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QI: Fachverband Quanteninformation
QI 2: Quantum Foundations
QI 2.3: Vortrag
Montag, 6. März 2023, 11:30–11:45, B302
What aspects of the phenomenology of interference witness nonclassicality? — •Lorenzo Catani1, Matthew Leifer2, Giovanni Scala3, David Schmid3, and Robert Spekkens4 — 1Technische Universitaet Berlin — 2Chapman University — 3University of Gdansk — 4Perimeter Institute for Theoretical Physics
Interference phenomena are often claimed to resist classical explanation. However, such claims are undermined by the fact that the specific aspects of the phenomenology upon which they are based can in fact be reproduced in a noncontextual ontological model [Catani et al. arXiv:2111.13727]. This raises the question of what other aspects of the phenomenology of interference do in fact resist classical explanation. We answer this question by demonstrating that the most basic quantum wave-particle duality relation, which expresses the precise trade-off between path distinguishability and fringe visibility, cannot be reproduced in any noncontextual model. We do this by showing that it is a specific type of uncertainty relation, and then leveraging a recent result establishing that noncontextuality restricts the functional form of this uncertainty relation [Catani et al. arXiv:2207.11779]. Finally, we discuss what sorts of interferometric experiment can demonstrate contextuality via the wave-particle duality relation.