Physics – Quantum Physics
Scientific paper
2003-01-17
Phy. Rev. A 68, 044303 (2003)
Physics
Quantum Physics
4 pages, 1 figure, adding some analyse for security proof, to be appear in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.68.044303
Here we analyze the practical implication of the existing quantum data hiding protocol with Bell states produced with optical downconverter. We show that the uncertainty for the producing of the Bell states with spontaneous parameter down-conversion should be taken into account, because it will cause serious trouble to the hider encoding procedure. A set of extended Bell states and a generalized Bell states analyzer are proposed to describe and analyze the possible states of two photons distributing in two paths. Then we present a method to integrate the above uncertainty of Bell states preparation into the dating hiding procedure, when we encode the secret with the set of extended Bell states. These modifications greatly simplify the hider's encoding operations, and thus paves the way for the implementation of quantum data hiding with present-day quantum optics.
Guo Guang-Can
Guo Guo-Ping
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