It is well known that in a two-slit interference experiment, if the information, on which of the two paths the particle followed, is stored in a quantum path detector, the interference is destroyed. However, in a set-up where this path information is a??eraseda??, the interference can reappear. Such a set-up is known as a quantum eraser. A generalization of quantum eraser to a a??three-slita?? interference is theoretically analysed. It is shown that three complementary interference patterns can arise out of the quantum erasing process.
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