Efficient quantum memory for light

By M. Hedges, J. Longdell, Yongmin Li, Matthew J. Sellars. Nature, 2010

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Nonlinear optical signals and spectroscopy with quantum light (2016, background): “Long storage times (Longdell et al., 2005), high efficiencies (Hedges et al., 2010), and many photon qubits in each crystal (Shahriar et al., 2002) can be achieved in this limit.”
Efficient and long-lived quantum memory with cold atoms inside a ring cavity (2012, background): “5(4)% and the quantum efficiency of single-photon detectors ηspd = 62.”
Quantum storage of photonic entanglement in a crystal (2010, background): “ficiency is directly linked to the optical depth of the material [26], and can, for example, be addressed by using longer crystals [20].”
Quantum memories: emerging applications and recent advances (2015, background): “In spite of a few demonstrations of efficient solidstate [69] and atomic [70] memories, achieving high efficiency operation has always been challenging.”
Coherence time of over a second in a telecom-compatible quantum memory storage material (2016, methodology): “Alternatively, spin-pumping allows for potentially GHz-bandwidth spin-wave storage using techniques already demonstrated in rare earth systems, such as GEM [19] and drastically improves the efficiency of AFC protocols [41].”