Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PostDocs : selection by topics

Technological challenges >> New computing paradigms, circuits and technologies, incl. quantum
2 proposition(s).

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Simulation and electrical characterization of an innovative logic/memory CUBE for In-Memory-Computing

Département Composants Silicium (LETI)

Laboratoire d'Intégration des Composants pour la Logique

01-01-2020

PsD-DRT-20-0029

francois.andrieu@cea.fr

For integrated circuits to be able to leverage the future ?data deluge? coming from the cloud and cyber-physical systems, the historical scaling of Complementary-Metal-Oxide-Semiconductor (CMOS) devices is no longer the corner stone. At system-level, computing performance is now strongly power-limited and the main part of this power budget is consumed by data transfers between logic and memory circuit blocks in widespread Von-Neumann design architectures. An emerging computing paradigm solution overcoming this ?memory wall? consists in processing the information in-situ, owing to In-Memory-Computing (IMC). However, today's existing memory technologies are ineffective to In-Memory compute billions of data items. Things will change with the emergence of three key enabling technologies, under development at CEA-LETI: non-volatile resistive memory, new energy-efficient nanowire transistors and 3D-monolithic integration. At LETI, we will leverage the aforementioned emerging technologies towards a functionality-enhanced system with a tight entangling of logic and memory. The post-doc will perform electrical characterizations of CMOS transistors and Resistive RAMs in order to calibrate models and run TCAD/spice simulations to drive the technology developments and enable the circuit designs.

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Inductors for quantum reflectometry

Département Composants Silicium (LETI)

Laboratoire Composants Radiofréquences

01-04-2020

PsD-DRT-20-0039

jean-philippe.michel@cea.fr

Quantum computing is nowadays a strong field of research at CEA-LETI and in numerous institutes and companies around the world. Reflectometry is one of the major avenues envisaged for Qubits reading. Reflectometry and frequency multiplexing techniques requires many small resonators that must be positioned as close to the quantum chip as possible. First demonstrations performed with discrete inductors showed limitations in terms of size and coupling. Large-scale passives component integration technologies mastered at CEA-LETI can meet these dimensional constraints. Especially, CEA-LETI is positioned at the highest level of the state of the art in magnetic inductors on silicon, with record inductance densities (> 3 000 nH/mm²). First measurements have already validated the operation of the technology at very low temperature. We now have to demonstrate the feasibility of an inductive interposer dedicated to Qubits reading by leveraging high inductance densities. The student will perform the accurate RF characterization of our magnetic inductors at cryogenic temperature. He will analyze the obtained results to describe the electrical and magnetic behaviour of the components. The bibliographic analysis and the studies already carried out will enable him to define a new technological stack combining the advantages of magnetic materials and superconductors. He will propose suitable designs to realize high quality factor inductors and an inductive interposer for Quantum reflectometry.

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