Setup of a quantum-enhanced atomic sensor for precision metrology and tests of fundamental physics

Many-particle entangled states are not only a valuable resource for quantum information tasks and entanglement-enhanced metrology, but can also be applied as probes to test fundamental properties of nature. Across the communities of optics and atomic and molecular physics, major advances have been made towards the creation of entangled states with increasing entanglement strength and fidelity. However, in the field of ultracold atoms, the created nonclassical states are up to now mostly restricted to the two classes of squeezed states and W states. Within this project, we will employ spin-changing collisions in a Rb Bose-Einstein condensate to experimentally generate new classes of highly nonclassical many-particle states, including high-fidelity multi-particle Fock states, particle-added and particle-subtracted states, and Schrödinger cat states. We will demonstrate multi-mode entanglement and non-local entanglement by devising entangled quantum states with spatial separation. We will explore possible application scenarios for using these highly sensitive states for precision metrology with atom interferometers.