Related papers: Magnetic Gradient Fluctuations from Quadrupolar $^{73}$Ge in Si/SiGe Exchange-Only Qubits

Magnetic Gradient Fluctuations from Quadrupolar $^{73}$Ge in Si/SiGe Exchange-Only Qubits

URL: http://arxiv.org/abs/2009.08079v1
Date: Thu, 17 Sep 2020 05:32:21 GMT
Title: Magnetic Gradient Fluctuations from Quadrupolar $^{73}$Ge in Si/SiGe Exchange-Only Qubits
Authors: J. Kerckhoff, B. Sun, B. H. Fong, C. Jones, A. A. Kiselev, D. W. Barnes, R. S. Noah, E. Acuna, M. Akmal, S. D. Ha, J. A. Wright, B. J. Thomas, C. A. C. Jackson, L. F. Edge, K. Eng, R. S. Ross, and T. D. Ladd
Abstract summary: We study the time-fluct magnetic gradient noise mechanisms in pairs of Si/SiGe quantum dots using exchange echo noise spectroscopy. We find that quadrupolar precession of the $73$Ge nuclei play a key role in the spin-echo decay time $T$, with a characteristic dependence on magnetic field and the width of the Si quantum well.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We study the time-fluctuating magnetic gradient noise mechanisms in pairs of Si/SiGe quantum dots using exchange echo noise spectroscopy. We find through a combination of spectral inversion and correspondence to theoretical modeling that quadrupolar precession of the $^{73}$Ge nuclei play a key role in the spin-echo decay time $T_2$, with a characteristic dependence on magnetic field and the width of the Si quantum well. The $^{73}$Ge noise peaks appear at the fundamental and first harmonic of the $^{73}$Ge Larmor resonance, superimposed over $1/f$ noise due to $^{29}$Si dipole-dipole dynamics, and are dependent on material epitaxy and applied magnetic field. These results may inform the needs of dynamical decoupling when using Si/SiGe quantum dots as qubits in quantum information processing devices.

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