Remarks on 2-q-bit states

Details Remarks on 2-q-bit states Remarks on 2-q-bit states

2000-07-17

arxiv.org/abs/quant-ph/0007053v1

Applied Physics B, vol. 72, 2001, pp. 35-42

Physics

Quantum Physics

17 pages

Scientific paper

We distinguish six classes of families of locally equivalent states in a straightforward scheme for classifying all 2-q-bit states; four of the classes consist of two subclasses each. The simple criteria that we stated recently for checking a given state's positivity and separability are justified, and we discuss some important properties of Lewenstein-Sanpera decompositions. An upper bound is conjectured for the sum of the degree of separability of a 2-q-bit state and its concurrence.

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