量子几何相位在量子计算机中的应用

Quantum Computer and Geometric Quantum Phase

量子计算机具有比经典计算机更为强大的计算能力.而实现量子计算机的关键之一是使用量子几何相位来实现高保真度的普适量子逻辑门.文章先简要介绍量子计算机的基本原理和它的实现所存在的困难以及所采用的方案,然后重点讨论与实现量子计算机方案有关如核磁共振、腔量子电动力学(C-ED)和超导约瑟夫森隧结中的量子几何相位.

Quantum computers may possess much greater computing power than classical computers. But it is one of key step for implementation of quantum computer to use geometric quantum phase to realize high-fidelity universal quantum gates, and its characteristic is to utilize global geometric features to avoid noise influence in some regions, then high-fidelity quantum gates are realized. In this paper, first we briefly introduce both fundamental and existing difficulties of quantum computer, finally discuss geometric quantum phase having relation with scheme such as nuclear magnetic resonance（NMS） ,cavity-QED and superconducting Josephson-junction.