Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons

Details Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons

2008-04-21

arxiv.org/abs/0804.3327v1

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.78.042321

We report interferometric schemes to prepare arbitrary states of four-dimensional qudits (ququarts) based on biphoton states of ultrafast-pumped frequency-nondegenerate spontaneous parametric down-conversion. Preparation and tomographic characterization of a few examples of general single-ququart states, a pure state, a completely mixed state, and a partially-mixed state, are experimentally demonstrated.

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