantum computer