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WIPM Made Progress in the Manipulation of Quantum State in Single Atoms

Author: Update time: 2014-02-24

Recently, the cold atom research group ( led by Prof. Ming-sheng Zhan ) in Wuhan Institute of Physics and Mathematics has extended Carr-Purcell-Meiboom-Gill (CPMG) sequence to single neutral atoms and demonstrated the strong suppression of phase decoherence. This result is published in Optics Express [21 (26), 32130-32140 (2013)].

Decoherence suppression in single neutral atoms is of great importance for quantum information processing and precision measurements. Quantum decoherence represents a loss of information and can be a serious limitation in precision. It is due to coupling between quantum system and its surrounding environment. In order to suppress phase decoherence, a plenty of multipulse dynamical decoupling techniques are investigated. One of these, the CPMG pulse sequence is widely used in the field of nuclear magnetic resonance and other systems. However, experimental demonstration of its effect in single neutral atoms remains unexplored. The group members Shi Yu and Peng Xu have extended CPMG sequence to single atoms and successfully observed the strong suppression effect. Utilizing CPMG sequence with pulse number n = 6, the dephasing time is prolonged by a factor of 3. In comparison with atomic ensembles, the dephasing due to atomic collisions disappears for individual atoms. Thus, CPMG suppression effect is efficient with a few pulses. This method will be useful in further experiments of quantum information processing and precision measurements.

This work was supported by the National Basic Research Program of China, the National Natural Science Foundation of China, and the Chinese Academy of Sciences.

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