Re: (De)coherence

From: scerir <>
Date: Tue, 18 Nov 2003 20:14:22 +0100

Eric Cavalcanti

> Therefore interaction by itself does not cause decoherence.

If you *encode* the "welcher weg" information
you get decoherence.
- Schneider, LaPuma, Am. J. Phys., 70 (2002) 266

Leonard Mandel put it in the strongest way:
"The mere possibility, in principle, of performing
the auxiliary measurement is sufficient to
destroy the interference. The quantum state
in this case is in the form of a diagonal
density operator which reflects what is
knowable, in principle, rather than what
is known."
Found. Phys., 25 (1995) 211

About the (finite) information involved, see also
Received on Tue Nov 18 2003 - 14:57:49 PST

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