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Paper Abstract and Keywords
Presentation 2019-11-19 14:50
Capacity of Quantum Private Information Retrieval with Collusion of All But One of Servers
Seunghoan Song, Masahito Hayashi (Nagoya Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Quantum private information retrieval (QPIR) is the problem to retrieve one of f classical files by downloading quantum systems from non-communicating n servers each of which contains the copy of f files, while the identity of the retrieved file is unknown to each server. As an extension, we consider the (n − 1)-private QPIR that the identity of the retrieved file is secret even if any n − 1 servers collude, and derive the QPIR capacity for this problem which is defined as the maximum rate of the retrieved file size over the download size. For an even number n of servers, we show that the capacity of the (n − 1)-private QPIR is 2/n, when we assume that there are preexisting entanglements among the servers and require that no information of the non-retrieved files is downloaded. We construct an (n − 1)-private QPIR protocol of rate ⌈n/2⌉−1 and prove that the capacity is upper bounded by 2/n. The (n − 1)-private QPIR capacity is strictly greater than the classical counterpart.
Keyword (in Japanese) (See Japanese page) 
(in English) Private information retrieval / Information-theoretic security / Entanglement swapping / / / / /  
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Conference Information
Committee QIT  
Conference Date 2019-11-18 - 2019-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Gakushuin University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2019-11-QIT 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Capacity of Quantum Private Information Retrieval with Collusion of All But One of Servers 
Sub Title (in English)  
Keyword(1) Private information retrieval  
Keyword(2) Information-theoretic security  
Keyword(3) Entanglement swapping  
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1st Author's Name Seunghoan Song  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
2nd Author's Name Masahito Hayashi  
2nd Author's Affiliation Nagoya University (Nagoya Univ.)
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Date Time 2019-11-19 14:50:00 
Presentation Time 20 minutes 
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