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Magnetic Gradient Fluctuations from Quadrupolar $^{73}$Ge in Si/SiGe Exchange-Only Qubits
- Source :
- PRX Quantum 2, 010347 (2021)
- Publication Year :
- 2020
-
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.<br />Comment: 17 pages, 11 figures
- Subjects :
- Quantum Physics
Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- PRX Quantum 2, 010347 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2009.08079
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PRXQuantum.2.010347