Entanglement and the geometry of two qubits
نویسندگان
چکیده
We review entanglement in the context of two qubits. Equivalence under appropriate local operations leads to a representation of the notions of entangled and separable states and entanglement witnesses geometrically in 3 dimensions. The corresponding four dimensional description captures, in addition, the entanglement measure and en-tanglement distillation geometrically. We give a neat formula for the Bell states, describe optimal distillation of two qubits and present a simple geometric proof of the Peres-Horodecki separability criterion.
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