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21 May 2015 Secret key generation via a modified quantum secret sharing protocol
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We present and experimentally show a novel protocol for distributing secret information between two and only two parties in a N-party single-qubit Quantum Secret Sharing (QSS) system. We demonstrate this new algorithm with N = 3 active parties over ~6km of telecom. fiber. Our experimental device is based on the Clavis2 Quantum Key Distribution (QKD) system built by ID Quantique but is generalizable to any implementation. We show that any two out of the N parties can build secret keys based on partial information from each other and with collaboration from the remaining N − 2 parties. This algorithm allows for the creation of two-party secret keys were standard QSS does not and significantly reduces the number of resources needed to implement QKD on a highly connected network such as the electrical grid.
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A. M. Smith, P. G. Evans, B. Lawrie, M. Legré, P. Lougovski, W. Ray, B. P. Williams, B. Qi, and W. P. Grice "Secret key generation via a modified quantum secret sharing protocol", Proc. SPIE 9500, Quantum Information and Computation XIII, 950008 (21 May 2015);

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