Physics – Quantum Physics
Scientific paper
2002-06-19
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].
Kerenidis Iordanis
Nayak Ashwin
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