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- W1653354911 abstract "The quantum nature of bulk ensemble NMR quantum computing --the center of recent heated debate, is addressed. Concepts of the mixed and entanglement are examined, and the data in a 2 qubit liquid NMR quantum computation are analyzed. It is pointed out that the key problem in the current debate is the understanding of entanglement in a mixed system. The following points are concluded in this Letter: 1)Density matrix describes the state of an average particle in an ensemble. It can not describe the of an individual particle in an ensemble in detail; 2) Entanglement is a property of the wave function of a quantum particle(such as an molecule in a liquid NMR sample). Separability of the density matrix can not be used to measure the entanglement of mixed ensemble; 3)The evolution of states in bulk-ensemble NMR quantum computation is quantum mechanical; 4) The coefficient before the effective pure density matrix, $epsilon$, is an measure of the simultaneity of the molecules in an ensemble. It reflects the intensity of the NMR signal and has no significance in quantifying the entanglement in the bulk ensemble NMR system. We conclude that the liquid NMR quantum computation is genuine, not just classical simulations." @default.
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- W1653354911 date "2000-07-20" @default.
- W1653354911 modified "2023-09-27" @default.
- W1653354911 title "On the quantum mechanical nature in liquid NMR quantum computing" @default.
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