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Preparation of general single-ququart states using ultrafast spontaneous parametric down-conversion

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Abstract

We report an experiment on preparing general four-dimensional quantum states (ququart) using ultrafast-pumped frequency-nondegenerate spontaneous parametric down-conversion. All possible single-ququart states (mixed, pure, and intermediate states) can be prepared in our scheme.

© 2007 Optical Society of America

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