How to read and modify a quantum bit, step by step

A team of researchers from Grenoble (IRIG, Leti, and CNRS) made headlines in 2016 with the world’s first FDSOI qubit device—based on holes rather than electrons—made on a 300 mm CMOS fab line. Now they can read the state of the qubit, too. The researchers used a screen-grid reflectometry method, applying microwave signals to the grid to modify the qubit’s state.

The read technique is still lacking in precision. However, it will be useful for the rapid characterization (coherence time, relaxation time, etc.) of qubits made in Grenoble. Plus, the technique will be easy to duplicate on future circuits made up of several qubits. The research was published in Nature Communications in an article that came shortly after another team of researchers from Grenoble published their research on gate-based high-fidelity spin readout in a CMOS qubit*.

*in Nature Nanotechnology

Contact: romain.maurand@cea.fr

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