The quest for the qubit continues

Sensitive, compact systems capable of reading quantum states will be crucial to industry’s transition to quantum computing. Researchers from INAC and Leti have already demonstrated the world’s first FDSOI qubit (quantum bit) device made on a 300 mm CMOS fab line. Now, they have also shown that low-temperature reflectometry can be used to read a qubit.
Using reflectometry to read a qubit’s quantum state is not new. However, the technique had never been implemented in an integrated circuit—until now! Screen-grid field-effect transistors were used as radiofrequency resonators integrated into the qubit architecture. Using RF reflectometry to measure the resonance frequencies turned out to be a way to read a qubit fast with an integrated silicon-based system.

Contact: xavier.jehl@cea.fr

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