Robust quantum random access memory
Fang-Yu Hong, Yang Xiang, Zhi-Yan Zhu, Li-zhen Jiang, Liang-neng Wu · Physical Review A · 2012
A ``bucket brigade'' architecture for a quantum random memory of $N={2}^{n}$ memory cells needs $n(n+5)/2$ times of quantum manipulation on control circuit nodes per memory call. Here we propose a scheme in which only on average $n/2$ times manipulations are required to accomplish a memory call. This scheme may significantly decrease the time spent on a memory call and the average overall error rate per memory call. A physical implementation scheme is discussed for storing an arbitrary state in a selected memory cell followed by reading it out.