Separability of entangled q-bit pairs

Abstract

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 $3\times 3$-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.

References in corpus (2)

• Operationally Invariant Information in Quantum Measurements
• Quantitative wave-particle duality and non-erasing quantum erasure

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