Journal
COMPTES RENDUS PHYSIQUE
Volume 17, Issue 7, Pages 693-704Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crhy.2016.07.006
Keywords
Quantum memory; Superconducting qubits; NV centers in diamond; Spin qubits
Funding
- French National Research Agency (ANR)
- European project SCALEQIT
- C'Nano IdF project QUANTROCRYO
- JST
- JSPS KAKENHI [26246001]
- JSPS
- Villum Foundation
- QINVC project
- QIPSE project
- Villum Fonden [00007335] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [26246001] Funding Source: KAKEN
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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. (C) 2016 Published by Elsevier Masson SAS on behalf of Academie des sciences.
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