A millimeter magnetic trap for a dual (Rb and Rb) species atom interferometer.

We present a magnetic trap for cold atoms near a surface of a millimeter-sized atom chip. The trap allows us to capture a large number of atoms with modest electrical currents (40 A) and to generate large magnetic gradients (>300 G cm). Here we report a mixture containing 6 × 10 atoms for the two rubidium isotopes Rb and Rb.