  In this article, we present a detailed analysis of two famous delayed choice
experiments: Wheeler's classic gedanken-experiment and the delayed quantum
eraser. Our analysis shows that the outcomes of both experiments can be fully
explained on the basis of the information collected during the experiments
using textbook quantum mechanics only. At no point in the argument, information
from the future is needed to explain what happens next. In fact, more is true:
for both experiments, we show, in a strictly mathematical way, that a modified
version in which the time-ordering of the steps is changed to avoid the delayed
choice leads to exactly the same final state. In this operational sense, the
scenarios are completely equivalent in terms of conclusions that can be drawn
from their outcomes.
