Towards a spin-ensemble quantum memory for superconducting qubits

Cécile Grezesa, Yuimaru Kuboa, Brian Julsgaard, Takahide Umeda, Junichi Isoya, Hitoshi Sumiya, Hiroshi Abe, Shinobu Onoda, Takeshi Ohshima, Kazuo Nakamura, Igor Diniz, Alexia Auffeves, Vincent Jacques, Jean-François Roch, Denis Vion, Daniel Esteve, Klaus Mølmer, Patrice Bertet

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review


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. A reset of the spin memory is implemented in-between two successive sequences using optical repumping of the spins.

Original languageEnglish
JournalComptes Rendus Physique
Pages (from-to)693–704
Number of pages12
Publication statusPublished - 2016


  • NV centers in diamond
  • Quantum memory
  • Spin qubits
  • Superconducting qubits


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