Separability of entangled q-bit pairs

Details Separability of entangled q-bit pairs Separability of entangled q-bit pairs

1999-12-18

arxiv.org/abs/quant-ph/9912089v2

Journal of Modern Optics, vol. 47, 2000, pp. 2221-2231

Physics

Quantum Physics

Scientific paper

The state of an entangled q-bit pair is specified by 15 numerical parameters that are naturally regarded as the components of two 3-vectors and a $3\times3$-dyadic. There are easy-to-use criteria to check whether a given pair of 3-vectors plus a dyadic specify a 2-q-bit state; and if they do, whether the state is entangled; and if it is, whether it is a separable state. Some progress has been made in the search for analytical expressions for the degree of separability. We report, in particular, the answer in the case of vanishing 3-vectors.

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