QUANTUM STATE GENERATION METHOD, CENTER DEVICE FOR GENERATING QUANTUM STATE AND QUANTUM STATE GENERATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To generate a quantum state corresponding to secret information without the whole of the secret information is known by any center device in quantum communication.;SOLUTION: In each of n pieces of center devices, each secret value σ_j is generated and its distributed value is dispersedly distributed to other center devices. Next, each center device calculates a complement value K^[j] by a Lagrangian complement formula, etc. Then, a center device P₁ generates a quantum state |_ψ^[1] corresponding to its complement value K^[1] and transmits it to a center device P₂. A center device P_S (note that s is one term of a set {2, ..., t} and n≤t) repeats processing for performing unitary conversion corresponding to its complement value K^[S] and transmitting the quantum state |_ψ^[S] which is its result to a quantum state |_ψ^[S] received from a center device P_S-1. Then, a unitary conversion result in a center device P_t is considered as the quantum state to the whole secret information K.;COPYRIGHT: (C)2006,JPO&NCIPI