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Remarks on 2-q-bit states
Berthold-Georg Englert, Nasser Metwally
abstract: 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.
- oai_identifier:
- oai:arXiv.org:quant-ph/0007053
- categories:
- quant-ph
- comments:
- 17 pages
- arxiv_id:
- quant-ph/0007053
- journal_ref:
- Applied Physics B, vol. 72, 2001, pp. 35-42
- created:
- 2000-07-17
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