量子信息的几率删除

Probabilistic Erasing of Quantum Information

通过一个幺正变换U和一个测量过程M ,对于从一个量子态集合 { |ψ1〉 ,|ψ2 〉}中随机选出的两个非正交态 ,实现几率删除的方案。比较了量子删除和量子克隆物理过程的差异及其效率。

According to the superposition principle of quantum states,an arbitrary quantum state can not be deterministically erased(Pati & Braunstein),but may be probabilistically erased.Similar to the probabilistic cloning of quantum states by Duan & Guo,in this paper a probabilistic erasing scheme is developed,i.e.,two non-orthogonal states secretly chosen from a certain set {|ψ 1〉,|ψ 2〉} can be probabilistically erased through a unitary transformation U in combination with a subsequent measurement M.The differences in characters and efficiencies between probabilistic cloning and erasing are discussed.