Detection method capable of realizing direct acquirement of image of single atom

Abstract

The invention relates to a method for acquirement an image of a single atom and especially relates to a detection method capable of realizing direct acquirement of an image of a single atom. The detection method capable of realizing direct acquirement of an image of a single atom solves the problem that during single atom imaging, detection is difficult because of strong background signals. The detection method capable of realizing direct acquirement of an image of a single atom comprises the following steps that 1, a quadrate quartz-made glass vacuum room is treated; 2, a light field part and a magnetic field part of a magneto-optical trap system are constructed; 3, a far red-detuned micro-optical dipolar trap is constructed; 4, after an exciting light is superposed with one of three light beams which are orthogonal, fluorescent lights produced by caesium atoms are collected by a lens unit, are reflected to an interference filter by a polarization beam splitter and enter into multimode fibers; and 5, the fluorescent lights produced by caesium atoms are collected by an aspherical mirror and are reflected to a camera of a charge-coupled device by a total reflective mirror forming an angle of 45 degrees with the horizontal plane; and an image of a single atom is obtained by adjustment of an imaging zone of the camera of the charge-coupled device. The detection method provided bythe invention can realize direct acquirement of an image of a single atom and can be widely utilized for the fields of control and measurement of a single atom, and quantum information.

Description

technical field

[0001] The invention relates to a method for obtaining single atom low-background imaging, in particular to a detection method for directly obtaining single atom imaging. Background technique

[0002] The control and measurement of a single atom has important application prospects in ultra-sensitive monitoring, ultra-low signal analysis, and micro-nano scale manipulation and measurement. , quantum computing and many other aspects are extremely important. As early as 1968, scientists in the former Soviet Union proposed to use lasers to trap atoms at the place with the strongest light intensity. However, due to the shallow trap depth, atoms cannot be directly captured from the background gas at room temperature (see literature V. S. Letokhov, JETP Lett . 7, 272 (1968).); In addition, it was proposed to construct a three-dimensional optical dipole trap scheme combining dipole force and scattering force based on two negatively detuned laser beams facing each oth...

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