In a two-particle interferometer, one can study the variation of both single-and joint-detection probabilities as functions of the phase shifts of the beams. By combining the usual definition for one-particle fringe visibility u; (i =1,2) with a reasonable proposed definition for two-particle fringe visibility u», we show that v; +v»~1 or, equivalently, u; u»~2. Some extensions are discussed.
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