A measurable entanglement criterion for two qubits

Details A measurable entanglement criterion for two qubits A measurable entanglement criterion for two qubits

2003-08-18

arxiv.org/abs/quant-ph/0308091v3

Phys. Rev. A, vol. 68, pp. 062314/1-4, 2003

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.68.062314

We propose a directly measurable criterion for the entanglement of two qubits. We compare the criterion with other criteria, and we find that for pure states, and some mixed states, it coincides with the state's concurrency. The measure can be obtained with a Bell state analyser and the ability to make general local unitary transformations. However, the procedure fails to measure the entanglement of a general mixed two-qubit state.

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