Energy-Time Entanglement between a Photon and a Spin-Wave in a Multimode Solid-State Quantum Memory

Light-matter entanglement is an important resource in quantum information science. It enables complementing the advantages of using photons as flying qubits in quantum communication schemes, with those of matter qubits, which are ideal for quantum storage and processing. A very convenient method to directly generate light-matter entanglement in atomic ensembles is the Duan-Lukin-Cirac-Zoller (DLCZ) protocol [1].