“…Enormous advances in quantum memory have been made by developing various photon storage protocols and their physical implementations, such as electromagnetically in-duced transparency (EIT) [3,10,12], Duan-Lukin-Cirac-Zoller (DLCZ) memory [8,13,14], off-resonant Faraday interaction [15], controlled reversible inhomogeneous broadening [16,17], atomic frequency combs [18] and Raman memory [19,20]. In order to have quantum memory practicable for efficient synchronisation and physical scalability, considerable efforts have been dedicated to meet key features known as high efficiency, low noise level, large time bandwidth product (lifetime divided by pulse duration) and operating at room temperature [6].…”