PhD On The Modelling Of Silicon And Germanium Spin Qubits

A totally funded PhD place is open at CEA Grenoble on the modelling of silicon and germanium spin qubits (beginning date: September/October 2023).

Silicon and preis germanium spin qubits have made excellent progress prior to now two years [1, 2]. In these devices, the elementary information is saved as a coherent superposition of the spin states of an electron or hole in a Si/SiO$_2$ or SiGe heterostructure. These spins could be manipulated electrically owing to spin-orbit coupling, and are entangled through alternate interactions, allowing for a variety of one- and two-qubit gates required for quantum computing and simulation. Grenoble, one of many main scientific cities in France, is promoting unique spin qubit platforms primarily based on Si and Ge, and holds varied records in spin lifetimes [three] and spin-photon interactions [4].

At CEA/IRIG, we support the progress of those quantum applied sciences with state-of-the-art modelling [3, four]. Specifically, we are developing the TB_Sim code, able to describe very practical qubit buildings right down to the atomic scale if wanted. The aim of this PhD is to model the quantum dynamics of single and coupled Si/Ge spin qubits in relation with ongoing experiments, using a mix of analytical and numerical (TB_Sim) methods. The undertaking will handle spin manipulation and entanglement in arrays of spin qubits, the response to noise and disorder (decoherence), and the interactions with photons (circuit quantum electrodynamics). The PhD candidate could have the chance to interact with a lively neighborhood of experimentalists engaged on spin qubits at CEA and CNRS. This PhD is anticipated to start in September/October 2023 and is fully funded by a grant from the french ANR.

To apply, ship a CV to yniquet@cea.fr.

References:

[1] A four-qubit germanium quantum processor, N. W. Hendrickx et al., Nature 591, 580 (2021).

[2] Common management of a six-qubit quantum processor in silicon, S. G. J. Philips et al., Nature 609, 919 (2022).

[Three] A single gap spin with enhanced coherence in natural silicon, N. Piot, …, Y.M. Niquet et al., Nature Nano 17, 1072 (2022).

[4] Strong coupling between a photon and a gap spin in silicon, C. X. Yu, …, Y.M. Niquet et al., Nature Nano (2023) [arXiv:2206.14082].