Qubit Entanglement Breaking Channels
نویسنده
چکیده
This paper continues the study of stochastic maps, or channels, for which (I ⊗Φ)(Γ) is always separable in the case of qubits. We give a detailed description of entanglement-breaking qubit channels, and show that such maps are precisely the convex hull of those known as classical-quantum channels. We also review the complete positivity conditions in a canonical parameterization and show how they lead to entanglement-breaking conditions. ∗Partially supported by the National Security Agency (NSA) and Advanced Research and Development Activity (ARDA) under Army Research Office (ARO) contract numbers DAAG5598-1-0374 and DAAD19-02-1-0065, and by the National Science Foundation under Grant number DMS-0074566.
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