基于磁共振压力显微系统的量子保真度

Quantum fidelity based on magnetic resonance force microscopy system

在不同初始态条件下,基于磁共振压力显微系统探讨C、H两原子的量子态保真度随时间的变化。结果表明:在不同初态条件下,保真度随时间的演化曲线不同。悬臂偏移量引起的磁场偏差以及自旋与射频磁场的相互作用使得保真度的周期大大缩短,从而可以在更短的时间间隔内使量子信息恢复到最原始的初态。同时射频磁场可以使量子信息在传播过程中接近理想状态。研究为探测样品中的原子状态以及提高量子信息在传递过程中的准确率提供了一定的保证。

Under different initial states, the time evolution of quantum state fidelity of C atom and H atom was discussed based on magnetic resonance force microscopy （MRFM） system. The results show that the time evolution curve of fidelity is different under the different conditions of initial states. Both deviation of the magnetic field due to the cantilever offset and interaction of spins and RF magnetic field make the period of fidelity decrease greatly. Cpnsequently the quantum information can return its initial state in a short time interval. At the same time the RF magnetic field can make the quantum information approach ideal states in the transmission process that provides particular guidance for detecting atomic states in the sample and improving the accuracy of information in transmission process.