Quantum state expansion

Details Quantum state expansion Quantum state expansion

2005-01-21

arxiv.org/abs/quant-ph/0501123v1

Physical Review Letters 94, 150504 (2005)

Physics

Quantum Physics

9 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.150504

It is experimentally demonstrated that an arbitrary quantum state of a single spin 1/2: a|u> + b|d> can be converted into a superposition of the two ferromagnetic states of a spin cluster: a|uu...uu> + b|dd...dd>. The physical system is a cluster of seven dipolar-coupled nuclear spins of single-labeled 13C-benzene molecules in a liquid-crystalline matrix. In this complex system, the pseudopure ground state and the required controlled unitary transformations have been implemented. The experimental scheme can be considered as an explicit model of quantum measurement.

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