Quantum memories are a candidate to create quantum networks over long distances. This quantum memory is required to have long storage times, to allow for quantum repeater protocols to function over long distances, and to be highly multimode, allowing for increased speed of the quantum repeater. The Lanthanides, more commonly referred to as the “rare-earths”, are a group of metals that show great promise in creating quantum memories with the characteristics required for quantum repeaters. The quantum repeaters and memories group at the University of Geneva has been working on various rare-earth-doped crystals as prospective quantum memories. The ytterbium-doped quantum memory used in our group is one of the top candidates that has been found for temporal multiplexing storage protocols. The ytterbium-doped memory crystal has characteristics that give it both long storage times and high multiplexing potential, something few other quantum memories currently have been able to demonstrate. During my time studying at the University of Geneva, I have helped to demonstrate this memory’s capabilities through the implementation and upgrades of various experimental apparatus. We have come up with a new frequency-agile laser setup to shape our memory for the atomic frequency comb (AFC) memory protocol. This has allowed us to store 10’000 time-bin modes with a storage time of 125 μs over a spectral bandwidth of 250 MHz. This result has been conducted at the single-photon level and through a metropolitan fibre network. With the microwave resonator that we have designed allowing us to employ an AFC spin-wave protocol, we can push memory storage time to the millisecond level without affecting its multimode capacity. This brings us closer to the attributes needed for the deployment of quantum memories for the quantum internet to start taking root.