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Chinese Physics

Measurement of the decoherence of a mesoscopic superposition of motional states of a trapped ion

Zheng Shi-Biao

Published Sep 28, 2004• 4 citations
Publisher

Abstract

We propose a scheme to observe the decoherence of a mesoscopic superposition of two coherent states in the motion of a trapped ion. In the scheme the ion is excited by two perpendicular lasers tuned to the ion transition. The decoherence is revealed by the decrease of the correlation between two successive measurements of the internal state of the ion after relevant laser–ion interaction.

DOI
10.1088/1009-1963/13/10/023

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A scheme is proposed for preparing superpositions of many equidistant coherent states on a circle for the motion of an ion in an anisotropic two-dimensional trap, in which the ion is tightly bound in the y direction. In the scheme the ion is excited by one laser field in the x direction and then by two laser fields propagating along the x and y directions alternately many times. Then a state-selective measurement on the ion is made, which collapses the vibrational motion to a coherent state superposition.