Weak coin flipping with small bias

Details Weak coin flipping with small bias Weak coin flipping with small bias

2002-06-19

arxiv.org/abs/quant-ph/0206121v2

Physics

Quantum Physics

Results unchanged. Few comments and references added

Scientific paper

This note presents a quantum protocol that demonstrates that_weak_ coin flipping with bias approximately 0.239, less than 1/4, is possible. A bias of 1/4 was the smallest known, and followed from the strong coin flipping protocol of [Ambainis 2001]. Protocols with yet smaller bias, approximately 0.207, have independently been discovered [Ambainis 2001, Spekkens and Rudolph 2002]. We also present an alternative strong coin flipping protocol with bias 1/4 with analysis simpler than that of [Ambainis 2001].

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