2019-08-19T22:54:46Z
https://digital.csic.es/dspace-oai/request
oai:digital.csic.es:10261/130506
2016-10-20T09:17:43Z
com_10261_14181
com_10261_4
col_10261_14182
What dynamics can be expected for mixed states in two-slit experiments?
Luis, A.
Sanz, Ángel S.
Ministerio de Ciencia e Innovación (España)
Ministerio de Economía y Competitividad (España)
Bohmian mechanics
Mixed state
Young two-slit experiment
Weak measurement
Phase incoherence
13 págs.; 3 figs.
© 2015 Elsevier Inc. Weak-measurement-based experiments (Kocsis etal., 2011) have shown that, at least for pure states, the average evolution of independent photons in Young's two-slit experiment is in compliance with the trajectories prescribed by the Bohmian formulation of quantum mechanics. But, what happens if the same experiment is repeated assuming that the wave function associated with each particle is different, i.e., in the case of mixed (incoherent) states? This question is investigated here by means of two alternative numerical simulations of Young's experiment, purposely devised to be easily implemented and tested in the laboratory. Contrary to what could be expected a priori, it is found that even for conditions of maximal mixedness or incoherence (total lack of interference fringes), experimental data will render a puzzling and challenging outcome: the average particle trajectories will still display features analogous to those for pure states, i.e., independently of how mixedness arises, the associated dynamics is influenced by both slits at the same time. Physically this simply means that weak measurements are not able to discriminate how mixedness arises in the experiment, since they only provide information about the averaged system dynamics.
2015-04-07
2016-03-29T10:00:16Z
Pre-print
Annals of Physics 357: 95-107 (2015)
http://hdl.handle.net/10261/130506
10.1016/j.aop.2015.03.030
http://dx.doi.org/10.13039/501100004837
http://dx.doi.org/10.13039/501100003329
eng
Preprint
http://dx.doi.org/10.1016/j.aop.2015.03.030
Sí
MICINN/FIS2011-29596-C02-01
MINECO/FIS2012-35583
openAccess
Academic Press