Low-frequency spin qubit energy splitting noise in highly purified 28Si/SiGe
Low-frequency spin qubit energy splitting noise in highly purified 28Si/SiGe
Abstract 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 $${T}_{2}^{\,\text{echo}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mspace /> <mml:mi>echo</mml:mi> </mml:mrow> </mml:msubsup> </mml:math> = 128 µs. The power …