School of Electronic and Communication Engineering, Guiyang University, Guiyang, Guizhou, 550005, China.
Sci Rep. 2017 Mar 24;7(1):405. doi: 10.1038/s41598-017-00544-7.
An obstacle for precision improvement in quantum metrology is the information loss causing by the unavoidable interaction between probe system and environment. Quantum fluctuations are environment no system can be isolated from and it will make the precision of initial parameter estimation of the probe atom decrease with time. After the typical time of the spontaneous decay of the probe atom, the precision is greatly damaged. However, quantum fluctuations can be modified. Our results show that if we put several ancillary atoms beside the probe atom in symmetrical arrangement, the probe atom will be affected by the ancillary atoms indirectly and the information loss of the probe atom causing by the quantum fluctuations will be partially avoided. We find that the retained precision after long time evolution can approaches to [Formula: see text] times of the initial precision in condition that the probe atom and three ancillary atoms are located in the vertex of regular tetrahedron.
量子计量学精度提高的一个障碍是探针系统与环境之间不可避免的相互作用导致的信息丢失。量子涨落是环境，没有系统可以与之隔离，它会使探针原子初始参数估计的精度随时间降低。在探针原子自发衰变的典型时间之后，精度会受到很大的损害。然而，量子涨落是可以被修正的。我们的结果表明，如果我们在探针原子的旁边以对称的方式放置几个辅助原子，探针原子将间接地受到辅助原子的影响，并且探针原子由于量子涨落而导致的信息丢失将部分避免。我们发现，在探针原子和三个辅助原子位于正四面体顶点的情况下，经过长时间的演化后保留的精度可以接近初始精度的[Formula: see text]倍。
