Tootfinder

Bayesian and geometric analyses of power spectral densities of spin qubits in Si/SiGe quantum dot devices
Yujun Choi (Virginia Tech), Hruday Mallubhotla (University of Wisconsin-Madison), Mark Friesen (University of Wisconsin-Madison), Susan N. Coppersmith (University of New South Wales), Robert Joynt (University of Wisconsin-Madison)
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Bayesian and geometric analyses of power spectral densities of spin qubits in Si/SiGe quantum dot devices
Charge noise with a power-law spectrum poses a significant challenge to high-fidelity operation of spin qubits in semiconductor devices. Recently, considerable experimental work characterized this noise using qubits as spectrometers. It apparently arises from a collection of two-level fluctuating electric dipole systems (TLS). This suggests using the data to infer the positions, orientations, and other physical characteristics of the TLS. We identify a fundamental difficulty in this program: th…