Spin lifetime and charge noise in hot silicon quantum dot qubits
classification
❄️ cond-mat.mes-hall
keywords
temperaturefindlifetimenoisequantumsiliconchargedependence
read the original abstract
We investigate the magnetic field and temperature dependence of the single-electron spin lifetime in silicon quantum dots and find a lifetime of 2.8 ms at a temperature of 1.1 K. We develop a model based on spin-valley mixing and find that Johnson noise and two-phonon processes limit relaxation at low and high temperature respectively. We also investigate the effect of temperature on charge noise and find a linear dependence up to 4 K. These results contribute to the understanding of relaxation in silicon quantum dots and are promising for qubit operation at elevated temperatures.
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