On 5/1/2018 12:40 AM, [email protected] wrote:
On Tuesday, May 1, 2018 at 6:57:14 AM UTC, scerir wrote:
*AG: 'I suppose people will appeal to entanglement and decoherence
to try to make sense of how a measurement occurs. Nevertheless, I
tend strongly to the view that the theory is inherently
irreversible; that is, TIME IRREVERSIBLE IN PRINCIPLE If so, it
implies the arrow of time has its origin at the quantum level.'*
#### Maybe.
But ... since we say that there is non-separability between
(position/momentum or time/energy) entangled quantum states, can
we also say there is quantum non-separability not just *in space*
(i.e. correlation between space-like separated events) but also
*in time* (there is no *causal* ordering)?
Are there Bell's inequalities for correlations *in time*? s.
Sure. Just make the measurements at time-like separate events. It's not
so interesting because then there could be a local (slower than light)
hidden variable that would explain the result.
https://arxiv.org/abs/1712.06884 <https://arxiv.org/abs/1712.06884>
https://arxiv.org/abs/1708.00248 <https://arxiv.org/abs/1708.00248>
*If two events are space-like separated, I think it's correct to say
there is no causal ordering. However, when analyzing time reversal for
measurements -- whether or not it exists in QM -- aren't we dealing
with time-like ordering in the laboratory wherein the "first"
measurement occurred? AG*
Spacelike events have no time order. Their order varies depending on
your choice of coordinate system.
Brent
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