Abstract
It is experimentally demonstrated that a quantum state, destroyed by uncontrollable natural decoherence, can be purified by using results of projective measurement and converted into a desired target pure state. The physical system is a cluster of seven dipolar-coupled nuclear spins of single-labelled 13C-benzene in liquid crystal. 13C spin plays the role of a device for measuring the protons' ‘cat’ state, a superposition of states with six spins up (alive) and six spins down (dead). Information about the state, stored in the 13C spin, is used to bring the protons' subsystem into the target alive state, while the excess entropy produced by decoherence is transferred to the ‘measuring device’, the 13C spin.
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