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Multi-Party Quantum Communication Complexity with Routed Messages

Seiichiro TANI, Masaki NAKANISHI, Shigeru YAMASHITA

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Summary :

This paper describes a general quantum lower bounding technique for the communication complexity of a function that depends on the inputs given to two parties connected via paths, which may be shared with other parties, on a network of any topology. The technique can also be employed to obtain a lower-bound of the quantum communication complexity of some functions that depend on the inputs distributed over all parties on the network. As a typical application, we apply our technique to the distinctness problem of deciding whether there are a pair of parties with identical inputs, on a k-party ring; almost matching upper bounds are also given.

Publication
IEICE TRANSACTIONS on Information Vol.E92-D No.2 pp.191-199
Publication Date
2009/02/01
Publicized
Online ISSN
1745-1361
DOI
10.1587/transinf.E92.D.191
Type of Manuscript
Special Section PAPER (Special Section on Foundations of Computer Science)
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