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Title: Wave-particle duality in multi-path interferometers: General concepts and three-path interferometers
Authors: Englert, B.-G. 
Kaszlikowski, D. 
Kwek, L.C. 
Chee, W.H.
Keywords: Interference strength
Path knowledge
Wave-particle duality
Issue Date: Feb-2008
Citation: Englert, B.-G., Kaszlikowski, D., Kwek, L.C., Chee, W.H. (2008-02). Wave-particle duality in multi-path interferometers: General concepts and three-path interferometers. International Journal of Quantum Information 6 (1) : 129-157. ScholarBank@NUS Repository.
Abstract: For two-path interferometers, the which-path predictability P and the fringe visibility ν are familiar quantities that are much used to talk about wave-particle duality in a quantitative way. We discuss several candidates that suggest themselves as generalizations P of P for multi-path interferometers, and treat the case of three paths in considerable detail. To each choice for the path knowledge P , the interference strength V - the corresponding generalization of ν - is found by a natural, operational procedure. In experimental terms, it amounts to finding those equal-weight superpositions of the path amplitudes which maximize P for the emerging intensities. Mathematically speaking, one needs to identify a certain optimum one among the Fourier transforms of the state of the interfering quantum object. Wave-particle duality is manifest, inasmuch as P = 1 implies V = 0 and V = 1 implies P = 0, whatever definition is chosen. The possible values of the pair (P,V) are restricted to an area with corners at (P,V) = (0,0) , (P,V) = (1,0), and (P,V) = (0,1) , with the shape of the border line from (1,0) to (0,1), depending on the particular choice for P and the induced definition of V. © 2008 World Scientific Publishing Company.
Source Title: International Journal of Quantum Information
ISSN: 02197499
DOI: 10.1142/S0219749908003220
Appears in Collections:Staff Publications

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