Vendredi 15 mars à 14h00,
salle Rémy Lemaire, K223

Orateur : Patrice Bertet (CEA-Saclay)
"Quantum information with NV centers in diamond and superconducting qubits"


Quantum information requires quantum-mechanical systems with both long coherence times and that can be easily coupled together in order to perform quantum logic operations. NV centers are color centers in a diamond crystal, and consist of a substitutional Nitrogen atom sitting next to a Vacancy. They carry an electronic spin that has a long coherence time even at room temperature, which is naturally trapped in the diamond matrix, and can be easily readout with laser light ; as such they are interesting candidates for quantum information. However it is utterly difficult to entangle two separate NV centers. This motivates to investigate “hybrid quantum circuit” architectures in which NV centers are coupled to auxiliary systems, possibly mediating their interaction. Superconducting quantum circuits based on Josephson junctions would be ideal for that purpose.

In this talk I will briefly review the progress of quantum information processing with NV centers. I will then describe the experiments made in our group where we realize a hybrid quantum circuit with NV centers and superconducting circuits. As a proof-of-principle experiment, we stored a single microwave photon emitted by a superconducting qubit in an ensemble of 1011 NV centers, and retrieved it partially into the qubit with a fidelity of about 10%. I will discuss the potential of these systems for realizing a quantum memory with long storage time.

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