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Acta Physica Sinica

Physical realization of single qubit gate using laser-two-level-atom system

Ming-Lun Chen, Shun-Jin Wang, (1)四川大学物理系,成都 610064; (2)四川大学物理系,成都 610064;兰州重离子加速器国家实验室核理论中心,兰州 730000

Published Jan 1, 2006• 5 citations
Publisher

Abstract

The time dependent Schrdinger Equation of a laser-two-level-atom system has been solved by algebraic dynamics method. The exact analytical solution is obtained, and the single qubit logical gate can be realized through adjusting the amplitude and frequency of the single mode laser field as well as strength of the short pulse laser field.

DOI
10.7498/aps.55.4638

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The time dependent Schrdinger Equation of a laser-two-level-atom system has been solved by algebraic dynamics method. The exact analytical solution is obtained, and the single qubit logical gate can be realized through adjusting the amplitude and frequency of the single mode laser field as well as strength of the short pulse laser field.
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We investigate an anisotropic Heisenberg spin cluster with five particles controlled by a time-dependent magnetic field. With the algebraic dynamical method, we obtain the exact analytical solution to the time dependent Schrödinger equation. Based on the analytical solution, it is shown that the system can be used as a universal single qubit logic gate controlled by the strength and frequency of the magnetic field, and the six special single qubit logic gates can be realized physically. We also discuss the anti-decoherence property of the qubit and its logic gates resulted from particle coupling effect and collectivity of the cluster.
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