Pre- and post-selection paradoxes in quantum walks
| Autor: | Mikolaj Lewandowski, T. Kopyciuk, Paweł Kurzyński |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quantum Physics FOS: Physical sciences General Physics and Astronomy Mathematical proof 01 natural sciences 010305 fluids & plasmas Kochen–Specker theorem Theoretical physics Argument 0103 physical sciences Selection (linguistics) Quantum walk Quantum Physics (quant-ph) 010306 general physics Quantum Pre and post |
| Popis: | Many features of single-partite quantum walks can be simulated by classical waves. However, it was recently experimentally shown that some temporal sequences of measurements on a quantum walker do not admit a classical description in terms of macro-realistic theories. Here, we extend this observation and present pre- and post-selection scenarios in quantum walks leading to logical paradoxes. Such paradoxes were recently shown to be equivalent to proofs of contextuality, therefore we provide an additional argument for non-classicality of a quantum walk model. The assumptions behind the claims of non-classicality (including contextuality and violations of macro-realism) are also discussed. 18 pages, 4 figures, comments welcome. This work was originally planed to be an extension of arXiv:1812.00624 (partial overlap of introduction part), however while working on it we found completely new results and departed from the original work |
| Databáze: | OpenAIRE |
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