siliconworld

Silicon World

6 Months ago
Low-frequency spin qubit energy splitting noise in highly purified 28Si/SiGe

Low-frequency spin qubit energy splitting noise in highly purified 28Si/SiGe

We identify the dominant source for low-frequency spin qubit splitting noise in a highly isotopically-purified silicon device with an embedded nanomagnet and a spin echo decay time $${T}_{2}^{, ext{echo}}$$ = 128 µs. The power spectral density (PSD) of the charge noise explains both, the clear transition from a 1/f2- to a 1/f-dependence of the splitting noise PSD as well as the experimental observation of a decreasing time-ensemble spin d..

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