We investigate wave-particle duality in a symmetric two-way interferometer with a which-way detector. We find that it is important to state wether the interfering object or the which-way detector is read out first. In case that the interfering object is read out first, we discover that it is possible to use the information about its state to increase the distinguishability to a value which violates the widely accepted bounds set by an inequality introduced by Jaeger et al. (PRA 51, 54) and Englert (PRL 77, 2154).
@article{arxiv.1006.2037,
title = {Wave-particle duality revisited},
author = {Uwe Schilling and Joachim von Zanthier},
journal= {arXiv preprint arXiv:1006.2037},
year = {2010}
}