Superselection Rules in Quantum Cryptography

Abstract

It is believed that superselection rules in quantum mechanics can restrict the possible operation on a qbit. If this was true, the model used by Mayers for the impossibility of bit commitment and by Kitaev for the impossibility of coin flipping would be inadequate. We explain why this is not the case. We show that a charge superselection rule implies no restriction on the operations that can be executed on any individual qbit.

3 revtex pages. No figure

Cited by in corpus (3)

• Entanglement of identical particles and reference phase uncertainty
• Remote preparation of arbitrary ensembles and quantum bit commitment
• Security Trade-offs in Ancilla-Free Quantum Bit Commitment in the Presence of Superselection Rules