They can write their result on two pieces of paper and bring them together. But as long as we treat perspective as fundamental, there still won’t be any non-locality. Because the spins are perceived by actions upon a perspective center. And those actions cannot be spacelike separated. For example, if the two pieces of paper are sent to me, from my perspective all I can say is something like “since I got Alice’s result as spin up, safe to say I will get Bob’s result as spin down.” Non-local correlations like “Alice measured up, so Bob will measure down” is either a perspective switch between the two or a view from nowhere statement.
I agree that measurements are objective once made (in the sense of perspective-invariant not perspective-independent). But Alice and Bob are not analyzing the same set of measurements. Each of them from their respective perspective analyzes actions upon him/herself. Their deduction about the spins would have opposite causal arrows. But as long as we don’t switch perspectives, things would be local.
They can write their result on two pieces of paper and bring them together. But as long as we treat perspective as fundamental, there still won’t be any non-locality.
Nonocality is more than one thing. The correlation I spoke of continue to exist even if your metaphysics say they can’t.
That’s fair. I think it would be beyond my expertise to criticize other notions of correlational non-locality. I just wanted to point once treating perspectives as fundamental, the non-locality cannot be formulated in QM. Somewhat similar to QBism’s treatment of nonlocality.
No. They just need to write down their observations on two strips of paper, and bring them together .
Its an important feature of QM that measurements are pretty much objective and classical once you have made them.
They can write their result on two pieces of paper and bring them together. But as long as we treat perspective as fundamental, there still won’t be any non-locality. Because the spins are perceived by actions upon a perspective center. And those actions cannot be spacelike separated. For example, if the two pieces of paper are sent to me, from my perspective all I can say is something like “since I got Alice’s result as spin up, safe to say I will get Bob’s result as spin down.” Non-local correlations like “Alice measured up, so Bob will measure down” is either a perspective switch between the two or a view from nowhere statement.
I agree that measurements are objective once made (in the sense of perspective-invariant not perspective-independent). But Alice and Bob are not analyzing the same set of measurements. Each of them from their respective perspective analyzes actions upon him/herself. Their deduction about the spins would have opposite causal arrows. But as long as we don’t switch perspectives, things would be local.
Nonocality is more than one thing. The correlation I spoke of continue to exist even if your metaphysics say they can’t.
That’s fair. I think it would be beyond my expertise to criticize other notions of correlational non-locality. I just wanted to point once treating perspectives as fundamental, the non-locality cannot be formulated in QM. Somewhat similar to QBism’s treatment of nonlocality.