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It is experimentally demonstrated that an arbitrary quantum state of a singlespin 1/2: a|u> + b|d> can be converted into a superposition of the twoferromagnetic states of a spin cluster: a|uu...uu> + b|dd...dd>. The physicalsystem is a cluster of seven dipolar-coupled nuclear spins of single-labeled13C-benzene molecules in a liquid-crystalline matrix. In this complex system,the pseudopure ground state and the required controlled unitary transformationshave been implemented. The experimental scheme can be considered as an explicitmodel of quantum measurement.Comment: 9 pages, 3 figure

Experimental Demonstration of Quantum State Expansion in a Cluster of Dipolar-Coupled Nuclear Spins