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Self-testing entangled measurements in quantum networks

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arxiv 1807.04956 v2 pith:CSONCGWJ submitted 2018-07-13 quant-ph

Self-testing entangled measurements in quantum networks

classification quant-ph
keywords entangledmeasurementsquantumself-testingnaturalnetworksapproachassumption
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Self-testing refers to the possibility of characterizing an unknown quantum device based only on the observed statistics. Here we develop methods for self-testing entangled quantum measurements, a key element for quantum networks. Our approach is based on the natural assumption that separated physical sources in a network should be considered independent. This provides a natural formulation of the problem of certifying entangled measurements. Considering the setup of entanglement swapping, we derive a robust self-test for the Bell-state measurement, tolerating noise levels up to 5%. We also discuss generalizations to other entangled measurements.

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