Propose this measurement: It is a well know interference measurement, but now asymmetrical. Suppose the red path is 1 m and the blue path 10 m. If you measure the time between detector 1 and 2 I expect you will find two times: 3.3 ns and 33 ns. Then you know which path the photon took. But between BBO source and detector 2 the photons are not disturbed, so according Feynman rules there will be interference. Who know what is wrong here, because QM predicts different.