Projects per year
Abstract
In this paper, we investigate the possibility of explaining nonclassical correlations between two quantum systems in terms of quantum interferences between collective states of the two systems. We achieve this by mapping the relations between different measurement contexts in the product Hilbert space of a pair of twolevel systems onto an analogous sequence of interferences between paths in a singleparticle interferometer. The relations between different measurement outcomes are then traced to the distribution of probability currents in the interferometer, where paradoxical relations between the outcomes are identified with currents connecting two states that are orthogonal and should therefore exclude each other. We show that the relation between probability currents and correlations can be represented by continuous conditional (quasi)probability currents through the interferometer, given by weak values; the violation of the noncontextual assumption is expressed by negative conditional currents in some of the paths. Since negative conditional currents correspond to the assignment of negative conditional probabilities to measurements results in different measurement contexts, the necessity of such negative probability currents represents a failure of noncontextual local realism. Our results help to explain the meaning of nonlocal correlations in quantum mechanics, and support Feynman's claim that interference is the origin of all quantum phenomena.
Original language  English 

Article number  063021 
Number of pages  11 
Journal  New Journal of Physics 
Volume  26 
Issue number  6 
DOIs  
Publication status  Published  19 Jun 2024 
Bibliographical note
Publisher Copyright:© 2024 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
Structured keywords
 Centre for Science and Philosophy
 QETLabs
 Bristol Quantum Information Institute
 Photonics and Quantum
Fingerprint
Dive into the research topics of 'Tracing quantum correlations back to collective interferences'. Together they form a unique fingerprint.Projects
 1 Active

QComms2: 8031 EP/T001011/1 Quantum Communication Hub via York
Rarity, J. G., Nejabati, R., Simeonidou, D., Sahin, D., Kanellos, G., Aktas, D. V. C., Joshi, S. K., Lowndes, D. L. D., Venkatachalam, N., Hugues Salas, E., Woodland, E. M., Erven, C., Zhang, P., Hance, J. R., Clark, M. J. H., Rosenfeld, L. M., Hastings, E. M. J., Johlinger, F. B., Wang, R., Stange Tessinari, R., Solomons, N. R., Fasoulakis, T. & Alia, O.
1/12/19 → 30/11/24
Project: Research