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Loss-Tolerant Quantum Coin Flipping

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4 Author(s)
Berlin, G. ; Univ. de Montreal, Montreal ; Brassard, G. ; Bussieres, F. ; Godbout, N.

Coin flipping is a cryptographic primitive in which two spatially separated players, who in principle do not trust each other, wish to establish a common random bit. If we limit ourselves to classical communication, this task requires either assumptions on the computational power of the participants or it requires them to send messages to each other with sufficient simultaneity to force their complete independence. Without such assumptions, all classical protocols are so that one dishonest player can completely bias the outcome to his choosing. If we allow for quantum communication, on the other hand, protocols have been introduced that limit the maximal bias that dishonest players can produce. However, those protocols would be very difficult to implement in practice because they cannot tolerate realistic losses on the quantum channel between the participants or in their quantum storage and measurement apparatus. In this paper, we introduce a novel quantum protocol and we prove its unconditional security even when such losses are taken into account.

Published in:

Quantum, Nano and Micro Technologies, 2008 Second International Conference on

Date of Conference:

10-15 Feb. 2008

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