Experimental demonstration of suppressing residual geometric dephasing

TLDR: In this article, a modified dynamic decoupling scheme was proposed to suppress residual geometric dephasing in a single trapped 171 Yb + ion with low-frequency noise, and the experimental results showed that the modified scheme can reduce the dephase rate up to more than one order of magnitude compared with traditional dynamic decouple schemes.

Abstract: The geometric phase is regarded as a promising strategy in fault tolerance quantum information processing (QIP) domain due to its phase only depending on the geometry of the path executed. However, decoherence caused by environmental noise will destroy the geometric phase. Traditional dynamic decoupling sequences can eliminate dynamic dephasing but can not reduce residual geometric dephasing, which is still vital for high-precision quantum manipulation. In this work, we experimentally demonstrate effective suppression of residual geometric dephasing with modified dynamic decoupling schemes, using a single trapped 171 Yb + ion. The experimental results show that the modified schemes can reduce dephasing rate up to more than one order of magnitude compared with traditional dynamic decoupling schemes, where residual geometric dephasing dominates. Besides, we also investigate the impact of intensity and correlation time of the low-frequency noise on coherence of the quantum system. And we confirm these methods can be used in many cases.