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.
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