@article{oai:repo.qst.go.jp:00047739,
 author = {Grezes, Cécile and Kubo, Yuimaru and Julsgaard, Brian and Umeda, Takahide and Isoya, Junichi and Sumiya, Hitoshi and Abe, Hiroshi and Onoda, Shinobu and Oshima, Takeshi and Nakamura, Kazuo and Diniz, Igor and Auffeves, Alexia and Jacques, Vincent and Roch, Jean-François and Vion, Denis and Daniel, Esteve and Moelmer, Klaus and Bertet, Patrice and 阿部 浩之 and 小野田 忍 and 大島 武},
 issue = {7},
 journal = {Comptes Rendus Physique},
 month = {Jul},
 note = {This article reviews efforts to build a new type of quantum device, which combines an ensemble of electronic spins with long coherence times, and a small-scale superconducting quantum processor. The goal is to store over long times arbitrary qubit states in orthogonal collective modes of the spin-ensemble, and to retrieve them on-demand. We first present the protocol devised for such a multi-mode quantum memory. We then describe a series of experimental results using NV (as in nitrogen vacancy) center spins in diamond, which demonstrate its main building blocks: the transfer of arbitrary quantum states from a qubit into the spin ensemble, and the multi-mode retrieval of classical microwave pulses down to the single-photon level with a Hahn-echo like sequence. Areset of the spin memory is implemented in-between two successive sequences using optical repumping of the spins.},
 pages = {693--704},
 title = {Towards a spin-ensemble quantum memory for superconducting qubits},
 volume = {17},
 year = {2016}
}