Experimental quantum tossing of a single coin

Details Experimental quantum tossing of a single coin Experimental quantum tossing of a single coin

2008-04-28

arxiv.org/abs/0804.4411v1

Physics

Quantum Physics

13 pages

Scientific paper

10.1088/1367-2630/10/8/083037

The cryptographic protocol of coin tossing consists of two parties, Alice and Bob, that do not trust each other, but want to generate a random bit. If the parties use a classical communication channel and have unlimited computational resources, one of them can always cheat perfectly. Here we analyze in detail how the performance of a quantum coin tossing experiment should be compared to classical protocols, taking into account the inevitable experimental imperfections. We then report an all-optical fiber experiment in which a single coin is tossed whose randomness is higher than achievable by any classical protocol and present some easily realisable cheating strategies by Alice and Bob.

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