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It is well known that in a double-slit experiment with single photon source, one can not obtain the which-way info and interference pattern at the same time, since a detector placed behind one slit would "destroy" the interference. So instead of a detector which annihilate a photon, one could place a cavity in the path, which provide optical gain or amplification, thus by comparing the intensity on the screen where interference patterns lie, one might determine the which-way info without losing interference, thereby circumvent the limitation of complimentary principle.

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Hi Tao - you're just making a statement here, not asking a question. If you would like to edit your post to make it clear what you're actually asking, I'd be happy to reopen it. (Flag it for moderator attention if you do.) – David Zaslavsky♦ Oct 13 '12 at 23:08

closed as not a real question by David Zaslavsky♦ Oct 13 '12 at 23:07

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.