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Quantum Information Processing

Precision localization of single atom via spontaneous emission in three dimensions

Zhiping Wang, Benli Yu

Published Aug 21, 2015• 9 citations
Publisher
DOI
10.1007/s11128-015-1094-x

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Abstract We investigate the three-dimensional atom localization via spontaneous emission in a four-level atomic system. It is found that the detecting probability and precision of atom localization can be significantly improved due to the interference effects induced by the vacuum radiation field and the two laser fields. More importantly, the almost 100% probability of finding an atom within a certain range can be reached when corresponding conditions are satisfied. As a result, our scheme may be helpful in a spatially selective single-qubit phase gate, entangling gates, and quantum error correction for quantum information processing.
We investigate high-precision three-dimensional (3D) atom localization in a coherently-driven, fourlevel atomic system via spontaneous emission. Space-dependent atom-field interactions allow atomic position information to be obtained by measuring spontaneous emission. By properly varying system parameters, atoms within a certain range can be localized with nearly a probability of 100% and a maximal resolution of ~ 0.04λ. This scheme may be useful for the high-precision measurement of the center-of-mass wave functions of moving atoms and in atom nanolithography.
Abstract We investigate the three-dimensional (3D) atom localization in an atomic system coupled by three coherent fields via spontaneous emission from two different decay channels. It is found that the spatial distribution and the precision of 3D atom localization are very different in two different decay channels. Interestingly, by properly varying the phase shifts of the standing-wave fields, the almost 100% probability of finding an atom in 3D space can be reached in two different decay channels. As a result, we can achieve efficient and high-precision 3D atom localization.