title: Information-theoretic approach to single-particle and two-particle interference in multipath interferometers.
abstract: We propose entropic measures for the strength of single-particle and two-particle interference in interferometric experiments where each particle of a pair traverses a multipath interferometer. Optimal single-particle interference excludes any two-particle interference, and vice versa. We report an inequality that states the compromises allowed by quantum mechanics in intermediate situations, and identify a class of two-particle states for which the upper bound is reached. Our approach is applicable to symmetric two-partite systems of any finite dimension.
authors.affiliation: Department of Physics, National University of Singapore, Singapore 117 542, Singapore.
authors.forename: Dagomir
authors.initials: D
authors.lastname: Kaszlikowski
authors.forename: Leong Chuan
authors.initials: LC
authors.lastname: Kwek
authors.forename: Marek
authors.initials: M
authors.lastname: Zukowski
authors.forename: Berthold-Georg
authors.initials: BG
authors.lastname: Englert