On 12/5/2012 10:53 AM, John Clark wrote:
Yes that other photon could give which-way information and if it still exists when its
twin hits the photographic plate (or electronic detector) no interference pattern will
form. But if quantum erasure is used to destroy the which-way information the photon has
then its twin WILL construct a interference pattern.
OK, I believe you understand the physics. But your account, and the quotations from the
papers, implicitly foster this false dichotomy, an exclusive or between the which-way
particle existing or the information being erased. Destroying the particle (e.g.
absorbing an electron into a metal - which was your original example) is NOT an example of
the information being erased. The exclusive or is between the information being available
and the information being erased.
You received this message because you are subscribed to the Google Groups
"Everything List" group.
To post to this group, send email to email@example.com.
To unsubscribe from this group, send email to
For more options, visit this group at