#### DrChinese

Science Advisor

Gold Member

- 7,181

- 999

This is a subject of great debate, and no one knows the answer definitively. That is because the mechanism by which an entangled system of 2 particles evolves into 2 independent systems (no longer entangled) is unknown. The quantum prediction is probabilistic, and depends primarily what is called the "context". The context then consists of 3 main factors:PeroK thanks, I would still like your reply to the questions I asked:

1. Was Alice’s measurement affected by Bob’s measurement an hour later?

2. Was Bob’s Measurement affected by Alice’s measurement an hour earlier?

a. The type of entanglement the system is cast into (for example: correlated or anti-correlated).

b. Alice's choice of measurement (for example: spin angle).

c. Bob's choice of measurement (for example: spin angle).

The order of the above does not matter to the quantum mechanical prediction. And each measurement outcome (when viewed alone) is completely random. So you can see why the answer is elusive. Of course, you can make assumptions - but those assumptions cannot be verified objectively.