Entanglement verification with finite data

Details Entanglement verification with finite data Entanglement verification with finite data

2010-04-30

arxiv.org/abs/1005.0003v1

Phys. Rev. Lett. 105, 170501 (2010)

Physics

Quantum Physics

4 pages, 3 pretty pictures

Scientific paper

10.1103/PhysRevLett.105.170501

Suppose an experimentalist wishes to verify that his apparatus produces entangled quantum states. A finite amount of data cannot conclusively demonstrate entanglement, so drawing conclusions from real-world data requires statistical reasoning. We propose a reliable method to quantify the weight of evidence for (or against) entanglement, based on a likelihood ratio test. Our method is universal in that it can be applied to any sort of measurements. We demonstrate the method by applying it to two simulated experiments on two qubits. The first measures a single entanglement witness, while the second performs a tomographically complete measurement.

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