An atom chip for an ultracold-atom sensor, the chip includes an XY-plane normal to a Z-axis, the atom chip comprising: first and second coplanar waveguides suitable for propagating microwaves at respective angular frequencies ωa and ωb, the waveguides being placed symmetrically on either side of the X-axis and being referred to as X-wise guides, first and second coplanar waveguides suitable for propagating microwaves at respective angular frequencies ω′a and ω′b, the waveguides being placed symmetrically on either side of an axis the projection of which in the XY-plane is along an axis Y′ that is different from the X-axis and that is contained in the XY-plane, and being referred to as Y′-wise guides, the X-wise guides being electrically insulated from the Y′-wise guides, an intersection of the guides forming a parallelogram of center O defining an origin of the reference frame XYZ, at least a first conductive wire and a second conductive wire the respective projections of which in the XY-plane are secant at O and make between them an angle larger than or equal to 20°, the conductive wires being suitable for being passed through by DC currents.