Phys. Rev. Lett. 77, 2154–2157 (1996)Fringe Visibility and Which-Way Information: An InequalityReceived 21 May 1996; published in the issue dated 9 September 1996 An inequality is derived according to which the fringe visibility in a two-way interferometer sets an absolute upper bound on the amount of which-way information that is potentially stored in a which-way detector. In some sense, this inequality can be regarded as quantifying the notion of wave-particle duality. The derivation of the inequality does not make use of Heisenberg's uncertainty relation in any form. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.2154
DOI:
10.1103/PhysRevLett.77.2154
PACS:
03.65.Bz
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