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Sujet de stage / Master 2 Internship

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Towards hybrid quantum computing: from superconducting circuits to nuclear spins

Contact: FLURIN Emmanuel, , emmanuel.flurin@cea.fr, +33 1 69 08 04 93
Summary:
The internship is part of a research project aiming at using impurities trapped in solids as quantum bits integrated as a very high fidelity memory in superconducting quantum processors.
Possibility of continuation in PhD: Oui
Deadline for application:21/03/2019

Full description:
The crystalline defects of silicon and diamond can be apprehended as naturally trapped ions in an inert crystalline environment close to vacuum. Due to their immobility and their isolation in the crystal lattice, the electronic and nuclear spins of these ions exhibit excellent coherence times, ranging from a few seconds for electrons to a few hours for nuclei. These systems are thus excellent candidates for encoding quantum information. On the other hand, superconducting circuits constitute one of the most successful technological platforms for quantum computation. Quantum bits are encoded in artificial electromagnetic oscillators, they are easily controllable and integrable. However their coherence time does not exceed a few tens of microseconds and their manufacture is not reproducible, this is one of the main barriers toward the development of processors of more than 10 qubits.

Our group, a pioneer of superconducting circuits, is engaged in a long-term research project which aims at interfacing circuits with the electronic and nuclear spin of a unique crystal defect and thus combine the robustness of natural elements with the integrability of artificial circuits. The internship is based on recent results [1,2] of our team demonstrating the coupling of superconducting circuits with a low number of spins. The goal will be first to optimize the coupling between the circuit and a single spin trapped in diamond or silicon lattice and second to successfully detect the unique microwave photon generated by the de-excitation of the electron spin. This single photon will be captured based on a superconducting qubit of the transmon type, a key element of the superconducting quantum processor, thus laying the foundations for this new architecture.

[1] A. Bienfait et al., Nature Nanotechnology (2015)
[2] A. Bienfait et al., Nature (2016)

Technics/methods used during the internship:
Methods and techniques: This experimental internship will be co-supervised by two permanent researchers who are experts in the field, together with a PhD student working on the subject. It will provide a solid introduction to superconducting quantum technologies and the physics of defects in solids, including defects optical characterization, quantum circuit design and nanofabrication as well as microwave measurement at cryogenic temperatures (10 mK).

Laboratory
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