Using Separable Bell-Diagonal States to Distribute Entanglement

Details Using Separable Bell-Diagonal States to Distribute Entanglement Using Separable Bell-Diagonal States to Distribute Entanglement

2012-04-02

arxiv.org/abs/1204.0366v3

Physics

Quantum Physics

4 pages. v3: improved context with prior works

Scientific paper

One of the many bizarre features of entanglement is that Alice, by sending a qubit to Bob in a separable state, can generate some entanglement between herself and Bob. We strip this protocol down to the bare essentials, allowing us to focus on the key properties of the initial resource state that enable this entanglement distribution. We prove the necessary and sufficient conditions under which the correlations of a Bell-diagonal state serve as a useful resource, giving upper and lower bounds on the entanglement that can be distributed when those conditions are met.

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