Controlling parameter estimation precision by designing the spin environment

Abstract The artificial intervention of quantum environment is a basic task of quantum information engineering. In this paper, we investigate the dynamical behaviors of a single system coupled to a spin environment by a z–x-type interaction. We focus on studying how to enhance the precision of parameter by the pre-designed factors of the environment. The numerical simulation results show that the initial state of the environment obviously affects the dynamics of coherence of the central spin system. We find that the environment should be prepared in a block entangled state with Bell state. This option is beneficial to increasing the quantum Fisher information. Further, if the environment is dominated by higher-frequencies particles, the decoherence in noisy environment can be effectively suppressed and the precision of parameter estimation can be enhanced. PACS: 03.65.Yz; 03.67.Lx; 03.67.Pp