Cryopenic control electronics dedicated to the control of a matrix of qubits

Published : 1 January 2023

The recent improvements of quantum bits (qubit) based on electron spins pave the way towards their massive integration into the possible quantum processor of the future quantum computer. The individual biasing, manipulation and reading of particular qubits of the matrix is a key point that forges strong links between physicists and electronics engineers. More specifically, the control of a large number of qubits needs the design of an electronics working at cryogenic temperature placed as close as possible to the matrix of qubits. In the context of quantum computing, future needs will consist in controlling thousands to one million of qubits so that big challenges are put on the control electronics in terms of power consumption, silicon area and signal integrity that could limit qubit fidelity.

The thesis goal will be to provide a solution of a fully integrated qubit control electronics fulfilling the needs in terms of power consumption and low area. The solution should be scalable to comply with the foreseen very large matrices of qubits. The proposed architecture should be optimized taking into account both the architecture of the matrix and the interconnections between the matrix and the electronics. A prototype will have to be designed using a FDSOI technology and will be tested in one of CEA fridges. A full demonstration involving the control chip and a matrix will be envisaged.

The PhD will take place in LGECA laboratory of CEA Leti which has developed an expertise in the design of cryogenic integrated circuits for quantum computing purpose. The work will be done in collaborations with technologists teams of CEA-Leti in charge of the development of matrices of qubits.

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