[Vers une mémoire quantique à ensemble de spins pour qubits supraconducteurs]
Cet article porte sur la réalisation d'un nouveau type de dispositif quantique, dans lequel un ensemble de spins électroniques avec des temps de cohérence longs est associé à un processeur quantique supraconducteur à quelques qubits. Le but est de stocker les états des qubits dans les degrés de liberté collectifs de l'ensemble de spins, et de les récupérer à la demande, bénéficiant ainsi d'une meilleure protection contre la décohérence. En première partie, nous présentons le protocole mis au point pour une telle mémoire quantique multi-mode. Nous décrivons ensuite une série de résultats expérimentaux utilisant des centres NV dans le diamant, démontrant les briques de base de ce protocole : le transfert d'états quantiques arbitraires d'un qubit vers l'ensemble de spins, et la récupération de champs micro-ondes classiques au niveau du photon unique par application d'une séquence de refocalisation de type écho de Hahn. La réinitialisation de la mémoire entre deux séquences successives est réalisée par repompage optique des spins.
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.
Mot clés : Mémoire quantique, Qubits supraconducteurs, Centres NV du diamant, Qubits de spin
@article{CRPHYS_2016__17_7_693_0,
author = {C\'ecile Grezes and Yuimaru Kubo and Brian Julsgaard and Takahide Umeda and Junichi Isoya and Hitoshi Sumiya and Hiroshi Abe and Shinobu Onoda and Takeshi Ohshima and Kazuo Nakamura and Igor Diniz and Alexia Auffeves and Vincent Jacques and Jean-Fran\c{c}ois Roch and Denis Vion and Daniel Esteve and Klaus Moelmer and Patrice Bertet},
title = {Towards a spin-ensemble quantum memory for superconducting qubits},
journal = {Comptes Rendus. Physique},
pages = {693--704},
publisher = {Elsevier},
volume = {17},
number = {7},
year = {2016},
doi = {10.1016/j.crhy.2016.07.006},
language = {en},
}
TY - JOUR AU - Cécile Grezes AU - Yuimaru Kubo AU - Brian Julsgaard AU - Takahide Umeda AU - Junichi Isoya AU - Hitoshi Sumiya AU - Hiroshi Abe AU - Shinobu Onoda AU - Takeshi Ohshima AU - Kazuo Nakamura AU - Igor Diniz AU - Alexia Auffeves AU - Vincent Jacques AU - Jean-François Roch AU - Denis Vion AU - Daniel Esteve AU - Klaus Moelmer AU - Patrice Bertet TI - Towards a spin-ensemble quantum memory for superconducting qubits JO - Comptes Rendus. Physique PY - 2016 SP - 693 EP - 704 VL - 17 IS - 7 PB - Elsevier DO - 10.1016/j.crhy.2016.07.006 LA - en ID - CRPHYS_2016__17_7_693_0 ER -
%0 Journal Article %A Cécile Grezes %A Yuimaru Kubo %A Brian Julsgaard %A Takahide Umeda %A Junichi Isoya %A Hitoshi Sumiya %A Hiroshi Abe %A Shinobu Onoda %A Takeshi Ohshima %A Kazuo Nakamura %A Igor Diniz %A Alexia Auffeves %A Vincent Jacques %A Jean-François Roch %A Denis Vion %A Daniel Esteve %A Klaus Moelmer %A Patrice Bertet %T Towards a spin-ensemble quantum memory for superconducting qubits %J Comptes Rendus. Physique %D 2016 %P 693-704 %V 17 %N 7 %I Elsevier %R 10.1016/j.crhy.2016.07.006 %G en %F CRPHYS_2016__17_7_693_0
Cécile Grezes; Yuimaru Kubo; 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 Moelmer; Patrice Bertet. Towards a spin-ensemble quantum memory for superconducting qubits. Comptes Rendus. Physique, Volume 17 (2016) no. 7, pp. 693-704. doi : 10.1016/j.crhy.2016.07.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.07.006/
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