,Direct loading of atoms from a macroscopic quadrupole magnetic trap into a microchip trap

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We demonstrate the direct loading of cold atoms into a microchip 2-mm Z-trap,where the evaporative cooling can be performed efficiently,from a macroscopic quadrupole magnetic trap with a high loading efficiency.The macroscopic quadrupole magnetic trap potential is designed to be moveable by controlling the currents of the two pairs of anti-Helmholtz coils.The cold atoms are initially prepared in a standard six-beam magneto-optical trap and loaded into the macroscopic quadrupole magnetic trap,and then transported to the atom chip surface by moving the macroscopic trap potential.By means of a three-dimensional absorption imaging system,we are able to optimize the position alignment of the atom cloud in the macroscopic trap and the microchip Z-shaped wire.Consequently,with a proper magnetic transfer scheme,we load the cold atoms into the microchip Z-trap directly and efficiently.The loading efficiency is measured to be about 50%.This approach can be used to generate appropriate ultracold atoms sources,for example,for a magnetically guided atom interferometer based on atom chip.
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