On 10/16/2019 8:22 AM, John Clark wrote:
On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett <bhkellet...@gmail.com
<mailto:bhkellet...@gmail.com>> wrote:
> I/n the delayed choice experiment, the decision whether or not to
quantum erase the "which way" information can be made long after
the original photons hit the screen and make their marks there./
No. In the delayed choice experiment the decision on if to erase the
information about which slit the photon went through can be made after
the photon passes through the slit, even billions of years after, but
it must be made while the photon still exists and is inflight not
after it hits the screen.
I thought you read Carroll's book. His example shows in what sense you
can erase the information after the photon has hit the screen.
Brent
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