Security Trade-offs in Ancilla-Free Quantum Bit Commitment in the Presence of Superselection Rules

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Security trade-offs have been established for one-way bit commitment in quant-ph/0106019. We study this trade-off in two superselection settings. We show that for an `abelian' superselection rule (exemplified by particle conservation) the standard trade-off between sealing and binding properties still holds. For the non-abelian case (exemplified by angular momentum conservation) the security trade-off can be more subtle, which we illustrate by showing that if the bit-commitment is forced to be ancilla-free an asymptotically secure quantum bit commitment is possible.
7 pages Latex; v2 has 8 pages and additional references and clarifications, this paper is to appear in the New Journal of Physics

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/96476

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0405111
 http://arxiv.org/abs/quant-ph/0405111
 New Journal of Physics 6, 80 (2004)
 doi:10.1088/1367-2630/6/1/080

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arXiv