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Thesis & Accreditation
Friday, April 11th, 2014 at 11:00
Room: D102 - Institut Galilée
Patrice Bertet
Quantronics group
91191 Gif-sur-Yvette - France

A quantum memory at microwave frequencies, able to store the state of multiple superconducting qubits over long times, is a desirable device in many quantum information protocols. Spins in crystals are ideally suited for implementing this idea, because of their long coherence times, and of their intrinsic multi-mode character. I will discuss our efforts towards the implementation of a spin-ensemble based quantum memory, using NV centers in diamond. First I will describe the quantum memory protocol that we have proposed [1]. I will then show that it is indeed possible to store a superconducting qubit state in a collective state of approximately 1011 NV centers [2]. I will finally describe our efforts to implement spin-echo-type pulse sequences that should enable us to extend the storage time of the NV ensemble by orders of magnitude [3].

[1] B. Julsgaard et al., PRL 110, 250503 (2013)
[2] Y. Kubo et al., PRL 107, 220501 (2011)
[3] C. Grezes et al., to appear in PRX (2014)

Towards a spin-ensemble quantum memory for superconducting qubits

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