Jesus in John 8 told us this 2000 years ago:
"Then spake Jesus again unto them, saying, I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life."
Now that he's given us the topic of light, he then goes into quantum mechanics in verse 13 and 14.
Basically the point is that if you know "which path" or where the particle is coming from and going, then you can know the position of the photon because the wave function collapses. If you don't then it is a probability equation and you can't.
verses 13 and 14:
"The Pharisees therefore said unto him, Thou bearest record of thyself; thy record is not true. Jesus answered and said unto them, Though I bear record of myself, yet my record is true: for I know whence I came, and whither I go; but ye cannot tell whence I come, and whither I go."
Read on in the chapter when Jesus then tackles the issue of entanglement where the knowledge of the quantum numbers of one of the entangled pair particle causes one to then know the other - of course if they had a common beginning or came from one another:
"I am one that bear witness of myself, and the Father that sent me beareth witness of me. Then said they unto him, Where is thy Father? Jesus answered, Ye neither know me, nor my Father: if ye had known me, ye should have known my Father also."