Quantitative complementarity between local and nonlocal character of quantum states in a three-qubit system

Details Quantitative complementarity between local and nonlocal character of quantum states in a three-qubit system Quantitative complementarity between local and nonlocal character of quantum states in a three-qubit system

2008-11-18

arxiv.org/abs/0811.2907v1

Phys. Rev. A 77, 052107 (2008)

Physics

Quantum Physics

10 pages, 10 figures

Scientific paper

10.1103/PhysRevA.77.052107

Local or nonlocal character of quantum states can be quantified and is subject to various bounds that can be formulated as complementarity relations. Here, we investigate the local vs. nonlocal character of pure three-qubit states by a four-way interferometer. The complete entanglement in the system can be measured as the entanglement of a specific qubit with the subsystem consisting of the other two qubits. The quantitative complementarity relations are verified experimentally in an NMR quantum information processor.

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