A bilayer system of dipolar atoms on a 50 nm scale

We implement a new super-resolution technique which arranges magnetic atoms on a sub-50 nm scale --- a scale on which the interatomic dipole-dipole interaction is greatly enhanced. We demonstrate the technique by creating a bilayer system of ultracold dysprosium atoms with tunable interlayer distances. The dipolar interaction between the two layers is observed via the interlayer sympathic cooling and the coupled collective excitations. This technique can be generalized to optical tweezers, and should enable quantum gates driven by magnetic dipole-dipole interactions.