The accelerated expansion of the Universe is the most surprising cosmological discovery in decades. It is not predicted by the standard model of particle physics; the amplitude of the leading theoretical explanation, vacuum energy Λ , and observations differ by tens of orders of magnitude. This proposal combines two leading cosmology research groups with complementary expertise to unlock the constraining power of combining Cosmic Microwave Background (CMB) measurements and galaxy imaging surveys.

Quantum Technologies are at the forefront of current research. A significant limitation of the current technologies is the scalability of the spin carriers that feature long coherence time (superposition of states), such as single nuclei, magnetic atoms, or defects. Tailored molecules or Single Ion Magnets (SIM) are a very appealing alternative because molecular engineering shall help solve the scalability issue. Yet, efficient molecular qubits based on SIM remains rare due to fast de-coherence, which is induced by the interactions between the metallic ion and its environment.