|
related topics |
{key, protocol, security} |
{alice, bob, state} |
{states, state, optimal} |
{error, code, errors} |
{state, states, entangled} |
{entanglement, phys, rev} |
{information, entropy, channel} |
{cos, sin, state} |
|
Dilemma that cannot be resolved by biased quantum coin flipping
Satoshi Ishizaka
abstract: We show that a biased quantum coin flip (QCF) cannot provide the performance
of a black-boxed biased coin flip, if it satisfies some fidelity conditions.
Although such a QCF satisfies the security conditions of a biased coin flip, it
does not realize the ideal functionality, and therefore, does not fulfill the
demands for universally composable security. Moreover, through a comparison
within a small restricted bias range, we show that an arbitrary QCF is
distinguishable from a black-boxed coin flip unless it is unbiased on both
sides of parties against insensitive cheating. We also point out the difficulty
in developing cheat-sensitive quantum bit commitment in terms of the
uncomposability of a QCF.
- oai_identifier:
- oai:arXiv.org:quant-ph/0703099
- categories:
- quant-ph
- comments:
- 5 pages and 1 figure. Accepted version
- doi:
- 10.1103/PhysRevLett.100.070501
- arxiv_id:
- quant-ph/0703099
- journal_ref:
- Phys. Rev. Lett. 100, 070501 (2008)
- created:
- 2007-03-13
- updated:
- 2008-01-11
Full article ▸
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