SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 54: Quantum Coherence and Quantum Information Systems II

TT 54.7: Talk

Thursday, March 30, 2023, 16:45–17:00, HSZ 304

Qubit reset using frequency modulation by AC Stark effect — •Jami Rönkkö, Vasilii Sevriuk, Antti Vepsäläinen, and Fabian Marxer — IQM Quantum Computers, Espoo, Finland

We present a theory for an unconditional reset scheme utilizing qubit's frequency modulation by AC Stark effect and a coupled lossy resonator. In AC Stark effect, off-resonant microwave drive shifts the frequency of a qubit without causing strong Rabi oscillations. Modulating the frequency of this drive creates sidebands around the qubit frequency. By setting the modulation frequency equal to the difference between the qubit and resonator frequencies, one of the sidebands becomes resonant with the resonator frequency. This leads to the transfer of the qubit excitation to the lossy resonator, resulting in a qubit reset. With typical parameters, the reset is achieved in only tens of nanoseconds