Magnetic field device for transferring cold atoms at long distance

Abstract

The invention relates to the field of a magnetic field device for atom transfer and particularly relates to a magnetic field device for transferring cold atoms at a long distance. A pushing coil is used to generate pushing magnetic fields for transferring the cold atoms to a high vacuum chamber at the other side from a low vacuum chamber at one side; an MOT (multiplex output terminal) coil is arranged for imprisoning the cold atoms; a transfer coil is arranged for keeping the cold atoms unexpanded and keeping the volume unchanged in a process of controlling the cold atoms to transfer. According to the magnetic field device disclosed by the invention, the transferring of cold atoms is realized through a method of applying magnetic fields, so that an experimental device can be simplified to a great extent, a heating effect of atoms in the transfer process can be lowered, and the transfer efficiency can be improved. Moreover, the magnetic field device is simple in structure, convenient to operate, and of great popularization value.

Description

technical field [0001] The invention relates to the field of magnetic field devices for atom transfer, in particular to a magnetic field device for long-distance transfer of cold atoms. Background technique [0002] The invention of laser cooling technology makes it possible to trap neutral atoms in magnetic traps. In 1985, neutral atoms were successfully trapped in magnetic traps for the first time. In 1995, using the combination of laser cooling and evaporative cooling technology, alkali metal 87 A Bose-Einstein condensate (BEC for short) of Rb atoms has been observed experimentally. After the realization of BEC, the researches using BEC are rapidly carried out in many fields such as atomic and molecular physics, atomic optics, optical frequency standard and quantum information. The key to continuously obtaining Bose-Einstein condensates is to control the trapping and cooling process of atoms at the same time. In experiments, the trapping and cooling processes of atoms ...

AI Technical Summary

Problems solved by technology

[0003] The common technique uses a beam of laser that resonates with the atoms to push the atoms trapped in MOTA into MOTB, but the atoms are not bound in all directions (except the push direction) during the push process, so the atoms will expand during the push process , resulting in a decrease in the atomic density; in addition, after the atoms are pushed to the MOTB, the MOTB needs to use the method in the MOTA to trap the atoms. Experimentally, six laser beams and a pair of anti-Helmholtz coils are used to form Magneto-optical traps trap atoms

Its disadvantages are that the light source is wasted, and the space location will be very crowded, which will cause great hidden dangers for subsequent experiments.

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