Necessary and sufficient criterion for extremal quantum correlations in the simplest Bell scenario
| Autor: | Satoshi Ishizaka |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Quantum Physics Quantum instrument Quantum correlation FOS: Physical sciences 01 natural sciences Upper and lower bounds Outcome (probability) Coincidence 010305 fluids & plasmas Quantum nonlocality Bounded function 0103 physical sciences Statistical physics 010306 general physics Quantum Physics (quant-ph) Quantum |
| DOI: | 10.48550/arxiv.1712.08419 |
| Popis: | In the study of quantum nonlocality, one obstacle is that the analytical criterion for identifying the boundaries between quantum and postquantum correlations has not yet been given, even in the simplest Bell scenario. We propose a plausible, analytical, necessary and sufficient condition ensuring that a nonlocal quantum correlation in the simplest scenario is an extremal boundary point. Our extremality condition amounts to certifying an information-theoretical quantity; the probability of guessing a measurement outcome of a distant party optimized using any quantum instrument. We show that this quantity can be upper and lower bounded from any correlation in a device-independent way, and we use numerical calculations to confirm that coincidence of the upper and lower bounds appears to be necessary and sufficient for the extremality. Comment: published version, 8 pages, 4 figures |
| Databáze: | OpenAIRE |
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